2 ай бұрын
9 ай бұрын
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@williamlewis4379 2 сағат бұрын
Should I be concern about covering the resistor in heat shrink tubing since the heat coming off the resistor is restricted? Thanks
@MikeFreda 2 сағат бұрын
Thanks for commenting. No, not at all. There is no issue since the discharge time constant is only a second (depending on the value of the cap) Since the amp is not actually on, most of the current is dissipated in a split second. A 10watt resistor would barely notice in a normal PSU. If you had a large array of capacitors… perhaps a 25watt resistor would be better. You can use the Time constant formula and ohms law to determine proper limits. Cheers.
@williamlewis4379 Сағат бұрын
@@MikeFreda Thanks for your quick reply!
@Warsudi-z1j 19 сағат бұрын
IF THE FILAMENT VOLTAGE USES 12.4 V. WILL THE SOUND QUALITY NOT CHANGE?....... IS THE SOUND STILL THE SAME AS USING 6.2V VOLTAGE?.... I HAVE MADE THIS PREAMP WITH A 6.2V FILAMENT THE SOUND IS VERY GOOD. I AM FROM INDONESIA.👍
@MikeFreda 15 сағат бұрын
Not change in sound quality. The only change you may find is possibly some residual hum if the grounding, wire placement or transformer placement is bad. Cheers.
@Warsudi-z1j 4 сағат бұрын
@@MikeFreda I made this preamp like in the link (schematic) the sound is very good. but I use SMPS voltage 150v and 6.3v there is no hum. thank you Mr. Freda for your answer. greetings from Indonesia too
@millertime6sixty 20 сағат бұрын
Are you using 1/2 watt or 1/4 watt resistors?
@MikeFreda 15 сағат бұрын
Doesn’t matter. This is very low current draw. You can use ohms law to calculate. V=IxR & P=IV. Power is in watts. Cheers.
@millertime6sixty 21 сағат бұрын
Would you be willing to show how to program the arduino board for this project? I'm new to arduino boards. Awesome work by the way!
@MikeFreda 15 сағат бұрын
The program and wiring diagram is linked in the video description. Cheers.
@HR-mv4qm 2 күн бұрын
Hey whats up brother I have a vintage Peavy Amp Renown Solo 212 , Solid state amp I cant find any videos on how to discharge solid state amps
@MikeFreda 2 күн бұрын
I don't work on SS amps much but the principles are the same as tube amps. The larger power supply caps are typically polarized (they have a positive and negative) Ground one side of the probe/discharge tool to the amps ground stud and touch the + side of the larger caps for a several seconds. Use a multi-meter to confirm voltage. Also a good idea to find the schematic of the amp to help locate the caps. Some SS amps have draining resistor. If left off for a while the caps may self drain. Always use a multi-meter the confirm voltage. If you are not comfortable in doing this, I'd recommend taking it to a technician to service it. Cheers
@kapenakanaiaupuni5816 4 күн бұрын
Don't mess with it if you screw it up you could short out the system
@audiowize 4 күн бұрын
This design is copied from Valve Magazine Volume 4 Number 5 1998. Maybe instead of redrawing the schematic and putting your name on it, you could give credit for the origin of the design?
@MikeFreda 4 күн бұрын
Thanks for commenting, Yes, you are correct, the Valve article did inspire me to build this preamp. It's not exactly the same and I do show the entire schematic which the article in Valve does not. It does state in the article that permission is granted to build one for Hobby purposes. I don't have an issue giving credit. Since Electronic Tonalities doesn't really exist, what do you recommend? Cheers
@audiowize 4 күн бұрын
@MikeFreda I think it's pretty obvious who the credit should go to. The company which published Valve is still very much operating.
@MikeFreda 4 күн бұрын
Thanks, will do!
@kennethcoutinho4439 5 күн бұрын
Beautiful
@MikeFreda 5 күн бұрын
Thank you!
@bullhippo9023 6 күн бұрын
Excellent use of many disciplines, very impressed by your skill.
