MAAS 50 Amplifier repair tips, and their unique story. Mr Carlson's Lab electronics course is here: / mrcarlsonslab
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@RobertsAutomotive Жыл бұрын
Maas Rowe Carillons Is the company and they turned 100 years old this year. My father worked there his entire working career, met my mom there, and I got my first job there as well, tuning chime tubes... Thanks for the cool videos, you earned another sub!
@markj40663 жыл бұрын
As a former broadcast engineer this was a walk back in history for me. Very well done and appreciated.
@mikesradiorepair7 жыл бұрын
I love working on old tube amplifiers. Can't beat the make it simple stupid design. One thing I would note when replacing power cords is watch polarity. Modern power cords and outlets are polarized. As you are aware some radios and TV's ran a hot chassis. Back in the day you had a 50-50 chance when plugging in something that you could be attaching the chassis to neutral or hot. When replacing the cord always be sure the neutral side of the cord is attached to the neutral side of the cord. Just thought I would mention that for the viewers.
@petroldevo99345 жыл бұрын
Good point ! I lived in this dumpy apartment years ago and had friends over all the time. One day I went to wash my hands and grab a beer from the fridge well aparently touching the metal fridge door handle and the sink faucet were neutral/hot. One friend found out the hard way getting a beer even after the warning.
@electrolyticmaster83965 жыл бұрын
I destroyed a TV back in the sixties .. because of polarity reversal.
@PeopleAlreadyDidThis6 жыл бұрын
Just found your channel, subscribed. I love tube equipment. In 1973, aged 13, I built a preamp and power amp from the schematics in the 1963 RCA Receiving Tube Manual. Remarkably, it worked “out of the box.” Still have it! I learned that much of the spacious component placement came from following the recommended tube spacing distances in the power amp. Commercial amps often crowded the tubes to save cost. I also learned about touching 250V B+ circuits when I slipped one day. Never again. The output transformer cost $60 back then at the local supply house. It weighs as much as a small anvil. Wish I had a box full of them.
@electricboyo4 ай бұрын
When I was in high school a friend of my parents who was a ham radio operator gave me a RCA receiving tube manual and an ARRL ham radio handbook. Over time I read them from cover to cover. Plenty of these old books are still around and well worth having for everyone who is interested in vacuum tube circuitry. Also many have been scanned and can be downloaded for free.
@steelcity321pb67 жыл бұрын
It will be an immense honour to be given a tour round your Broadcast transmitters. Another informative, and very well crafted video: thank you Paul. Phil.
@MrCarlsonsLab7 жыл бұрын
Thanks for your input Phil!
@johns99187 жыл бұрын
I agree. I was a broadcast engineer back in the early '60s.
@foolscrowstudio7 жыл бұрын
i love all your videos, i listen to em when im teching, as a self taught tech, Ive come to find Im most impressed by gear that has lasted the longest in service without needing repair even over performance and "specs" , which really comes down to craftsmanship and engineering over cost-cutting or the latest trends.
@SuEnRoD7 жыл бұрын
Thank you for this video. You brought back a memory/question from my youth (54 now) that I never answered. I remember thinking our church bell sounded the same EVERY Sunday but never knew why. Now it makes sense. Carillon amplifier. Now I know.
@Dzonemp7 жыл бұрын
I started out working on tube TVs when I was a Kid. My Mom had found some how to books from the 50's and I used them to help me repair TVs. The problem with that is every time I turned around somebody wanted to give their old broken TV. I quickly ran out of room for them, but I did get pretty good at cannibalizing parts to repair other TVs. Thanks for the great video!
@MrXapheth2 жыл бұрын
My knowledge about electronics is absolutely nothing! But watching this channel I learn a lot! Awesome channel!
@TheRudydog15 жыл бұрын
To all who follow Mr Carlson's videos this man really knows his electronics, both vacuum tube and solid state! I recently acquired a very clean Maas Power Amplifier so I especially enjoyed the history on this amplifier. I was also surprised to find so few components in the Maas but sometimes simple on an audio amplifier means less to get in the way of the amplified signals.
