The Amp Garage

As the title says,

I have Fulltone Fulldrive 2 in great working condition.

I'm willing to trade it for a Keeley MK3 driver or perhaps even a Keeley Muse driver since they are the same circuit with only different names.

Phil Donovan
Donovanphillyboy@aol.com

Hi there and thanks,

Can someone elaborate a bit on what may be the implications of grounding the preamps either to the main B+ filter cap cathode vs the 1st stage input filter cap cathode? Thats something I struggle to resolve in my head.

thank you,

Best,
Phil D.

Hi, While the recommended grounding schemes are beginning to make electrical sense to me, I'm still not understanding the "from preamp ground to chassis" considerations - the how, where, and why it is placed on the chassis. I'm taking it that there would be a benefit over a floating preamp ground, w...

On soldering pots, On my three amp builds (cleanish pedal platforms, all are very quiet) I either set an 18AWB solid wire on and along the preamp section of the board wiring from that to the ground lugs of the pots Or, set the 18AWG solid wire hung from the lugs of the pots say, a half inch out susp...

Wow, I'm impressed. And humbled. Thank you for giving some sight to the partially blind and giving me a great starting point, and possibly ending point. Although my 3 amp builds have all come out great and very gig worthy, I followed classic layout to be safe thus, never ran into any hum, hiss, nois...

Ha, interesting, and if doing DIY and not having the weight of saving pennies on the dollar, then its not terribly much more to have one more triode for a differential input. If I knew a little more about confguring tubes I may be willing to do that. Well, the first stage of this amp seems to be lik...

Thank you for this RG, everything you mention hits it right on the head to my concerns as much as the limits of my understanding can take me. What's a little different about this amp is that it will truly be two full amps in one chassis including separate power transformers for each amp (amp left, a...

Hello, thank you for coming by. You may have seen a couple of threads on some crazy person building two nearly independent 20W plexi's into one chassis and cab. Yeah, thats me. I'd be interested in hearing what your notions would be on consderations for input grounding. I can imagine there are a few...

Thank you for giving me some good things to think about.

I'll be putting these approaches to good use!

Best,

PJD3

Thanks pdf,
By what you say, it sounds like both an electrical and an acoustical component coming into plays and not just one or the other.
Best,
Phil

Hello, Curious a bit here, If (and when) there are two identical amps (20 watts each into their own 12" speaker side by side in a combo), what be the perceived volume when both sides are equal with same signal? (6 dB increase twice the watts? Thanks. Somehow I recall perhaps a 6 dB increase. Best, P...

Thats interesting Roe, I never thought of that. I do find it useful to mix in a lttle normal channel volume for some added body and fullness, and from time to time when using very bright/harsh overdrives its very useful for compensating for that - turning the bright volume way down, and the normal m...

Aw Timbr, It would be a tempting idea if all the holes weren't already drilled for pots, switches and power lights! Plus, I really prefer the start of the preamps at the Mid/front of the panel. If I didn't drill those holes and somewhat commit to the panel layout though, that would be the sensical t...

Thanks all, And Sluckey, it is heartwarming to see that amp with the nice little PT"s at each end out of the way. You may have missed that that was my original plan (and still may be) but, I"ve opted to seriously consided putting a single and bigger PT in the rear/middle of the amp, as I can save mo...

Thanks Phil, I'm not really interested in changing layouts unless necessary, if for some reason something isn't working I'll change it. My concern is if 8" is generally too close to expect no issues near inputs. One advantage to 2 PT"s s that if say, a power tube had a bad cathode to filament short ...