@MikeFreda 6 күн бұрын
Thanks for commenting. I'm glad you liked it! Cheers
@benjaminclingaman7551 6 күн бұрын
Coleman lanterns are cool.
@MikeFreda 6 күн бұрын
They sure are! Cheers
@kennethcoutinho4439 6 күн бұрын
Awesome 👌
@kennethcoutinho4439 6 күн бұрын
Beautiful sound
@MikeFreda 6 күн бұрын
Thanks for commenting! Cheers
@kennethcoutinho4439 6 күн бұрын
Wow awesome build and beautifully explained.....
@MikeFreda 6 күн бұрын
Thanks, I’m glad you found it helpful! Cheers.
@kennethcoutinho4439 6 күн бұрын
Awesome
@kennethcoutinho4439 6 күн бұрын
Beautiful
@MikeFreda 6 күн бұрын
Thank you!
@CleverNameBot13 8 күн бұрын
Beautiful work! Thanks for sharing!
@MikeFreda 8 күн бұрын
Thank you, I’m glad you liked it! Cheers.
@adairjanney7109 11 күн бұрын
nah i live life on the wild side
@MikeFreda 11 күн бұрын
Surely you jest!? To be honest, when I first started I just used a multi-meter and measure and drain the PSU caps. (20+ years ago). I did eventually get shocked when it was a little too complacent. I always drain the caps now when I work on an amp. Doesn’t take much to ruin your day! Cheers.
@nx99 13 күн бұрын
Thanks Mike! This vid is worth twice the price just for the thread size / pitch info alone!
@MikeFreda 13 күн бұрын
Thanks, glad you found it helpful! Cheers.
@brucerosner3547 18 күн бұрын
Where are the power, noise and distortion measurements?
@MikeFreda 17 күн бұрын
Yes, I’m working on that. I accidentally fried my scope and working on getting a replacement and proper test equipment for these sort of measurements. Please stay tuned! Cheers.
@jean-luccaspers7783 18 күн бұрын
Thank you for this wonderful video. I just looked up the spec sheets of the Hammond 261c6 to check if they can handle 230V from the European grid. I'm not getting smarter. On top of the spec sheet is written that the 261c6 is only for 115V but the B6 and D6 is 115/230V and 50/60Hz. The D6 seems to be the choice, but when I look up the D6, there is no hint, that it can handle 230V. The transformer itself says 115V 50-60Hz. Have you any experience with Europeans and the same problem? I can't find something in that spec range on our market, so I have to import it. Would be happy to know if it works before I order something. Cheers and keep going, your videos are great!
@MikeFreda 18 күн бұрын
Thanks for asking. Since I'm in North America, I don't have a lot of experience with the European grid. As per the spec sheet, the 261D6 has dual primary windings. I would suspect that you would wire those in series for 230v operation making note of the phase dots. The Hammond 229B230 shows how to wire it for 230v. Another option is using a their 300 series (220v transformers). 369AX should work nicely. Use a full wave bridge and omit the CT connection. I hope that helps? Cheers
@jean-luccaspers7783 18 күн бұрын
@@MikeFreda Thank you! That helps a lot. I thought so. Sadly I couldn't find a picture of the 261D6 at first, but then I found out about the dual primary windings. I think, I'll give it a try. The hint with the 229B230 wiring is really helpful.
@patrickhall3878 19 күн бұрын
Had a tank that was terrible.. filled it with Berrymans carb cleaner and let it set for 12 hours.. cleaned it completely..no issues
@MikeFreda 18 күн бұрын
Thanks for commenting. Glad it worked out for you. Sometimes they can be too far gone and/or dangerous to operate if too thin in spots. Cheers
@ahmedsahid5036 19 күн бұрын
For this part: Hot (black) wire goes to: - switch - switch to light - light to outlet (hot/skinny side) Quick question, for the 'light to outlet' wiring portion. My bulb/light holder has two screws for neutral and hot connections. One of the hot screws obviously has the wire connected directly to the switch. To connect the light to the outlet's hot side, does this wire have to be connected to the neutral or hot side of the light holder? In other words, do I attach this wire going to the outlet to the 2nd hot screw under the light or on the neutral side which has nothing connected to it at this point? Thanks for your help.