@alexandermarhefka18874 жыл бұрын
Doing repair and restauration work on vintage tube gear since more than four decades I endorse everything said and demonstrated in this excellent educational video! IMHO only one minor aspect was not mentioned and this is the deterioration of carbon (composite) resistors over time. The higher the value, especially above appr. 100kOhm, and the higher the voltage drop over these resistors, the more likely their value has increased above the usual 10% tolerance range. Deviations of more than 100% are no rarity. Recently I was called to a Hammond E-100 (mfd. around 1965) with a weak vibrato channel. The plate resistor of an EF86/6CF8 had changed its value from nominal 220kOhm to 1.4MOhm! So I usually check all resistors if I have older gear on the bench for restauration. Only inductors seem to be quite stable over decades, but capacitors and resistors are definitely prone to leakage and value changes with time. Keep on making your splendid teaching videos, Paul. You have universal knowlegde and experience and great teaching abilities! Even for an old hand like me It is great pleasure to watch your stuff (e.g. the Yaesu FT-1000 rep&mod) and to learn about some details. Best regards Alex
@keithlincicum36915 жыл бұрын
Great, informative video Mr.C. I have a vacuum tube amp. that I built as a Knight Kit KG 240. In 9th grade I had finished my assigned wood shop projects, so the teacher allowed me to design my own with 2 months left. All mom had to play her records on was a dirt-cheap Wards plastic portable. Dad got Allied catalogs and in the sale insert they offered an amp kit, 2- 8" speakers and a record changer for I think $59.99. I first showed it to mom, and she then to dad. The battle was on. Money wasn't a factor, but his lack of faith in me was well versed. He caved to my surprise and we sent off for it. Mr. Symington entered it in the Spokane Amateur Woodworkers fair and I won 5th place. I was never so careful assembling anything as that amp because I knew I'd never hear the end of it if I made a mistake. I finished it while they were out shopping, and when they came in the house I had the amp, speakers and changer laid out on my bed blasting away with one of mom's favorite records. She was all smiles but the old man...... When it was all together she enjoyed it for many years. Now I have severe non-military PTSD so it's very difficult to follow your tips. But I'd like to see the 240 glow and make music again after 53 years. Thanks and take care, Keith L.
@johnnytacokleinschmidt5152 жыл бұрын
Great story. You did a really nice thing and have a great memory for it. Dads were quite stoic back then... You're the adult now. It's up to you. God Bless!
@rameshbabu19636 жыл бұрын
sir, when comes to vintage electronic stuff you are the master your narration touches the history as well .. thats amazing
@MrCarlsonsLab6 жыл бұрын
Thanks for your kind comment!
@redemptusrenatus53367 жыл бұрын
Tiny Grief capacitors... I love it! Reminds me of Windows when Microsoft came out with it's new "Plug and Play" technology and we'd call it, "Plug and Pray" instead :P
@MrCarlsonsLab7 жыл бұрын
LOL!
@rimmersbryggeri7 жыл бұрын
Microsoft used to work together with Ericsson so when Ericsson announced their Bluetooth technology Microsoft were fast to counter it with their Blue-Screen technology.
@faxcapper7 жыл бұрын
I was in New York's Time Square about 10 years ago and one of the huge video screen had a massive BSOD Blue Screen Of Death. Wonderful adverting for Microsoft. :-)
@bekiil7 жыл бұрын
hehe, yeah I remember that. ISDN was "troublesome" 😅
@ed731pdh7 жыл бұрын
ISDN - "I Scramble Data Nausiatingly". :)
@mangentle76183 жыл бұрын
I am a newbie for building tube amplifier. It is extremely hard to find good tutorials/ references in the Asian world even i am in Hong Kong. Thank you for your kind and superior explanation Mr. Carlson, and I clicked "confirm to join" on Patreon of course. Let's get started!
@ianbutler19837 жыл бұрын
"I have a couple of broadcast transmitters..." Now there is a phrase you don't hear on many youtube channels. Thanks Paul, yours is my favorite channel.
@MrCarlsonsLab7 жыл бұрын
Thanks Ian! I'm glad you're enjoying the channel!
@h3tv7 жыл бұрын
Thank you Paul, I have watched numerous vids you have done on tube radios and amplifiers and tube test equipment and how to bring them back to ;their former glory or better. It has helped me as I have recently brought back to life an approx. 1936-38 Silvertone / Mission Bell 41AW radio that I bought at a Saturday night farmers auction in 1967.
@MrCarlsonsLab7 жыл бұрын
Your welcome Ron!
