Johnny Hiland's MUSICMAN AMP and the SECRET Even He Didn't Know About!

This 1983 Musicman HD150 amp belonged to Sterling Ball and was given by him to chicken pickin' country guitar virtuoso, Johnny Hiland. Now it's on my bench. Let's take a closer look at what might be wrong with it and also what secrets it contains!
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[@TheGuitologist]

Subscribe to Johnny's KZbin Channel: kzbin.info Also sub to my buddy TJ's Channel here for more Johnny stuff: kzbin.info Save 10% on Native Sons Straps with this code: GUITOLOGIST10 www.nativesonsgoods.com/

[@DDE_ADDICT]

nice headstock dude poor mark

[@guitarjoe4379]

20:02 In some rural places of Croatia, there is no ground, our designation voltage is 230V, but sometimes it goes to 245V, and sometimes it idles at 216V, now you know.

[@auntjenifer7774]

I have the same Epiphone sticker on my little black mini fridge in my basement !

[@auntjenifer7774]

I also want to say that Johnny Hiland is inspired me to pick pick country music on a Telecaster so thank you Johnny and thank you Brad!

[@chrisoman2195]

The Guitologist love ur playing bro

[@mikesnyder2063]

This is much better than broadcast TV ! Thanks again Brad for great content. Johnny is a treasure.

[@peterdebad1]

Brad you never ceases to amaze me. Fixing an iconic amp and then having the man himself Mr. Hiland play. This video was a treat. Thank you for a very enjoyable video. Looking forward to the next one!!👍👍🎸

[@TheGuitologist]

Thanks so much for watching. I was happy to get to do this one. Such a privilege.

[@1980bwc]

Johnny is such a humble, down to earth guy. He never ceases to amaze me when i listen to his pickin. Just an extraordinary player and person. The amp sounds great.

[@chewbacca500]

Wow super awesome repair and then a shocking amp test with a national treasure, Johnny Hiland. You have totally outdone yourself now. I’m expecting Johnny to test all your repairs from now on. Fantastic content Brad. Love your channel.

[@1961jscofield]

Johnny Hiland is one of the best guitarists alive today. Thank you Brad.

[@leifkeane]

It's always a please to hear Johnny play.

[@jibicusmaximus4827]

i am more of a blues fan and player but yeah, he is fantastic....

[@Skiptracer1981]

He is such a good player that I forget he’s country and enjoy his playing. I can’t stand country music.

[@brittisaacrossman]

What a very cool experience to have such an opportunity!! JH is a wonderful player and I'm glad you got to include him in your video! I like that you, a person who cares very deeply about the history and lineage of guitars and amplifiers, had the opportunity to see this piece of history in person. Moreover, you had the chance to maintain it as well! What a cool video Brad - thanks for sharing!!

[@Slugg-O]

Never met Johnny but I've seen many videos and he's not only a wonderfully talented player, he's always one of the most humble guys to ever strike a chord. I have immense respect for him and what he has done. Nicely done, Brad. You refilled his treasure chest.

[@micheltremblay4774]

Brad, you have outdone yourself with one of the best, no the best sound test I've seen in a long time.. Johnny Hiland is something else, humble and talented. The Master of Chicken Pickin'.

[@abelincoln95]

I'm really stoked for you, Brad!! Great video & the opportunity to hang out with Johnny.

[@dave5655]

It was really good to see John in this video. I was tech support at a small pedal co. that John was famous for using and I got to know him pretty well. Later, ended up on the same flight to winter NAMM and spent the flight just shooting the shit with he, his wife and bass player. He's a really good guy.

[@edreynolds7427]

Started watching this because of my early '77 212 HD-130 Musicman which carried me through 4 years of touring and always worked. Big rooms, small rooms, had more than enough clean head room. In fact, I never had to run the volume higher than 3 - it got too loud. Over time put a couple of sets of tubes in it, but that's it. Fantastic piece of equipment. The video was really good until Johnny Hiland started playing through it - then it went to another level entirely!! Watched a number of his vids as well. One of the best players around.