@MikeFreda 19 күн бұрын
Thanks for asking. The light socket can be wired in any way just as long as it's on the hot side before the outlet. You don't have to worry about the polarity of the bulb just as long as it's inline on the hot side before the "load". Some sockets have a safety ground/bond and two attachment points for the bulb, hot (black) and common (white) and green (bond). Also, the outlet side bonding straps should be intact as well. Both sockets should work. I hope that helps?
@ahmedsahid5036 19 күн бұрын
@@MikeFreda Thank you so much for your prompt reply. In the end, I wired everything else just like you did and for the issue at hand, used the common side of the light socket and from there wired it to the hot side of the outlet. Tested it afterwards and everything works great; even tested with a very brief shorting of a wire and saw the light bulb illuminated pretty good. Thanks again for sharing this video and you have gained a new subscriber.
@DS-fc7ok 20 күн бұрын
well done!
@MikeFreda 19 күн бұрын
Thank you! Cheers
@stevemccoy8138 20 күн бұрын
I'm gonna build one, I have one already, but I can't find it 😂. Thinking I gave it away. 😊 Thanks
@MikeFreda 20 күн бұрын
Thanks for commenting! I hope it works out for you. Cheers
@bussi7859 20 күн бұрын
Why do as little as 1 W? 10W is just as easy
@MikeFreda 20 күн бұрын
Yes, sort of. ~5 watts is easy. ~10w SE takes a bit more effort. You would need a larger PT and OT to handle the extra current draw of a 6L6 power tube. All this costs more. The point of this amp is to see if alternate power tubes could be used for lower volume and good tone, I also wanted to see if I could make it less expensive buy using smaller Power tube, PT's /OT's. (FWIW, A 12AU7 would also work well with this circuit) Many people make the "Champ" circuit so I wanted to do something different. I am happy with the results. It was a fun project to experiment with. Thanks for commenting, cheers.
@NaomiEric820 21 күн бұрын
Very impressive! I am considering going down the amp creator rabbit hole and this is perfect. Let me ask, what exactly is the difference between this amp and the boutique amps costing tens of thousands of dollars? This is a Class A amp I believe? New Sub here 👍
@MikeFreda 20 күн бұрын
Thank you! The amp I build it true point-to-point where many mass produced or boutique amps use PCBs and proprietary PT's / OT's. Everything I was is easily sourced. They may also add some protection and better regulation to help with stability and possible warranty issues with people hooking things up wrong or the variance on the wall voltages. This is a Class A single ended amp. Cheers.
@dans8287 22 күн бұрын
Wow, I am going to have to step up my game here. You weld up your own chassis? Amazing! The lettering on the chassis using the cricut stencils is a great idea as well! I decided to build my own stereo single ended output amp during the shutdown in 2020. It uses 6AQ5s instead of the 6BQ5s. Interesting feedback loop idea, I tried to implement global negative feedback in the one I built but I never got that to work so it still has no negative feedback. Apparently there is a lot of combined phase shift in the preamp and output stage and never figured out how to measure it or compensate for it. My ears are shot anyway so it sounds ok to me even though there has to be more than 10% thd at 4.5 watts. I just found your channel and subscribed. Your builds are top notch!
@MikeFreda 21 күн бұрын
Thanks for commenting. I’m glad you like my content. Building tube amps is a fun hobby and realistically, if it sounds good to you then that all that matters! Keep on building! Cheers.
@DanBrown-t5j 23 күн бұрын
What is the yellow wire connected to?
@MikeFreda 23 күн бұрын
The yellow wire is 12v keyed powering that section of the distribution center.
@DanBrown-t5j 23 күн бұрын
@@MikeFreda If the TPMS uses 5v won't this smoke something?