@tadonplane82654 жыл бұрын
You sent me on a learning path I never expected...what’s a carillon? So I looked it up. A carillon is a percussion musical instrument consisting of at least 23 cast bronze bells, any less than that and it’s a chime. Some are played mechanically but traditional ones are played manually via a large keyboard and footboard by a carillonneur. The largest one in the world is in the Palace of Mafra in Portugal and has 120 bells. Most carillons are installed in bell towers but there are portable ones. Your MAAS 50 may have amplified pre-recorded bell music, but it may also have amplified live emulated bell music played on a keyboard. The bell sound signal was created by striking various length tuned metal rods or tubular bells via solenoid driven hammers and picked up with a mic or magnetic pickup. Often the church organ keyboard could be set to play the carillon. The German name for a carillon is a glockenspiel.
@bloguetronica6 жыл бұрын
Very insightful video! Tube technology is actually very interesting. I still have much to learn, but watching your videos gives me that opportunity. Thanks once again, Paul, for another great and well explained video!
@ViolonistaCanhoto6 жыл бұрын
I just stumbled onto this video. Fascinating, and beautifully done. Mr. Carlson, you are a gifted teacher. I'll become a patron. Thank you.
@MrCarlsonsLab6 жыл бұрын
Thanks! I look forward to seeing you there.
@SteveGunnfl7 жыл бұрын
You are a breath of much needed air - the commitment to want to do it well and do it right - something that's sadly becoming a rarity in today's disposable society.. My wife would never let me have that much test gear buy hey I can dream :) Thanks again, I like watching something that is the total opposite of "10 quick fixes". videos.
@W1RMD4 жыл бұрын
YES!!! I want to see broadcash transmitters! Excellent video. Very basic yet very informative. Also, have you noticed that the metal can crapacitors tend to last WAY longer than other types? I've NEVER had to change one. Even in 60 year old equipment. The exception being the salt and pepper shaker style copper can style in my Philco model 70. There was loose stuff inside that came out the holes on top. I just disconnected it, polished it up and put some small electrolytic craps underneath. A coat of clear coat and the copper still looks new 25+ years after restoration! 73's de w1rmd.
@guidoburgalassi15312 жыл бұрын
Ho vissuto di pane e valvole tutta la mia gioventù e ora che sono vecchio le adoro sempre e ne ho una bella collezione. Ho costruito molti amplificatori con le mitiche 6V6. Ho tutti i bollettini della geloso dai quali ho attinto parecchi schemi in quanto internet non esisteva. Complimenti per il tuo canale che mi fa sognare.
@fortj36 жыл бұрын
How can anyone give a thumbs down to any Mr Carlson's Lab video? Yet another great video, Mr Carlson. I'm addicted to your videos. I don't watch them in any kind of order. I'm looking at a Newcomb D-10 and thinking about converting it into a guitar/bass/harmonica amp. Any tips you can give me?
@cuban9splat7 жыл бұрын
Another big YES to the question about your transmitter tour idea! Well done video as always. Thank you.
@charlescartwright63677 жыл бұрын
Aloha- I cut my teeth with the vacuum tubes as transistors were too noisy and would never be able to handle any power or high speed transit switching. So much for the wisdom of the day! I enjoy your channel as I enjoyed the component level repair of the electronics I was working on. I always said I would retire when we quit component level repair, and I did, but I also never thought I would see the day I could sneeze and blow away all my spare parts. Modern is ok as my ham radio gear is more stable and more accurate than some of the test equipment we used. Thank you [Mahalo] for your time and work reviewing the older technology. Aloha No.
@MrCarlsonsLab7 жыл бұрын
Glad you're enjoying the video's Charles! Thanks for taking the time to write.
@gibbyrockerhunter3 жыл бұрын
God I love your channel. I am (hopefully) picking up my first tube amp tomorrow. When I got the good news my first thought was to see what you had to say on the subject. Thanks for all the awesome content.
@OsmosisHD7 жыл бұрын
I have an Lafayette tube amp (SE, Class A) from 1967 It hasn't had any maintenance and was sitting there collecting dust for +10 years , till I bought it from at a garage sale. The only thing I did, was replace all the caps, new tubes, new potentiometer and added a bleeder resistor in the supply & cleaned the unit up a few hours later...It worked like a charm! As if it was brand spanking new They don't make stuff like that anymore sadly, build to last.
@gettingpast43917 жыл бұрын
Great video, loved the leakage demo with the magic eye. Great example of how useful these old testers still are. Subscribed!