[@KeefsCattys]

I'm not a tech minded person, and I'm absolutely not a good guitar player, but I really love watching your videos Brad. Keep up the content, its much appreciated

[@audiotechlabs4650]

Wow, you are now the amp guru to the stars! Johnny blows me away! He maybe considered a country guitarist, but his knowledge of ALL styles is fantastic! Like most fantastic guitarist, like you, he can play any style, anywhere, with anyone! Period! What a great experience you got to have with Johnny! You are so lucky to have him come to you for the service on this amp! Again you are now a guy the "Big Boys" will come to! We all knew you had it in you! Thank you for sharing! Thanxz

[@TheGuitologist]

I can’t take credit for this one. TJ Armstrong brought us together.

[@audiotechlabs4650]

The Guitologist There must be more to TJ than going with you to music stores! Tell me more.....Thanxz

[@kristiandickson2508]

HI! Kris from sweden here! just want to say hi! and that i love this channel and what you do! and this episode was a real treat! thank you for great, fun and honest content!

[@martinfrog768]

I had the pleasure of being front row center at a Gatemouth Brown concert and he had 2 Music Man 212 HD 130's tilted back on the stage sort of like montors ... both amps were miked and cranked up ... because they did not point directly at the audience they were not offensive ... Great Show! ... with that being said my take has always been that these amps were like a mix of Roland Jazz Chorus and fender twin which could be why Jazz Players and Session Pickers loved them ... Much Love to Johnny Hiland for picking on this video ... Thanks!

[@TheGuitologist]

I'd tend to agree with your assessment of the tone. Of course you don't get the Roland's Chorus, but the Phasor is a very good trade.

[@Chris66JTM45]

A really great video Brad. Reviewing a piece of Musicman history coupled with a genuine treat at the end, seeing and hearing Johnnys amazing guitar playing ... what a truly humble and nice guy he is.

[@BurtonBoyz715]

GREAT little video Brad...fun facts. Johnny...talented and a real sweetheart of a guy. Two winning traits .

[@danw1955]

That ending was *EPIC* Brad!!😁😁 The surprise clip from Johnny's place was worth the whole video and more! The little surprise with the phaser working again and the secret pullout cancel just tickled the hell out of Johnny, and he launches into some classic Waylon Jennings.. So good to hear! 🎸🎵🎶🎵 Man, you definitely made his day with that old Music Man in more ways than one! I'm definitely saving this one to watch again later. *WELL DONE BRAD!!* You are the man!😁💯👍👍

[@billyhorton1254]

Dang Brad. That's some major cred. Love your channel man. Thanks for real deal content.

[@believer936]

I worked with Johnny's dad at the paper mill in our home town. I've known Johnny since he was a young whipper snapper. His dad invited me up to their house one day to play a little bluegrass/country music. Johnny was a pretty well known performer then (still in grade school I think). Little did I know then that he would go on to become one of the finest guitar players in the business.

[@LorSTApunk07]

I’ve owned numerous Music Man amps over the years. Great, reliable, wonderful sounding amps. Wow! That ending is a treat.

[@chopperdeath]

I remember playing guitar in high school, and all the amps in the music department were Music Man's. They weren't cool enough for a teenager in the 80's, but now I realize what I was working with: A poor player with great equipment!

[@briancassidy6678]

Great video! I play through a MM RP112 and love it. Takes pedals beautifully. Wonderful surprise having Johnny there.

[@mitchmason8386]

Johnny Hiland is one of my hero’s. Man what a picker. Thanks for sharing this with us Brad!

[@tomaskey6844]

Wow was that a real treat! Watching Johnny play was amazing but for the record, I love to watch you play also Brad. This video is easily my favorite of all of them. It was interesting to see inside a hybrid and gave me some ideas on how to accomplish my goal of building a tube amp. This video was worth the hype!

[@TheGuitologist]

I appreciate that, man. Thanks for watching!

