Tube Amp Archive

Thank you very much for your quick and very informative answers! During construction, I already installed the heating system as suggested here. I was actually concerned too, that the approx. 30 cm long wires to the tone stack could lead to muffled sound and vibrations. Fortunately, this was not the ...

Hello dear Fender enthusiasts, I built an amp head with the AB764 circuit (see pictures below). The only change to the original circuit is the use of a solid-state rectifier instead of a rectifier tube. I found that the circuit was probably used in the Vibro Champ, but I'm wondering where the name “...

first thing I would do is halving the capacitances C1, C2, C3, C5 and check if the sound goes in the right direction.
Then playing around with different combinations.

Could you please share the supply voltages A, B, C, D ?

I would say its a homebrew, with some later modifications maybe from the seventies if I look at the components.

From a electrical point of view, the resistor is ok, but it's like throwing caviar into a pig trough. As long as you make sure that the power specification is not exceeded (pay attention to the derating per ambient temperature) you can use any resistor. But the smaller the design, the higher the sur...

cbass wrote: ↑Sun Mar 24, 2024 12:27 pm .... I can't imagine any reason to use it for anything but sheathing on a house....

I got a lot of it for free

Because of the flash I power up my amps through a current limiter on the primary side, between the wall socket and the amplifier power cord. That also helps the input fuse and the input rectifiers and powers up everything including the anode voltages in a smooth manner… I don‘t know if all values of...

thank you all for your thoughts.
I think I will not use OSB, the possible desintegration because of use/vibration really seems to be an issue…

I planned to use 18mm thick.
the joints are glued and screwed together with a triangular strip inside as reinforcement

I would like to build a Fender Bassman cabinet with 4 x 10" speakers. Keep to the original dimensions, but would prefer to use OSB boards (Beaver puke) instead of pine. (these very coarse chipboards e.g. https://www.obi.de/p/5799762/osb-3-verlegeplatte-22-mm-mit-nut-und-feder-205-cm-x-62-5-cm ) Does...

Guys, I miss the salt- and fat-free steamed vegetables and tofu in your daily diet

look at reichelt.de… they offer some in TO-92 package, real cheap enough to try some of them if they suit your taste…
Search for „jfet“ on their site, than narrow down to „N“ type

a cheap way to protect the OT against secondary open condition is a MOV (metal oxyd varistor) just solder it directly over one of the output windings. and what about this simplicity, R=47R 5W permanently soldered to the output jack? :P you lose always power...and heat the atmosphere :mrgreen: the M...

a cheap way to protect the OT against secondary open condition is a MOV (metal oxyd varistor) just solder it directly over one of the output windings. The rated voltage approx. 2x the highest expected output voltage. They look like a disk with about 15…20mm diameter. The good thing with this MOVs: w...

beautiful, thanks for sharing !
Aus welcher Ecke in Deutschland kommste ?