@MrCarlsonsLab7 жыл бұрын
Thanks Tom!
@rubusroo687 жыл бұрын
That was great, thank you. I wonder how many are still sitting forgotten in a dark dusty corner.
@bryantwhittaker41633 жыл бұрын
I enjoy watching your videos because they're relaxing and you learn something when it comes to electronic repair and care of electronic devices
@CVD-di1xn7 жыл бұрын
Back in the day, I grew up on building tube amplifiers like these. I started with a blank aluminum chassis, punched the holes and did all the wiring. I guess I'm old .... funny, I don't feel old.
@tonygriffiths24856 жыл бұрын
Thanks am having a great time seeing the older videos. Very enjoyable and always something to learn.
@pneumatic007 жыл бұрын
As bulky, heavy and primitive as they are, I doubt will ever get over my love for old tube amps like those. I too stumbled on a guy who was selling his whole garage full of electronic stuff, mostly from WW2-50's, and in that pile were 32 NOS JAN Sylvania 6L6GA tubes. Sweet. In cartons, though the cardboard would literally crumble if you touched it. So, I built a tube matcher to see if I could gather sort-of matched pairs. Apply the same conditions to two tubes and with two identical panel meters read the cathode currents. I was amazed; very few pairs could be matched closer than 2-3 mils and the readings ranged from 23 to 45 ma. They were all over the place. They all worked but it's as if they were different tube types.
@ka0kuj5997 жыл бұрын
Excellent info. Paul We'll take the big transmitter tour too. 73, Scott W0KU.
@scottweisel364010 ай бұрын
When I was a teenager I was given a tube stereo (15W/channel) and thought I would “improve” it by changing a lot of the the point-to-point wiring to PC board which meant designing the PC board. I bought the etching kit from Radio Shack and completed that phase of the project but never finished. The amp died from unknown causes and I shelved everything. I now understand there is a reason why the tubes and components are laid out the way they are on a tube amp, and I would have created a lot of problems had I “succeeded” by completing the project. One feature of this amp that I remember was that it used a full bridge rectifier with four power diodes, rather than a tube rectifier.
@jimadams24737 жыл бұрын
Another very cool on vintage gear. Nice work. And, yes, it would be great to see inside a transmitter that you can literally stand in!!!! Thanks for the GREAT vids.
@oldestgamer7 жыл бұрын
"some form of a tech"... I LOVE it! There are so many "some form of a tech" that I have seen here on youtube and out in the world with NO idea of what they are doing! Love that comment!
@johnbellas4907 жыл бұрын
Paul this was interesting Video, in that it reminded me of when I had bought from P&T Surplus in Kingston N.Y. USA a Bell Tower Carilon tape system WITH the power amp much like you have there! The tape was contained in quite LARGE tape cartridges about three times the size of the old cartridges used in broadcast studios!! the player could hold 12 cartridges that held the hourly bell chimes, then there was another player unit that held 3 cartridges I think these were for any public announcements by the church OR civil authorities. I had rebuilt the system had it for a while then sold it to another church that had built a new facility about 10 miles down the road from me!
@MrCarlsonsLab7 жыл бұрын
Great story John, Thanks for sharing that!
@nmbdk49557 жыл бұрын
Great little thing! It would be nice to go over the schematic and get an introduction/analyzation of how it actually works :)
@strangersound7 жыл бұрын
Check out "Uncle Doug" on KZbin. He has some great videos covering tube amp circuit design and signal flow, etc.
@nmbdk49557 жыл бұрын
Already subscribed ;)
@Equiluxe17 жыл бұрын
Back in the early 1960's when at school I was taught by an old ex military radio man who by then was repairing TV's that the first thing to check was the switches and pot's then the resistors then valves and capacitors were the last thing to go wrong. Certainly in a lot of the old stuff I was playing around with resistors were cracked and cooked with heat and capacitors were rarely bad. I fixed many a radio that had noisy resistors back then, most of what I had to play with was from the 1920' and 30's. At what time did capacitors start to be the main culprit and resistors hardly ever fail as that appears to be the case these-days.