[@tomaskey6844]

@@TheGuitologist I have been wanting to ask if you have played in a band and have any videos of it. I'd really enjoy seeing that. I'm never going to be a good guitar player but I stay at it because it is good for the brain and I also call it therapy. But the best part of struggling to play is that it has given me enormous amounts of respect for those who have mastered it. I really enjoy music more and watching Johnny play was very satisfying. I'm definitely going to buy one of his albums.

[@roaddog7542]

When they spend more on the guitar than their hair and clothes I like em'. Thanks Brad... this is one of your best.

[@nelliejones1]

Another fantastic vid Brad. I'm not gonna lie. I got a little emotional at the end when Johnny got his amp back. He's jamming and you're tweaking knobs, and you can just tell it's like he got his best friend back and is fully in love. Great vid. Great job. Great amp!

[@MarkEagleton]

This was a real treat. I’m a long-time subscriber to your channel and a big Johnny Highland fan. It’s nice to see you get some love from one of the best and nicest pickers in Nashville. Good job on this one. Now I want one.

[@gumbilicious1]

These amps deserve more love. I have 4 and had to resist getting more of them.

[@DavidGlendinning]

Awesome stuff - thanks so much for featuring Johnny at the end! Love me some T-style guitar playing... :) I had a feeling the secret was going to be the 'cocked wah' effect; my '84 Peavey Heritage hybrid (130W / 2x12") has it (and it is labelled). Such a useful feature.

[@ThomasOnGuitar]

Wow this really made my day Brad.. Really cool to be a part of this... Love amps...Love geetars .. This was great..Thanx!!

[@timkohn7770]

After watching you work on various amps on your channel,I literally got hooked.Not being an amp tech,but having a fairly good knowledge of most amps,I was kind of surprised that you didn't know,or at least mention that the power switch also cuts the power output in half to the spkr.out by way of turning off two of the power tubes.Brad...really?

[@jessefillmore]

If I could start a band in Nashville tomorrow , I would beg Johnny to be my guitar player . He has a great sense of rhythm and serves every song I've seen him play . When he played with Hank 3 on the Marty Stuart show ...... Ole Hoss brought it .

[@Shiloh7377]

Love Hank 3, I've seen him 3 times in concert. He s also cool as hell we met him and got stuff signed and pics with him....

[@benlogan430]

Yes! This is what I’m taking about! Sometimes my small dreams come true! Thanks for the excellent video!!!

[@joerobinson2538]

Brad-I know u are an Alabama fan as I am. Even though I’m a rocker, they introduced me to great modern country music. I seen Alabama in the early 80s live here in Cincinnati and I seen Music Mans across the entire stage. I’m pretty sure I remember hearing that phase sound a lot in country during the early 80s. I’ve never heard a pedal sound as true as that amp circuit-yet another mystery solved!👍🤟🏻🎸

[@1980bwc]

Yep, I believe you hear it in "Lady Down On Love". They are the first thing i thought of when i heard that phaser.

[@TheGuitologist]

Yep, I can hear some of that phasor in Alabama music for sure.

[@randyheath8566]

Very Very Very Cool Brad, Johnny Hiland is one of my FAVS and I love Musicman amps. GREAT SHOW MY FRIEND.

[@andypomeroy7447]

What a great episode!!! And yes, I heard Waylon Jennings with that phaser switched on.

[@TheGuitologist]

This was THE sound of country back in the day.

[@guitarmainiac80]

kzbin.info/www/bejne/b4CUf2SvlrN5eZI Check out Waylon on Lucille off the Ol' Waylon record. Phase goodness.

[@auntjenifer7774]

But the question is I don't know if Hank Done It This Way

[@arnebroxleirnes418]

The High/Low power switch simply cuts the B+ plate voltage to the output tubes in half (from approx. 700Vdc to just under 400Vdc). This results in approximately 1/2 power.

[@whatsstefon]

@@electrofrying1685next time you have the amp in front of you, if you look carefully at the filaments, you can see them dim slightly at the half setting.