@epenaloza52 23 күн бұрын
After months of looking i finally found the one!😂 best of all none of that Locking drawer rails true diy! Just need to go to my metal store and pick up some parts
@MikeFreda 19 күн бұрын
Cool, I hope it works out for you! cheers
@w.g.sameeralakshan3704 25 күн бұрын
Wow.. Insane
@arnieslab 26 күн бұрын
Are the capacitors on solid state amps just as dangerous?
@MikeFreda 26 күн бұрын
Yes, they can be. It really depends on the PSU design, voltage rating of the amp how large the caps are. A large value capacitor (i.e. 1000mfd) at 100V can still pack a punch. Always a good idea to drain the test with a multimeter. Cheers
@w.g.sameeralakshan3704 26 күн бұрын
Hi Mike Freda, I recently came across your video and found it incredibly informative. Thank you for sharing such valuable content! I have a Coleman lantern, model 231, which is in rough shape. It's heavily corroded and was damaged when I got it. I’ve restored some parts of it-welding the tank's leak holes and painting it-but now I’m trying to find burner parts and a pump to complete the restoration. Collecting old lamps is a hobby of mine, and restoring this Coleman lantern has been a labor of love. Would you happen to have any advice or suggestions on where I might find these parts? Any guidance you can offer would mean a lot. Thanks again for your helpful videos! Best regards, Sam from Sri Lanka
@MikeFreda 26 күн бұрын
Thanks for commenting. Glad you find my videos helpful. I’m not too familiar with Coleman export models but the 231 is very similar to the 220J. Many of the parts are interchangeable. Try to purchase one of those and order parts from Old Coleman Parts. That being said, if your tank is bad and you tried to fix it… I would be very cautious. I suspect more is wrong with it. I would get a new tank (fount) if I were you. Just get a used 220J and swap the required parts. Cheers.
@w.g.sameeralakshan3704 25 күн бұрын
@@MikeFreda Thank you so much for your quick response and the helpful suggestions! However, I’m based in Sri Lanka, and it’s quite challenging to find Coleman parts or used lanterns here. That’s part of why this restoration project has been such a journey for me! Despite the hurdles, I’m determined to bring this lamp back to life, as it’s a special part of my collection. I truly appreciate your advice, Your videos and guidance have been invaluable-thank you again! Cheers
@Moondog9322 29 күн бұрын
How did you get your fuel tank so shiny? Nice!!
@MikeFreda 29 күн бұрын
For the nickel founts I use 0000 steel wool soak in 99% Isopropyl Alcohol (WD40 will also work okay). I do that to get rid of any tarnishing or oxidation. I clean that off and then I use Mothers Mag Polish to finish it off. Some people use different methods but I found that this works the best for me. Cheers
@Moondog9322 28 күн бұрын
@@MikeFreda I've used the steel wool and mag polish, but not the alcohol or WD 40. I'll give that a try. Thanks!
@puuntineh Ай бұрын
the 24v are for the cursed man hehehe... owned 60 with 24v its a long day heheheh
@MikeFreda Ай бұрын
Yes and no. It can be a pain but I’ve learned to live with it and haven’t had any issues since I sorted out all these quirky issues. Having a 24v-12v converter for my radio and autometer gauges is another good mod. Cheers.
@trashyaudiophile7301 Ай бұрын
I like the hole WW2 look. I would suggest taking an old cell phone, and making a media server in a matching box to complete the look! That looks like a million bucks!!!
@MikeFreda Ай бұрын
Thanks. That is a cool idea. I do want to make a music server for my shop… your idea may fit the bill! Cheers.
@NsyShwl Ай бұрын
Cheaper way to do this is to buy a rechargeable flashlight from like Walmart.. they have this decent Nebo 800lumen rechargeable light for $30 and then buy a two pack of Husky rechargeable floodlights from home Depot for $20.. me personally I would run the Nebo at half power for a good spotlight for what's up ahead and use the husky flood light to brighten what's closer.. I calculate that you could get about 4 maybe 5 hours total and for $50..