@dylanheadrick37897 жыл бұрын
Definitely exactly the video I was looking for as well as the tube troubleshooting tips vid. I've got a 1957 VM phonograph/changer that is non-functioning as well as a 69 Hammond H-182 organ with low output volume. I've done the obligatory electrolytic/paper cap replacement in both, but the phonograph is still silent. None of the tubes are lit but I can hear a very faint hum from the speakers. The chassis is buried in the body which makes it quite difficult to get to its underside while keeping it connected to the speakers. After watching your troubleshooting tips, I'm definitely going to be checking the heater voltages as a first test to see if i'm in need of a new transformer. On the organ, going through the service manual, the speaker RMS voltages are supposed to read about 10.5 Vrms, however mine seem to be at about 2 Vrms at maximum volume. After watching the same video, I'm assuming it could be the bias resistors off of the cathode or the plate resistor which could be causing a small differential in the voltages. Again, all electrolytic and paper caps have been replaced, but it only helped so much. I swear I learned more about tube amp theory and diagnosing in your two videos than I have in years of fiddling with them.
@emilalmberg10967 жыл бұрын
Thank you for this video! Now you have to show us how we build our own leakage meter ...
@hugoradiorepairsmartel5147 жыл бұрын
Very good video Paul!! I would love to see the inside of an old broadcast transmiter!! Take care, Hugo
@matthijshebly5 жыл бұрын
This channel is a true gem...
@eliduttman3157 жыл бұрын
Mr. Carlson's warning about lethal voltage is spot on. An old "chestnut" says work with 1 hand in a pocket. You can modify the "chestnut" to state or wrapped around your belt, at the small of your back. The point is not to have a shock pass through your heart. Mr. C. are those coupling caps. really PIO or are they waxed paper? Hermetically sealed PIO caps., like the available Soviet surplus K40s or OS "Vitamin Q", seem to stand up well to time's ravages. Are you planning to use 2X 6SN7s in Williamson style circuitry? Eli D.
@Erzahler6 жыл бұрын
+hawkturkey: The classic flyback transformer! There was a running joke back in the day. Q: Why are they called flyback transformers? A: Because when you touch one, you fly back! 😄
@markschmitt55505 жыл бұрын
I just aquired a Maas model 50 and a 500 in pristine condition. A quick look, I was able to see a rough picture in my mind of the 50's circuitry. I'm amazed that there isn't a schematic on the internet, as popular as these were. It looks like I'll have to pencil one out. It appears that the 50 will require a preamp, too. I may remove the two triodes and wire in two 6sn7's. Part of me wants to politely convert this old girl into a sweet guitar amp. The 6v6 screen regulator in a novel idea; something that a few 1k resistors could easily do, opening up another tube socket. Now for the best part... the serial number on mine is 80!?! The audio chain caps in mine are ceramic, and not the axials that you have in yours.
@MrCarlsonsLab5 жыл бұрын
I have a complete re-design of this amp on Patreon with schematics, and a lot of other information.
@abeleballestri6127 жыл бұрын
Thanks for the interesting video I just admired and I must say it was a real surprise to see such a wonderful amplifier that can work for hours uninterrupted way doing its job. Looking forward of seeing you again ,thanks for the time you have given us.
@alltopnotch2357 жыл бұрын
Firstly another great video I for one would love a tour of a broadcast transmitter
@K7AGE7 жыл бұрын
Your capacitor stock must be amazing. Seems like every repair project you change out all the caps. It would be interesting to spend a few minutes describing the parts that you stock and how you decide what to stock.
@Satchmoeddie6 жыл бұрын
You should see mine..... When Capital went out of business, I was buying old caps by the pound, 100 pounds at a time, and spent weeks and months, checking & sorting. Then I did some reforming, but if they don't start to show progress fast, they get chucked.
@BrokebackBob7 жыл бұрын
Your vids are spectacular and I love that you use Heath products in your lab.
@MrCarlsonsLab7 жыл бұрын
Thanks Bob!
@radioengineering82477 жыл бұрын
Great vid, very informative! YES please to some videos on big AM and FM transmitters that use tubes as finals. Please make them as in-depth as possible including info on how to set them up, fault-finding and general operating tips. Thanks!
@vinylhound437 жыл бұрын
Yes to the vintage transmitter tour, please. Thanks for this video.
@KarlsLabReport7 жыл бұрын
Thank you for the good info!! Have been working on restoring some vintage ham radio equipment that belonged to my dad. There is some home-built audio stuff he had, too, that I plan to do at some point. VERY useful information for someone like me who grew up working on solid state stuff. THANKS!
