We were selling those on Craig street in the 60’ in Montreal at Golden Music. They don’t sound good. Muffle sound. I’m a Fender guy. Robertson screws are the best… you need the proper screw driver but. I got one 725 for 2 bills, change the power transformer @nd turn it into @ 5Y3 Tweed Deluxe.

Erm yeah I’d stick to servicing them

It’s real close to the 100 watt schematic I sent you. Except for the tube differences, I love the 6GT5. Do a video showing your work.

Nice!. You have that same tube configuration in the early 60's Watkins/WEM Dominator family. I've got one, a Mersey Super 15.

The most beautiful crystalline overdrive sound I've ever heard was from a Masco MA25hf, the sound of that amp haunts me!.

The more powerful amp (I have a '67 blackface drip-edge transitional "50 watt" - more likely less) sounds better, the bigger iron and more power tubes gives it a more solid sound even at low volumes. I recently got an AC15CH, and wish I'd gotten the AC30CH for that reason. Nice score man!

Amazing conversion Ron, you got it right on with the overdrive!. I've got a '56 Masco ME-27 getting converted right now in a fellow youtubers shop here in the UK. This is the sound I'm looking for, harmonics on top of the drive!.

Ron, nice work as usual!

I just picked one of these up. How do i connect a speaker to the terminals? Does the negative go to "C" and the positive to 8ohm if it's an 8ohm speaker?

Always loved the picture you have of Jerry there in your bio... . Always was curious how they used Macintosh amps for their guitars. I mean I get how it was a PA. But surely they used other amps as their main amplification for the guitars and then ran to the PAs. Or did Jerry like run from his midi guitar into the board and straight to the PA? Any idea? Only brought it up because I saw your picture of Jerry in the bio

I took one of the 100 watt versions and put a deluxe tone stack init and man you talk about nice. good treble. good bass good volume.

I un-ironically love the ghetto method of pressing the resistor in to the eyelet with a chopstick to "turn it on".

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Honestly this amp sounds anemic, who said ths amp was a fire amp?

Sweet Demo!!!!!!!!!! Taser Playing. What a pedal platform, I'm going to guess it has a Drake style OT and not a Radiospares.. Thanks

IIRC, the "Falcon was the model name for the GA19RT or RVT series.. There is very little circuit continuity between examples of a given Gibson model, and therefore a whiteface, chromeface or "woody" GA19 Falcon are all different and might not match the published schematics either. PS, the reverb tank, if not original, may have been erroneously replaced with a Fender-style transfomer driven reverb tank ---- but Gibson often used a capacitor-driven circuit and so a Fender type tank wont work.

S-60 and S-100 are great amps to tinker with. Clean easy to follow layout. I've changed the front ends on mine a few timeS and haven't killed it yet. That's saying something.

I feel like it'd be pretty said to see such a unique amp turned into just another jcm800. I'd keep the bones stock and see what you can do to make the controls more useful for guitar.

Is it one of those valco amps with a different name?

Remote switch foot pedal switches the channels.

7:56 __Спасибо за игру👍👍👍

She's a real beaut! I bet she'd make a great bass amp. The OA2 is a voltage regulator. I can't find an exact schematic for the S100 online but a similar one seems to have the OA2 regulating voltage for the power tube screens. How it does this is a complete mystery to me though - the cathode is connected to the 6.3v center tap and the anode to the B+ center tap. This is above my pay grade for sure. Would love to know how it works though. Great job, Ronnie!

Sounds great! Why the ef86 in the circuit? Is it the preamp tube and the 6sl7 is the phase splitter for the push-pull 6v6's? Killer project!

Should do an update on this amp. I have one also and would love to know more about it

Please tell me what the impedance switch does in 5 year old terms

I'd love to see what it looks like under the hood, and inside the chassis. I have a big Webster PA amp that needs to be recapped and converted for guitar use: it has two 5U4 rectifiers, four 6L6GC's, three 5879 pentodes for mic input (as well as one octal tube phonograph input), a weird tone circuit with small inductors, and a 6SJ7, 6SL7 and 6SN7! I couldn't find an exact schematic for it online or in my large collection of Sam's PA amplifier schematics, but I did find a schematic for another brand of PA amp with a somewhat similar circuit and tube complement, a Dukane I think it was. It probably should get a new output transformer however, because the multiple secondary windings and taps aren't marked and the wires are discolored from age, and so it's a confusing mess. I could probably figure it out with a multimeter if I had to but it seems more appropriate to put a proper output tranny in there with 4, 8 and 16 ohm taps.

Late to the party but I have the Mark IV with two 15 20 cabs I bought in 1993 and still going.

Ducane (Operadio) invented high gain amplification. Ducane invented the master volume control. Mesa Boogie: is a johnny come lately.

Ron, I have a AO35 that I did the same thing with following Brad's video with a few changes. I'd like to add a MV so could you tell me what circuit you used?? Post phase inverter or pre?? Any help appreciated

I have 6 of these. I bought a 1969 bandmaster chassis without transformers and dropped the Dukane transformers into it. Sounds like a Dukane Bandmaster, both have 6 preamp tubes. I've turned 2 of the Dukanes into Bassmans. there is a lot of potential. GOD BLESS YOU! GOD BLESS AMERICA!! GLORY BE TO GOD!!! IN JESUS NAME WE PRAY!!!!!!!

wow that sustain...

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WOW, I had one of these back in the 1980s! A family friend modified and gifted it to me. Said family friend owned the local TV Repair Shop (remember those). Really, Really Cool to see one of these again. 👍😉

It is great! You are a genius. 😊

I hear a lot of the guitar playing with the Boston song More than a feeling....

What fuse does this amp use? I have one I’m trying to sell but the fuse & cap popped out & can’t find a lot of info on it

I’ve thrown together a couple of those Hoffman 6V6 Pexi’s for people. I’m always impressed with the sound, but never seem to build one for myself. I need another tube amp like I need another hole in my head though. That Hammond power transformer seems a little small from here. Didn’t it used to run 6BQ5/6V6’s?

Always tune your guitar before making a video. Was hard to listen to.

Hey Ron Nice amp and worth to be restored! The toggle switch with the high and low position actually changes the voltage . In the high position you probably can reed around 700 Volts on the anodes of the powertubes. I had one of these on the bench lately. Maybe you want to watch this: Music Man RP 65: Repair, analysis, bias setting and sound demo kzbin.info/www/bejne/qn60dJlsd9Nmg8k Greetings from Germany

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It looks like you started with a Hammond AO29 and gutted everything except the power transformer and chassis

I like the way the tails sound on this old gal...

Would love to see someone like yourself capture these amps in a modeler like the Quad Cortex. That would preserve the sound of these amps( and Terry's sound), which are very hard to come by and often would need a ton of work.

Methimks your 'auto-focus' is having a case of shit conniptions...(?) (...ha ha I just noticed your text ) ...mayhaps some coach horse blinders (?) I'm digging some of your tones and I like the tube type rectifier... Seems a lot of blokes have found success with Hammond conversions

I’ve blown up two of those AO-29 power transformers trying to run 6L6 tubes in a Thunderbolt build. Had it in an open back combo and the transformer would overheat and drip wax out of it, eventually frying it. First time I thought it was a bad transformer. Second time I knew something was up. The fix was to run it on 110v mains and install a small fan blowing directly on the transformer. Power transformer #3 has been running perfect for 5 years now.

Sounds amazing

I’d love that thing

Man lucky 🍀

Were you able to find filter caps for it?

ОТЛИЧНО. МАСТЕР👍👍👍7:53_____👍