@ricokoko6515 Ай бұрын
Is it a real vacuum tube amp or a hybrid amp ?
@MikeFreda Ай бұрын
Yes, no... sort of! The 12AX7 preamp tube and the 12BH7 power tube are in the signal chain for the speaker output. The 12BH7 is directly connected to the Output Transformer and the secondaries of the OT are connected to the speaker. The amp uses solid state components to tightly regulate and control the operating parameters of these two tubes. This printed circuit board has a section that is used for the headphone and lineout. It's not a true point to point with all passive components tube amp like the old Fenders and Marshalls. It's a modern amp with a mix of solid state and tube topologies. Cheers.
@ricokoko6515 Ай бұрын
@@MikeFreda thanks you so this is real tube amp
@MikeFreda Ай бұрын
You're welcome. A real tube amp? hmmm, what's your definition of a real tube amp? The tubes are in the signal chain and the output tube powers the speaker via the output transformer. So in that sense, the tubes are amplifying the guitar signal that comes out of the speaker Is it built like a vintage tube amp? No. It's a modern interpretation of a tube amp using discrete components to give you versatility and ease of mass production. You can have a look at the schematic and follow the signal chain to see for yourself. I'm not sure if that answers your question? Myself would call this a real tube amp really loosely. There is a lot of discrete components in this amp that if anything goes wrong with it, it's really hard to fix unlike vintage tube amps. Cheers
@RichStover-l5r Ай бұрын
Those are awesome
@MikeFreda Ай бұрын
Thanks! This is my main grab and go unit. Works great! Cheers.
@MikeFreda Ай бұрын
UPDATE: I reached out to PSVANE and asked them about the 6L6 max dissipation. The documented 23W is a conservative rating to ensure reliability and longevity under standard operating conditions. They have conducted additional tests at 30W dissipation and gathered feedback from other users. Based on this, they can confirm that the Horizon 6L6 tubes can perform normally at this level of operation without issues.
@1978novabuilt Ай бұрын
Nice, I used a 6.5 led pod with a 7/8 bracket to mount on handlebars then used a M18 5ah battery to power it (held inside a under seat pouch)
@MikeFreda Ай бұрын
That sounds like a good setup. I’m sure you will get many hours of ride time with that. Cheers.
@LuisGonzalez-tx3ln Ай бұрын
Worked perfectly on my 2013 tacoma prerunner. Just with some good old electrical tape i had laying around
@MikeFreda Ай бұрын
Awesome. Glad to hear it worked out! Cheers.
@Zedman3333 Ай бұрын
That's amazing, I've always liked valve amps they are really nice on the eye. Great job.
@MikeFreda Ай бұрын
Thanks, tube amps do have something special to them!
Ай бұрын
Great idea! I bought a brand new amp that was ordered and never picked up! The amp was in storage and something fell on it and broke off 3 knobs!
@MikeFreda Ай бұрын
Raw deal! I hope you are able to repair it! Cheers.
@crodles Ай бұрын
thoughts on using 12v rc batteries instead?
@MikeFreda Ай бұрын
Yes, you could. Some of those RC batteries can be volatile especially if you don't have a proper BMS and proper charger. I built mine with the M12 system since that is what I had in hand, they are relatively safe and a compact design. cheers.
@crodles Ай бұрын
@@MikeFreda im looking at it because of the price competetiveness. looks like its 12v 30000mah that comes with a barrel jack charger thing. it claims it has overcharge, overdischarge, over current and short circuit protection. it uses 18650 cells. so it would probably be better then what i could manufacture myself. it has barrelljack plugs for charging and for use. also i dont have any 12v batteries. it
@craigenputtock Ай бұрын
Wow you are so talented. I wish i could do that
@MikeFreda Ай бұрын
Thank you. What you see here is 20+ years of experience. I think if you start small, you could eventually get to something to this scale. My first projects were crude but you have to start and learn from somewhere! Cheers.
@Saltshaker762-KF4LBG Ай бұрын
Thank you... Working on a rf amplifier... Just got a nasty burn... I got lucky... I paid the minimum price for a life threatening lesson... Thank God... Play safe and have fun...