@borisromanoff42443 жыл бұрын
a nice idea showing your transmitters too!
@richardlitwin40466 жыл бұрын
Yes I'd be fascinated to see the inside of a broadcast transmitter. Thank you very much.
@04jkv7 жыл бұрын
Thank you for always posting these videos they are always interesting to watch.
@fernandocoutinho66614 жыл бұрын
Dear Carlson, Thank you for your video and knowledge sharing. About a year ago I purchased a Luxman MQ-88uC and really like the sound but I have experienced one problem that is distressing me...suddenly there's no sound from the left channel. In one year of intense use it has now happened four times. I am using a single source connected directly to the Variable input and after turning the volume down and up a few times the sound eventually comes and no more issues for a few months. Since it works well most of the time and I can't replicate the problem it feels awkward to send it to repair service. On the other hand it is very disappointing that such an expensive amplifier has this kind of issues. I changed the driving tubes (both ECC83 and ECC82) to NOS mullard after experiencing the problem the first three times, I had hopes this could solve the problem but it happened again. I have checked the bias current and all seems fine, reading near 480mV in all tubes. Should I worry about thins? Any suggestions would be much appreciated. Best regards.
@jamesclawson91564 жыл бұрын
Old tech here, love old gear and other stuff ,, enjoy all , 2 thumbs up
@MrCarlsonsLab4 жыл бұрын
Thanks 👍
@audiotechlabs46507 жыл бұрын
Fantastic video! I cannot say enough! You might have explained the reason for more than one rectifier tube. Honest, these are great! Thankz
@JulianA-tr6pt6 жыл бұрын
Incredible! It's crazy to think that they were run nonstop.
@richardmouton98837 жыл бұрын
i really like your videos. i never found a person where i live that could teach or learn from. tv repair/ audio is not being trained to new people.
@MrCarlsonsLab7 жыл бұрын
Thanks Richard!
@csj96192 жыл бұрын
I really like point-to-point wired electronics. When a modern solid-state amp fails, it's often more cost-effective to replace it rather than have it repaired. (Unless one does the repair work oneself)
@pradolover7 жыл бұрын
definitely interested in the radio transmitter tour!
@guitarpoetone17 жыл бұрын
Hi I really injoy your teaching methods your very clear and explain how everything works alone and together visually the art of the inside off the amplifier is beautiful to me thank you for spending your time and showing us your craft an information...
@Erzahler6 жыл бұрын
I just subscribed to your channel! That was a very interesting subject you just covered, and the way you explain everything makes it very easy to understand. I do like the older tube equipment, especially those with the point-to-point wiring. Everything is laid out in a logical manner and is much less complicated that those with circuit boards. Plus, the older tube stuff, if maintained properly (or sometimes not maintained at all!) will last for years! 70+ years for tube gear as opposed to how few number of years for a transistorized equivalent? No contest! If that same amplifier had transistors in it and water (or bird "squirt" got in there), bye-bye transistor! I also liked your cap tester with the eye tube in it. Reminds me of those "tuning eye" receivers which were popular back in the day. My grandmother had one, I think it was a Zenith, an early FM receiver with a center-channel tuning eye. It was one of those models which was manufactured very soon after the FM broadcast band was moved to where it is now. I will just stick to the phrase, "If it doesn't glow, it ain't real!" Thanks and 73! de NØJAA.
@MrCarlsonsLab6 жыл бұрын
Welcome!
@smallenginedude717 жыл бұрын
the story you told about the somewhat damage resistor is a teastament to the quality of those amplifiers!
@tom76017 жыл бұрын
If I remember right, the audio amplifiers in the drive-in theater we used to go to used ranks of 807s. Talk about space heaters!
@JerryEricsson7 жыл бұрын
Hate to ask an off topic question, but I guess I will just go ahead and do so; I have a Kenwood TM 241A 2 meter mobile transceiver, picked it up off Ebay last year, fellow said it worked great when he last used it. I got my ticket last May but didn't get a chance to hook the unit up till November, and then found that the microphone, the one with the on-board keypad would not key up the set, in fact it acts as though it is getting no power. I hooked it up just before we left South Dakota for Arizona in our motor home, it is mounted in that rig. So after getting to Arizona, I messed with it a bit and finally gave up and ordered the cheap microphone, the one with no keypad. That one will key up the radio, and I can talk back and forth to my two 2 meter hand held units, however I have yet to make contact with any other person, and can't seem to hit any of the local repeaters. At any rate, I guess my question is, is there a fuse in the transceiver that sends the power to the microphone that would cause the big microphone to not work but allow the smaller microphone to key up the set?