[@whatsstefon]

@@electrofrying1685 I did a repair on a Musicman ages ago. I noticed this and just assumed it was not unusual. Unfortunately, I didn't make any reference to it in my video. Now I regret that I didn't.

[@pda49184]

That was brilliant Brad.. What an immense pleasure to see and hear Johnny play and talk. ..

[@ewin1st]

Everytime I watch Johnny he is a total honest and great human being . A true gentleman and great guitar player. Keep picking

[@13Hangfire]

One of your best vids Brad... great job! I've seen Johnny a couple of times, I think the first time was at the Continental Club in Austin, TX:)

[@tomaskey6844]

Who the hell gives a video a thumbs down before it even starts? Wow! Hope they feel better now. It's probably what they do all day long. Must be boring in Mom's basement.

[@TheGuitologist]

What's worse is some of the nasty comments Johnny has said he's gotten on his personal KZbin channel. People are just mean to a nice guy for no reason. Jealousy, I can only presume.

[@WillyMcCoy50]

It's those pesky Braids chicks. They never recovered from the Pussy Melter.

[@Slugg-O]

Probably the same morons who thumb down Uncle Doug's videos. I don't get it.

[@Slugg-O]

@@TheGuitologist Damn shame. Heartless pricks. He's super nice and extremely talented.

[@TheGuitologist]

I can’t imagine how sad and decrepit one’s soul would need to be to downvote a Johnny Hiland or Uncle Doug video. I get it on my stuff though. I’m always smacking the hornets nest.

[@JuddLofthouse]

I never normally watch repair and service posts but you make it entertaining and easier to understand thank you brad great post

[@smokingtarheel3003]

My favorite video yet. MM amps are awesome, truly iconic. Johnny is just incredible.

[@hoboroadie]

Kind of sweet putting historic amps back in service.

[@piersuntersander]

Congrats Brad, that's a bit of a coup, not least because you gave a guitar legend a potential new string to his bow. He was so stoked to discover that easter egg!

[@TheDustyShed]

I just heard Johnny for the first time last week, and now you have him on your channel. Awesome content Brad!

[@JackRainfield]

Awesome video! Thanks. I love Johnny and your explanation of what you were working on in the amp was so well explained even I could understand it. Johnny is an American icon!

[@thepickerhat6996]

Informative Video and glad to see you there with Johnny. One of my alltime favourite Players! Great watch :) Man and that playing on the Phasersound at 42:36 . Frickin AWESOME! :)

[@alanburgess3453]

My favourite Guitologist vid by far.

[@jeremysimoneau3387]

Wow!! What a great find! Johnny must’ve been surely blessed to find out how really versatile and unique that amp that amp is

[@stephenlennartz3466]

Back in the day I had a Music Man HD-130 with 2 10" speakers. It was a great amp-- nice Fenderish cleans and killer overdriven notes too. That amp stayed with me a long time. I've been through a lot of amps over the years and this was a great one. Very reliable, too. Never had any issues with it at all.

[@intanto1]

I had a Music Man HD 150 2x10" combo, with Phaser and Reverb like this head; unfortunately, both ( the 150 HD head and my combo) were musically inferior to the 65 and 135 series, which had a tube phase inverter.

[@andrewsmith1520]

This video was great as ussual, but when you start showing Johnny things about his amp that he didn't know after owning it so long, it went up to 11. Great great video. Thanks!

[@mikem3929]

you know that's a fun studio when there's a CRown Royal bag protecting the Mic. lol

[@Sosu217]

Superb video as always - fantastic amp service and explanations, and amazing playing by Johnny! One of the best videos you've posted!