@MikeFreda Ай бұрын
You're welcome. Glad I could help. I've been zaped twice. Both times I was measuring and adjusting voltages. Always keep one hand in your pocket and the ground clipped on. Probing with both hands could ruin your day! Cheers.
@EnriqueFlores-vr8jr Ай бұрын
Thank you for this Mike. I just bought a 93’ saab thought of making then roll and your video came up. Blessings
@MikeFreda Ай бұрын
You're welcome. Glad my video was helpful! Cheers.
@jerdobi Ай бұрын
Love to build one of these as I've been looking for a China kit or something like a Van Alstine valve preamp. But, would love to build this given I had a parts list and wiring diagram. Your video is awesome and I think I could build it just from the video content although I prefer more explicit instructions. Thanks again.
@MikeFreda Ай бұрын
Thanks for commenting. This is a lovely preamp. One of my favorites. I have other on my channel if you want something easier or lower cost. Good OT's can cost a bit. The schematic, layout and parts list should get you most of the way there. It's difficult to do a step-by-step build. It would be a very long video and it's a lot of work for not a lot of return. Most people would not watch the entire video and they find it borning. It would appear that the majority of people just want the schematic, layout, parts list, a few build tips and some highlights. I've done full 3 part build video's in the past and the 2nd and 3rd parts don't get watched as much. If you have any questions or concerns, please ask. I'm more than willing to help! Cheers.
@alexdokic5567 Ай бұрын
Hi Mike, I’m getting the components to construct this Amp, but will use a tube rectifier, can you confirm which Capacitors are polarised for this circuit , I’m thinking all except C5? Any help appreciated. Alex
@MikeFreda Ай бұрын
Wonderful! Yes, you can use a tube rectifier but you will need to adjust the components a bit. The first PSU cap will need to be lowered to align with what the rectifier will play nice with. You should be able to get that max value from the tube data sheet. You should also use a higher voltage transformer. A tube rectifier typical has a 15-35V drop across it (depending on the tube) The only cap that doesn't need to be polarized is the 0.1uf coupling cap (C1) the rest should be. You could use film caps in the PSU but those values and voltage are HUGE and cost a lot. Cheers
@alexdokic5567 Ай бұрын
Thanks for taking the time to reply to my question, much appreciated Mike, I’ve built a couple of SE KT88 amps from Blue Glow Electronics, and am pleased by the sound coming to my warn out ears! For you build, I am intending to use a Hammond 370 EX power Transformer and Hammond 125 CSE output Transformers with an EZ81 rectifier Tube . I just need to work out what components need changing, don’t know if there is any tool on line to give the correct values needed for the Circuit? I forgot to mention the choke, I have a Hammond 158 M, 10H, 100ma 262 ohms DCR Any comments welcome, good or bad, haha! If I get stuck, I may have to pick your brains again Mike, and buy you a beer 🍺
@MikeFreda Ай бұрын
The 370EX will work great but it is a bit overkill. A EZ81 will also work BUT it has a 6.3v filament and its not ideal to have that on the same filament circuit for the other tubes. It will work but it is frowned upon by many tube amp builders. I'd suggest using a 5V rectifier like a 5Y3 or a 5U4. The transformer you want to use as a 5V winding. The OT are fine and the choke will work great as well. Buy me a few coffee's and I'll sketch up a schematic for you with those changes and expected voltages. Cheers
@SolarDave-r1i Ай бұрын
Aren’t you exceeding the voltage rating of the switch?
@MikeFreda Ай бұрын
The Carling Datasheets having limited information and I cannot even find this particular switch listed on it. These series of switches have a dielectric rating of 1000V. They also have a 10amp @ 250V rating of the contacts. Most tube amps won't see more than 200ma @ 500V DC. Could that be exceeding the rating, I'm not sure. I've been using this switch for a few years now with no issues. Other tube manufacturers use them as well and I haven't heard otherwise. Cheers