The Amp Garage

OK, so to get my terms right, a hot bias is increasing the plate current and a cold bias is lowering the plate current. On current production tubes the 70% dissipation rule seems a bit high for these, right? That's why I was surprised when my TAD 6L6 blew. I guess it was just a coincidence, because...

I've been shocked so many times I realy can not count them. My first was when I was a kid and stuck finger my between the terminals on a plug when it was still half pluged in the wall. The worst was when I was working in a poorly run textiles plant. I had shut of the new disconect on the blender but...

skyboltone wrote:
The other thought is to give the thing the full three knob stack with trimmers inside and set everything a little fuller with the knob on the front being the treble control.


Dan H

I think I will do this but turn the tone control into tweed Bandmaster type presence control instead.

Does this sound more Dumble like? I used my Epiphone Casino this time and set the Princton EQ for the OD and used 1uf for both OD cathode bypass caps?

I do not feel anyone is critical just trying to be helpful and it is thanks. I do have a .01 on the top but may be I will go back to the tone control now that I have changed everything else and see if that could help. Where could I find some dry sound clips of a Dumble to get a good idea of the tone...

Well I have made changes from some suggestions made by some of you kind folks. The cathode bypass caps are now 10uf, 5uf, 5uf, 1uf and 10uf. The coupling caps are .02, .02, .02, .01, and .02. I changed the tone stack treble cap to a 220pf CD and the snubbers are 270pf CD because it is what I have. T...

Here is some sound samples of the OD first 6L6 then EL34.

Well here are some clean sound samples I made with my 1985 62 RI MIJ Tele custom. It starts with the neck position with the 6L6 then the EL34 then on to middle position 6L6/EL34 then bridge position 6L6/EL34. All the settings are the same and both sets of tubes were bias at 25mA per tube at 425V.

I think V1A 5uf, V1B 10uf, V2A 5uf, V2B 5uf is a nice setup to help with flub. while still retaining some of the fender character. I've have 25uf-(5uf)-5uf-5uf-25uf and it seems better and it has close to the same frequency responce both clean and dirty. I changed to the (5uf) from 25uf. At first I...

Well some of it is dumble. I realy like the clean tone of a Princeton reverb amp and I had build just the OD section of the ODS which I liked alot and used it in front of amps with good results. So I decided to build one with a Princeton preamp and phase inverter with a dumble OD. I used a deluxe OT...