[@glenwhatley8034]

The cathode only needs to be above the DC value of the Grid in order to properly bias the tube with the equivalent of a negative voltage on the grid compared to the cathode. this can be viewed as a common grid (common base for solid state) amp. The impedance of the cathode is very low compared to the grid. The reason for this as I recall is that the bias tracked with the input signal so that in idle the tubes drew nearly no idle current & as the signal increased, so did the bias as it tracked the needs of the tubes. This led to tubes that would have a super lifetime compared to standard biased amps. I have had Music Man amps come in with tubes that almost looked original or at the very least old enough to be way past their normal lifetime. Very nice video as usual. Love the channel & learn a lot about the tonal mods that I typically do not get into. Thanx for another good one (albeit a year ago).

[@russellhltn1396]

The way the finals are driven are interesting. That would be similar to "grounded grid" designs. They have a high amount of negative feedback, so low gain but very clean/linear.

[@Lento_Montar]

Awesome stuff bubba.. Johnny highland awesome chicken pickin.. Love it... Great sounding amp

[@NonBinaryBisexualAdhdAgender]

Hi Brad. Love your channel, both informative and entertaining! Looking at the schematic, you were right with your first hunch about the trimpot biasing the driver transistors. It's to set the crossover point/quiescent current in the Class AB amp, just like tubes. Generally you'd need to refer to the gain curve graph in the spec sheets to determine the minimum current at which it enters the linear zone and set it for that (using V/R73 or V/R81 to measure output current). In fact, you could also consider the power section to be "cathode biased" and use the same resistors to measure current through the cathode, and you're basically using the trimpot (via the transistors) to bias the 6L6s. Just thought I'd mention this so if another one comes across your desk, you'll be able to bias to a measurement rather than a guess (although going to the point of cutoff and then back a little bit, which is essentially what you did, would obviously get you in the ballpark). One of my favourite channels, keep it up!

[@hearpalhere]

This was awesome Brad! I really enjoyed the fact that you showed Johnny playing it at the end. You can really tell how much joy he got from having his old amp working again! Awesome repair and rundown of the history of the amp.

[@facultylynx9854]

That was really cool, you made that man's day. This is why I dig Brad's show.

[@1980bwc]

You cant call Johnny Hiland, "That Man"! He's "THE Man"! Lol

[@facultylynx9854]

@@1980bwc - I think it cool that you have people you respect, and that "MAN" plays a wicked guitar, for that props to him. Unless he's Jesus Christ himself, he another human being occupying the same earth as me, and you, so stop acting like a troll. Don't waste your time telling me what I can't do, cause I'll laugh at you, and do it some more.

[@facultylynx9854]

@@1980bwc - He's great. I had to check out what your fuss was about. kzbin.info/www/bejne/faqxiX6midqEnMU

[@timmyv694]

Awesome !!!! I had a peavey Classic VTX series in the early to mid 80s that had a phaser with a pull feature like that . It was very useful at shaping my tone .

[@Bonedadyo]

Ha! I was just trying to remember which Peavey had the built in phaser. One of my old band members had that exact amp in the 80’s....thanks!

[@timmyv694]

Artie Lemos Awesome:)

[@chokkan7]

Good for you, Brad. It's great that you got to sit down with someone of Johnny's stature and chew the fat, especially after you'd given his amp a tune up...keep up the good work!

[@williamjohnson1264]

This one's special ,thanks, had a smile- for a- while after that!

[@andrewmoran357]

Brad this is YT gold - well done Johnny is a guitar God

[@factorybear5264]

I'm pretty sure Johnny Hiland moonlights as John5 and no one has figured it out yet.

[@steveburchfield5576]

i think you are right

[@funeralbillii9172]

I found Johnny Hiland in the strangest way possible. About 5-6 years ago I went to my local mall and when I got out of my car there on the ground was a white Johnny Hiland guitar pick. I picked it up and read the name, never heard of this guy before, figured it was some local guy who dropped his pick. So I get home and Google the name...HOLY CRAP!! This guy can play ANYTHING!! Amazing guitar skills and he seems like a nice guy. What's the chance that a guitar player drives to the mall and in the parking spot he pulls into there just happens to be a guitar pick there? Pretty crazy. Anyways, great vid, Brad, you're really stepping up lately!!

