The Amp Garage

Found this method - Measure dc voltage either side of the 100K plate resistor (pins 1 & 6) divide voltage drop by resistor value, measure dc voltage at the tube side of the 1.5K cathode resistor (pin 3 & 8) again divide voltage by resistor value. Connect a 4ohm dummy load to the speaker jack, apply ...

I have a very basic tube tester, please expand on possible testing. So that 81 on the bottom is
a clue yes?
Thanks A

Hi, if anyone can kindly help ID his tube? 12AX7, maybe you recognize the graphics?

Thanks, I'll go for it.

Best A

Perhaps you have seen what Psionic (Lyle) goes through with this issue. An alcohol lavage and meticulous removal of the residue that builds up on the wax boards can be quite effective. Then there is the under board that gets polluted. I have pulled that board out on my silver face champ and done the...

Have fun with that. I just happened to fire up my 64 Tremolux for first time since the pandemic, good lord that Fender sparkle and chime and such a lovely trem. Some magic in the enclosed 2x10 cab as well.

When I am gone and dusted, will my grandchildren be able to buy tubes?? Better stock up for the generations.

Big congrats - go get em. Well deserved.

Ange

So this is a bit of an experiment, I am sure it's been done somewhere. It's a 70's Silverface Champ. I simply want to up the output a bit and give myself some tonal options and it needs to be reversible. 1. New WHS 8" w/ Ceramic magnet 2. Swap out the 100k plate R's for 220k 3. Up the 12ax7 CR to 3....

Thanks Martin.

Nice project, cool kid. I'll bet he is gonna soak up a lot of know how from you. The Kingsley stuff is great sounding. I'll be looking to see if anyone attempts a knock-off, jump on the band wagon. He uses a converter to get from 12v to 120vac to run the tubes and more typical voltages of from 150dc...

Mellotone DF6000 - So this stuff is close to the Fender original? I need to re-cover my old Tremolux 64' which is in poor shape.

Some of the grill stuff is plastic and degrades, is this DF6000 an actual material weave?

Ange

Thanks Martin, I know you have built a number of pedals with PNP. Did you settle on a 'magic' hFE for the Q1 & Q2? I have built the Fuller model (other as well), it's nice to have the contour and bias knob in addition to the vol and fuzz. It's that rolled of vol on guitar that killer. Also wondering...

Mikante, I just want to add and encourage you to try some speaker options. I am running my silver face champ into my 2x10" 4ohm Tremolux cab (1964) and wow what a difference. I had a WHS speaker 8" in there and it's ok.... but the cab with 2x10 is just another world altogether. I also have some home...