@Vladimir-hq1ne7 жыл бұрын
It could be very interesting to look at capacitor tester you've mentioned - schematics and possible failures. Thank you for interesting videos!
@normjacques68536 жыл бұрын
Carillon systems are still in very wide use. Although the newer systems use either CDs or digital audio files (.mp3 or .wav) as a source, the old tube power amps are often kept in service, for all the reasons that you stated....unless some sales weasel lies and slings a good line of bovine fecal matter, and convinces a church that old is bad! One correction I might offer: 'Head (source) units and power amps were usually kept in the church's vestry or, in the case of a very large church, located at the rear of the nave (closer to the bell tower, but still out of weather). I spent countless hours, days, etc., working on these and other low voltage systems, and the biggest issue was speaker wiring...which WAS exposed to weather, birds, and vermin! If a power amp failed, it was usually a result of an open speaker line. The biggest point of failure was always the older (tape-based) head units, with all the inherent weaknesses of tape playback equipment, running 24/7 in uncontrolled environments.
@MrCarlsonsLab6 жыл бұрын
Thanks for taking the time to write Norm!
@TRXLab7 жыл бұрын
finally I was able to manage to watch a great video Paul. Never heard before about Bell amplifiers...Thanks for sharing. Take care
@nicwilson892 жыл бұрын
I really wanna convert one of these into a guitar amplifier. I've got a beautiful old metal 'Ever Ready' radio chassis from the early 40s that came empty that has a nice view inside from the front that I'm going to build a tube guitar amp in to, whether from scratch or modified something else :)
@Tipo8747 жыл бұрын
I am about to rebuild a 1955 Wurlitzer 1800 amplifier for a friend and as I have not worked on tube amps before I looked around a bit for tips and tricks and stumbled across this channel. I have spent hours after hours watching you repair hopeless stuff and also explain how stuff works! ;) By far the best channel on KZbin! I have now marked the outer foil side on all new caps, had no idea about this. I have been looking for the nice ceramic stand off's you use when replacing the can electrolytics but not been able to find more than a few very expensive ones. Where can I find these?
@alimaleki2177 жыл бұрын
Another great video! I decided to see if I could find one of these. I did, but nothing like the ones in the video. Model 40 (if I recall) and it was basically being held together by rust and electrical tape!
@shyleshsrinivasan50926 жыл бұрын
Thanks a lot sir ! Please put more of these videos !
@joedebono40123 жыл бұрын
Hi really interested in the stuff there’s a lot to learn and it’s good to have somebody giving you some tips you can even save your life who is working on stuff like this Just goes to show sometimes you can’t be too careful
@fredfeldmeier82282 жыл бұрын
Hello Paul, Fred here.. I was thinking, maybe you can do a future video assembling a 6BQ5/EL84 single ended mono class A tube amp.. just a suggestion..👈😎😉 Thank you for the great video Keep it up Ur the best 👈😎👍
@stevedoubleu99B7 жыл бұрын
Very interesting video Paul (yet again), and yes I would like to see inside a broadcast transmitter.
@CryptToneMusic6 ай бұрын
Man I would love to find cool old stuff like this. I usually only come across very dilapidated AA5 or other similarly sketchy radios haha.
@StonyRC7 жыл бұрын
Aaah, the capacitor tester needs a cap-job ... that's monkeying with my brain! What can we rely on???? LOL REALLY interesting video (like all your others). I'm no Electronics Engineer, but I always learn a LOT from your channel. Many thanks from UK.
@MrCarlsonsLab7 жыл бұрын
Glad you're enjoying!
@ianforfun15 жыл бұрын
Glad I read the comments first but I was going to say the same thing 're-capping the cap tester' which amused me too! Thanks for saying it as I thought about the irony and it hit me, cap tester cannot ever test itself....!
