TPA3118 60W Power Amp Module

While a "pedal amp" might be a great use for this small board, what about a variable power converter to use this to replace a dead output amp in a classic early Solid State head. Almost all of the early Solid State amps such as Silverstone, Thomas Vox (Vox USA), Gibson, not to mention high-fi amps from the same era, have a transformer driver and a "totem pole" stack of output transistors. If the driver transformer goes bad, no one, NO ONE, makes replacements.
I have used other class D boards to rebuild early VOX SS amps. The voltage levels work since most are single +VDC. I have replaced the power transformer with one with a current level but same output voltage.
So an interface board to bypass the "dead" early output amp would make this type of replacement fairly easy.
Michael
 
A real one in one of my pedal builds for comparison. 32-pin IC. Discrete components all the same. Fakes have a 28-pin IC and discretes are moved. In particular, C20 in the lower left is R20 on a fake.

RealTPA3118-2.png

And a fake. Note R20 and pin count. And no C20 to be found.

FAKEsmall.png
 
FWIW I just got these from Aliexpress. I was ordering other stuff and tossed them in the cart just in case they might be genuine. I haven't powered them up yet, but at least they have 32 pins?

This is the item I I ordered: https://www.aliexpress.us/item/3256807671722161.html
I'm ordering a few more, but I assume there's no guarantee that they'll be the same as these.
Those are selling for 99 cents right now at Ali to new subscribers. Hint, hint, to folks who want some... And only 2 bucks for for those of us who've bought from Ali before. I just ordered 10 because... How can anyone skip this? And I'm insane... The TPA3118 chip from mouser, for 10 of them, is more than this (with shipping cost). I have a PCB designed at PCBway to build these if they go extinct but they are surviving.
 
And a reminder to folks new to this thread... These need a good preamp to make a pedal board amp. I have PCBs to do this and I suggest using the volume-only version. And, they can also have an XLR installed, presuming you are using a cab-sim ahead of this power amp.

My build guide for various versions of the power amp pedal: https://drive.google.com/drive/folders/1iFa5Fe8ZB1ukfYn8xFxkUt--wFWA6nne?usp=drive_link

These pair really well with the AMT legend series II preamps. Three versions are worth trying out: E2; M2; O2. The E2 and M2 are great if you use a tube-screamer style pre boost with it to push the AMT clean channel and can push the drive channels into full metal jacket. The O2 is lower gain and is a very articulate, solid drive channel. My buddy uses a Sherriff (Bobby at PedalPCB) for metal tone into the clean channel of the AMT O2 and the O2 drive channel for hard rock (like AC DC). The cabsim out of the AMT goes to the power amp. If you want to build an AMT pedal, I have PCBs for that, too. We gig with these and guitar players are impressed... Sometimes shocked. If you build a Sherriff (Bobby), use 4558 or 4580 opamps, not TL072. Not a huge difference but it does sound better that way. Build with IC sockets and try it for yourself.

The combo pedal build we use to gig is in this thread: https://forum.pedalpcb.com/threads/...absim-noise-gate-post-boost.21199/post-268081

It has an AMT as the center piece and includes a lead boost (spark) and noise gate (Muzzle) and preboost (many options) and either a second drive channel or a reverb. We've settled into the drive channel we like so we both have a spin FV-1 reverb in our gig pedals now. That's the heart of our pedal boards. A combo preamp pedal and the power amp pedal with XLR out to the PA.

PCBWay projects that support all this: https://www.pcbway.com/project/member/shareproject/?bmbno=FA3E9302-C561-44
Feel free to order direct from them. I can sell some if you are in the US but it's cheaper to buy direct from PCBWay anywhere else.

As a note, I'm not in the business of selling PCBs but I'm willing to sell some things that are not available at PedalPCB, like the power amp, AMT and the alternate versions of PedalPCB things that I redesigned to squeeze into the combo pedal build. And, if Robert wants any of this to pursue on PedalPCB, he can have it for free. (This is my disclaimer for folks who are ready to pounce on me for redesigning some PedalPCB stuff.)
 
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