Tube Amp Archive

Hi bluesky, that sounds like a nice little amp with the Alnico. They are quite loud! For fun the other day I plugged mine into a 2x12 cab with WGS green berets and it can really move some air. -Dan It almost seems louder and have more bass than the 5F1 Champ I built with an 8" ALNICO speaker and 5F...

I modded mine by ripping out the stock tone stack and replacing it with a Tweed 5F2A tone stack. I mounted the pot in place of the low level input jack. I also used a Weber 6" ALNICO speaker and a thin brown grille cloth. It's quite loud.

I decided to replace both plate resistors and the cathode resistor/bypass cap on the 12AX7.That seems to have done the trick. After a total of about an hour playing and just sitting idling there is just a barely audible hiss. I'm satisfied.

Thanks. First useful response i have received. I can replace the 3 resistors in the input circuits quicker than more troubleshooting. They are all carbon or metal film already.

One of my amps has started making a soft crackling noise. The noise sounds like a combination of static and rustling leaves. The amp in question is a Weber 5F1 Champ clone that I built about 5 years ago. It is modified with a 5F2A tone stack replacing the low level input jack. Speaker is a Weber 8" ...