@wadehicks92707 жыл бұрын
Always great videos Mr Carlson. I have a few items that use tubes. I have 2 Fender guitar amps. Both I bought new. One of those amps is a Fender Deluxe Reverb II it's about 36 years old now and sounds better than my Fender Twin Reverb amp. I won't have nothing but a Fender amp and none of this solid state stuff lol 😁 I've kept up with a lot more powerful solid state amps with that old Deluxe that only puts out a whole 20 watts RMS. And I would really like to see inside a transmitter so count me in lol have a safe and blessed day Sir 😊
@garydrumm28793 жыл бұрын
Nice, and very thorough as usual. Thank you
@geofflotton52927 жыл бұрын
The number of rigs I destroyed as a kid just to build up my resistor collection now makes me cry. Resistors, capacitors and if you were lucky a VR or two. The valves were useless so thrown against brick walls.
@MrCarlsonsLab7 жыл бұрын
Those poor tubes.
@fongy2003 жыл бұрын
It's beautiful but the rust on the chassis needs addressing. Thanks Mr C, great stuff as always.
@bucyruserie12117 жыл бұрын
I really enjoyed watching this video and the "history" stories as well, very interesting. I couldn't agree more about the power cord, a 3-wire cord just doesn't look right on vintage equipment. The Ground or 3rd wire just ties in at the panel to the neutral (white) wire anyway.. I do however always use a polarized plug for safety :) Take care, Tom
@MrCarlsonsLab7 жыл бұрын
Glad you enjoyed Tom!
@MrBrian87497 жыл бұрын
Enjoyed this video Mr. Carlson... Solid State amps cannot match the rich full sound of Tube amps in my opinion. Thanks for sharing this interesting video.
@AnujArya_Curious7 жыл бұрын
Another proof that the old age electronics were so good.
@richarda36593 жыл бұрын
Although this would probably be obvious to many, I want to point out that this amplifier is monophonic. That might have been a worthwhile thing to mention at the beginning of the video. I also want to point out that the circuit can be as simple as it is because, unlike a high-fidelity amplifier, this amplifier has no need for an accurate audio frequency response, as it would not be necessary to put out much power in either the bass or in the high-frequency range, but would instead be designed for maximum power in the midrange only, where most of a bell's energy is concentrated.
@rustycalvera977 Жыл бұрын
good video......what an impressive lab....you need a good wide angled lens to capture it all.
@TheAlfieobanz7 жыл бұрын
"Pigeon crap," ha! Another cool vid Mr. C.
@heathwellsNZ7 жыл бұрын
Definitely interested in seeing some vintage broadcast amps...
@JohnDoe-uq3mx7 жыл бұрын
Another church bell tower video. That's awesome.
@TheRadioShop7 жыл бұрын
Thanks Paul for the tour and explanation on this amplifier. The simplicity of the circuit is amazing. What model is your capacitor tester? I have the IT-28 and it is laid out the same just different colors. Enjoyed it Paul.
@MrCarlsonsLab7 жыл бұрын
Hi Buddy. Your tester is pretty much the same, just a different color. This is the IT-11. Thanks for stopping by!
@78awhite7 жыл бұрын
+Mr Carlson's Lab I am interested in the eye tube overload and volume indicator as seen in the Maas Rowe 500a. Do you happen to have one of these and can you explain visual indicator circuits in audio amps like this? I have tried to find a schematic for the 500a without success. Thanks for your videos, I always learn something:)
@josephf1517 жыл бұрын
Great video as always, and a big YES to the transmitter tour idea. If it is such a large transmitter (I believe you showed the outside of it in an early video) what main power tubes is it running? 833As or 833Cs?
@MrCarlsonsLab7 жыл бұрын
Hi Joseph. This version has a pair of 810's modulating a pair of 810's.
@josephf1517 жыл бұрын
Thank you for the reply. I have little knowledge of 810s, that sounds like it would be a great video.
@JoseRochaMicroondas7 жыл бұрын
um espetáculo de equipamento que coisa linda
5 жыл бұрын
Did you keep the modified version Mono Output? I didn't catch that part.. 50W is more than enough with a Tube amplifier. Such robust sound. I remember the first tube amp - ( H.H. Scott ) amp I had, it was like 25 watts and sounded huge. It's a very pleasing sound especially in the Low / Mid range.
@advanceg21166 жыл бұрын
Had one when I was a kid. Don't know where I got it however, a friend of mine's dad fixed carillons. Don't know what I did with it. I have been looking on KZbin for this amp for a year. Here it is. Thanks
@wildrootsfarm19757 жыл бұрын
Excellent overview and repair process. Im enjoying this very much! - Thumbs up!