[@TheGuitologist]

Awesome story!

[@funeralbillii9172]

@@TheGuitologist Thanks, Brad!

[@stevesalazar9658]

Had the pleasure to meet Johnny at NAMM a few years back. He is absolutely every bit as kind & humble has you see here in person. He's just a good ol' boy & you'll never hear him say a negative thing towards anyone. He seemed appreciative to have the change to chat with me awhile. This is the type of person who defiantly deserves every bit of success he achieves.

[@MrMisterock]

This is a fine video about two very fine people. God bless you guys for what you doing.

[@MrGTO-ze7vb]

Great pickin Johnny..!! That MM amp has fantastic tone options..! Thanks Brad

[@rockroller1829]

im very impressed .. most guys gut these old amps for no reason but to modify them and they are never the same !!! great job to you. your awesome !!!

[@Mojoman57]

I don't know you, man but I couldn't be happier for you. This was awesome.

[@50gary]

At about 36:37 I thought I heard a bit of Danny Gatton's Harlem Nocturne ( cover of Duke Ellington), at least in tone? I wish Johnny would cover that song it's a master work by Danny G. I'm stinkin' awe struck by Johnny, thanks Brad for a great video, well done. You're hooked up now.

[@RobertBakerGuitar]

What a cool video!

[@movinginstereo40]

That built in phaser. Jeezus, I could waste a whole day exploring the whole spectrum of sound. Love it. Thanks for the upload, what a treat.

[@orvilfarley7861]

Can't believe I missed this one!! How cool that you got to meet the dude. I mean geez, whats the likelihood of repairing a Piece of equipment for a famous guitarist and then getting him to demo it, and Icing on the damn cake when you can show him something that he didn't even know about his own amp. Great video Brad, Almost as cool as building a dulcimer with your daughter. Keep it up, even though youtube sucks!

[@stevea9766]

Great ending! That's not taking away anything else from the video.

[@TetrisShark70]

Love the "Sue This" sticker, fight the good fight man! 👍

[@goodun2974]

You have the schematic, but what you don't have is the *board layout* diagram. It's common for 70s and 80s hifi service-manuals to include a component-layout drawing, but typically only for the *foil* side of the circuit board, not the component side; and some manufacturers didn't bother to silkscreen the component numbers on the board itself next to the individual parts. Makes the process of troubleshooting a malfunctioning stereo into an exercise in frustration!

[@larrydrozd2740]

I've been using Music Man 100 RD amps for almost 40 years. Heavy rock, clean blues, heavy metal....its does it all.Plus it will clean up and sound amazing. I run it through an EV 12-L Speaker . I made my own cabinet for my road amp but one of my back ups is the stock two piece version. These amps are amazing....and a nice, well kept secret.

[@efenderbls]

This was awesome and educational thanks.👍

[@tubical71]

Driving a power tube from the cathode, is a clever thing,as you don´t need to superimpose the negative control grid bias to the audio signal, and also you don´t need much voltage swing on the driver, but you need current, that´s why they used power transistors, you can easily supply curent with transistors....creating a large voltage swing with a superimposed negative DC voltage is another story.... Also have you noticed that the output stage is directly coupled? It seems that they also use the cathode to bias the tube ;)

[@TheGuitologist]

Great comment. And yes, looks like there would be some bias on the cathode too. Neat circuit. For guys demanding clean, seems like this is about as good as it got for the time.

[@duncan-rmi]

this architecture makes it easier to apply the high/low power modes too. starting to see this approach in 'boutique' studio heads.

[@jcmusic724]

I have an Rd100 and this was the best, most detailed look inside this style of amp I've seen! AND amazing to see Johnny at the end. thanks for keeping it up here

[@franktizzoni]

Lovely video, your work and Johnny Hiland, nice blend!

[@larryjeffryes6168]

SS pre, 4X 6L6 power, with built-in phaser ... sounds like Peavey VT & VTX series amps - hmmm a little delicious.

