The Amp Garage

I'd definitely go with Martin's bipolar supply. It is a big improvement over the hand drawn schematic. It doesn't really matter much how others do it. The setup with the anodes of the CF connected to the screens of the power tubes just does not make much sense if you build an amp from the ground up....

ynor wrote: ↑Sun Feb 04, 2024 4:06 pm Don't know how I can repay you other than letting you know the results of your suggestions, and I sure will.

That's enough for me . I learned a lot I know about these amps on this board and am happy to pass that knowledge on again.

Raoul Duke wrote: ↑Sun Feb 04, 2024 1:17 am Can’t decide which I enjoy more: playing my 102 or starting a new project. Guess I could do both…

You're in the right place if this is what is on your mind haha. Would love to know how your mod works out.

Here ya go. Change the resistors with the green values to what is in this modded layout and that is what gets you the low plate amp. Like Martin said: anodes should be around 200V for V1, 210V for V2. 180V on V1 still sounds good, just a bit different. I wouldn't fuss about it at this moment. Changi...

Indeed, 100k/1k5 on both triode halves of V1! Also definitely not a skyline tone stack. #60 definitely is a skyline tone stack. You can even read the pot values in some pictures: 250k, 250k and 500k (with 1n cap) in the original. But if the ODR is what you like, you'd probably like a #124 amp before...

Trying to match the original as close as possible without having the amp in front of me. Ever noticed the 'O' in 'volume' is different from the one in 'low'? Me neither haha. The screen print on the original amp doesn't line out perfectly either. Around the mid switch the dots are closer to one side...

I had those tall ones, directly from TAD. If APEX checks these and burns them in, he might be the much better option. Not the first time a set of TAD tubes failed me. Not meaning to sound sour, but keep an eye on them is all I'm saying.

Hey, that’s very enlightening rootz! Thanks for doing that! It really identifies the subtle differences in a visual way for novices like myself. I’ll definitely study these and figure out the best one for this project. Very much appreciated! Martin, here’s my interpretation of the bass pot schemati...

Damn, I would hang that chassis on the wall and just stare at it for days. How are you liking those rebase tubes by TAD? I recently had one fail in a quad in a new amp, some nice fireworks inside. Already had a bit of discoloured glass before installation, but I thought they would be good to go. I w...

For experimenting with different parts I'd go to Tube Town in Germany. They have got 6PS caps at reasonable prices, they also have Vishay/Dale RN65 resistors. I think you can find there what you need. 6PS caps tend to be expensive at Mouser. Thanks for that link man, haven't seen that before! Resolu...

I hear you. I never really bonded with the skyline tone stack for that very reason. Great with tele's and humbuckers, but not what I like for a Strat. I found that I do like high plates with a Strat, but I also like my amps a bit darker with less sparkle than some others do. But give the suggestions...

Found it. But can't see OD trim of the AN ODR Only the ones who have been inside the AN amp know for sure, but safe guess: 100k as in the original #60. That is what's in the layout indeed. The pic is of the original #60. I haven't seen any inside pic of AN's ODR. But keep in mind, there is not just...

These are some of the variations of entrances I've seen and two that could be done in your amp. Those two do what Martin said if I understand him correctly. The first of those options is the easiest one as it requires the least alteration of what already is there. It also can be adjusted to be total...

So, here's the layout. Clearly visible are the voltages at the anodes of V1a and b. 180k/1k and 130k/1k8 gets you very close to these voltages. 180k/1k8 and 130k/1k gets you to both at 170V, or thereabouts. The latter is not in accordance with the layout. Also, I added a closeup of the preamp. The o...

Absolutely beautiful work Ian!! Incredible to see even the correct relays (as well as all other NOS parts). That attention to detail gets me hooked on every single one of your builds. So this is a mix between #94 and #128 you said. Can you share what makes #128 what it is? For example: I see a cap o...