Tube Amp Archive

Joe Bonamassa has added this amp to his collection.

In 2009, I built a guitar amp for my nephew (in high school). I got the AO-35 from Bob Schleicher (RIP), the Oakland, CA Hammond organ super tech. I had done work for him for years (Leslie solid-state relay). I told him there were people converting AO-35s into guitar amps and selling them. He was wa...

I have some Littelfuse 2AG (5x15mm) axial through-hole fuses I was intending to place in series with each leg in the rectifier chain. They should never blow in normal operation. If they do the amp would require servicing. Of course, without them it would require servicing also, only for more $$ if a...

I am now starting to attach wires to the assembled boards based on this layout and this schematic (both in this thread). I sort of expect that the layout is correct. That said. the schematic appears to have some small errors. The two tube sections are reversed for V1 and V2. Maybe this doesn't matte...

I have bought four with no issues. I would pay more if they were physically more rugged and would prefer them to be so.

I see the Brown Note amps website has been updated 2015 and includes a lot of new amps/options I have not seen before but the forum is down. So that must mean these guys are getting their kits or able to order them? A month ago or so I inquired and had some email back-and-forth about a chassis and ...

I just did something similar with a 2nd gen. Obviously a jumble of several eras but it works. I do PABs with a tail resistor rather than the lift (little blue 10-turn on the relay board). You'll have your own opinions there That's interesting. And it appears to remove a bit of the the load on V1 ca...

I am planning a 3rd Gen into a cepedals chassis and want to use the PAB feature. I hadn't seen one of these so I sort blended a couple of schem's and had at it. It seems pretty similar to the #124 schematic but R25 connects to S2A rather than S2 common, which seems to be a standard connection for PA...

Leslie 122 reverb amp uses incandescent to limit drive into the tank, paralleled with a 16 ohm speaker voice coil. Light leaks from under the chassis when cranking it!

R.G. wrote:Come to think of it, why *don't* I go make these to sell??

PIC12F1571 for example, 8 pins, four 10-bit ADCs, 1.75 kbytes pgm, 128 bytes RAM, 128 bytes EE, internal oscillator, $0.66 in singles.

Mosfets do sound very tube like! but for this I do not like the greater frequency range they drive the pan with, I like the sound of that small OT rolling off the bottom and top range like it does for the most part! It does use a conventional reverb transformer so there will be some bandwidth limit...

Today it is back on sale online.

RadioShack is bankrupt. Yesterday the 273-1365 transformer, commonly used as a relay supply transformer was on sale on line for $4.99. Today they were all gone. I found two at a local store and bought one. The other was a staple-up return package and looked dodgy. Maybe I should go back and buy it a...

Back in the day we used to call that "dead bug". I've made a lot of brassboard circuits of RF/IF, even high-speed digital stuff that way up to 200-300 MHz. Short leads, good grounding. Solder up a G10 box on top, paint it, done.

I just got a CE chassis today. Very nice. This indicator also is .3125 dia. (5V incandescent) https://www.alliedelec.com/search/productdetail.aspx?SKU=70152565#tab=specs Pricey though, lens and bulb extra. [img:400:267]https://lh6.googleusercontent.com/-UanL1JOhcrk/VLBSB2b2HwI/AAAAAAAAEkw/ZeajXEzfhV...