[@auntjenifer7774]

Yep had two of them an old classic and a behemoth Peavey Heritage VTX lot of stamp I've ever owned louder than any Twin Reverb 140 Watts tube just gnarly don't forget the phaser

[@wesmatron]

THE Johnny Hiland!? That guy is a guitar legend

[@bluelightproductions]

My MusicMan used to over-heat all the time, but I was gigging in the Virgin Islands and the power was brown and spikey. Once I put a fan in it and bought an expensive Triplite power conditioner/battery thingey, it never gave me any more trouble. Great pedal platform. Fuzz Face and Memory Man. That was a long time ago!

[@LanceJean02]

Fantastic video! Very nice video of Johnny and his reaction to all of your hard work!

[@WillyMcCoy50]

Always like the MM's. Had two twins that I would run through a stereo delay. One on the stage left and t'other on stage right. SWOOSH! The wiring on that one was text book mil spec. All bent at right angles. Doug would freek!! Super nice amp! Johnny Hiland is a fantastic all around fella. Was hoping you would do dueling flanjo's with him. Great video Brad!!

[@stargatewv]

Splits wattage in half by using 2nd in put jack of channel. 150=75 watts as you probably know by now. I'm in a parallel universe right now.

[@tomjones2348]

Amazing video! Fascinating. Johnny had this amp for all those years....and never even knew about the push/pull on the phaser. Wow.

[@joshuaweiner6378]

Fantastic stuff, Brad! Love hearing Johnny play.

[@evanwilliams8908]

"Sue this". Lol

[@multishit6664]

LOL that sticker is hilarious.

[@fishhooks100]

That is some mo' funny :)

[@acidfilth2007]

Easy to miss but that's a nice cherry on top

[@hearpalhere]

I chuckled when I saw that too! :-)

[@TheScottJeter]

I like it too. Funniest part to me of the whole play authentic fiasco is that a company can't sue you for using/showing their products.

[@jasonlee8497]

Damn, I've learned a lot about amps on this channel....could just about have a serious conversation with a pro....

[@sthomasIII]

Very nice! Thank you for the walk through on this amp. This helped me repair a Musicman 75W. It's nearly identical to the one in your video except mine has only two tubes. This amp was presumably affected by a lightning storm and was not producing any sound. Only a mild hum that would not change with the volume. I found one of the TL072 op amps was shorted across the VCC. This drew down the entire +16/-16 power supply circuit.

[@tenlittleindians]

I purchased a Musicman amp new in the 70's. Mine was a dual speaker amp cabinet like a twin reverb amp from Fender. The high low switch let you get a cranked overdriven tone without blowing your fans out the back door of the bar. I rarely ever needed the high setting as that thing had serious output!

[@63stratoman]

This amp seems really similar to a Peavey Heritage VTX I once had. Similar circuitry with a built in phase shifter, dual power switch, and 4 6L6GCs at the output. Built like a tank! And the phase shifter circuit had the same exact feature (Freezing the oscillation) as well.

[@jasonrobinson5854]

Yep. Ya beat me to it. I still have mine bought new in the 80's. Wonder who came first with the integrated phase, Hartley or Leo? Maybe ill get around to sending it to Brad.

[@tombaker8045]

i have one of these. love the waylon=phaser in it .

[@63stratoman]

Jason Robinson it was way too big for me. I mainly played bass and with two Black Widows, it weighed a freaking ton! Great tone though with tons (perhaps too much) of headroom.

[@jasonrobinson5854]

@@63stratoman Definitely Military grade including the weight!

[@DrGonzoChronic]

if you're taking requests, I'd like to hear Rumble by Link Wray.

[@L.Scott_Music]

Clicked on to hear Johnny Hiland and ended up learning something about amps. Thanks!

[@davelafaro2174]

Oh man. This sounds delicious. I had a Musicman HD120 years ago before I really got into gear and lost it when a bandmate's car was stolen and burnt out. Still hurts to this day, I'd give anything to have it back!