The Amp Garage

1. internal tube structure problem, some bad assembly, then arcing internally..

2. on sockets because of flux between in 2 and 3, which with time strting to be conductive.

3. because of bad sockets, porosity in materials and humidity

Me too. But prices are too high... so i changed, i have luck nowadays with axial TAD Mustard caps (probably also chinese, cheap, but sounding very nice), looks good too

edit, this post on top is for working amp here is major problem short circuit to the ground on Ub+ line, so new procedure: 1. switch off the amp 2. drain all the capacitors , with 10k to the ground until discharges 3. multimeter in ohms, and touch every node on + cap and to the ground, find out whic...

1. remove feedback wire from the speaker terminal

2. start amp again

3. if there is no any noise and amp works, switch off

4. change anode wires from OT to pins 3 - sockets, A1 <-> A2

5. start amp again, verify all is correct

font , colors, quite bad printing and shape looks like Sozo

1mV AC balance on cathodes? this is negligible... also 2mV is negligible (impossible to hear that), i would leave this like it is

Maybe the 12-65 Creamback, but the AlNiCo Creamback is anything but dark. Alnico Cream.. i have 2 pcs.. also is not bright too.. playing this speaker last 2 years...now is too smooth.. sound is great. Saying that will be good to try Neo Creamback and Alnico Cream in 212 box, probably they will make...

Sockets are how i see new.. and Belton, so means high quality.. Never failed any in my life. So there is only 0.1% of chance that sockets are a problem.. Probably output tubes..

This is bad tube problem.. pls measure resistance directly on the tube pins, between 2-3.

Its a shame you can't get 220uF in non polarized form in a non gigantic form factor as that would be the easiest way to deal with this problem lol. I Now i see you are too young and green.. it is ashame that you dont know this :mrgreen: : 220uF is very easy to make, from 470uF + 470uF regular elect...

Creambacks are little bit dark... Neo Creamback is maybe the best to my ears (i had all od them)

Thanks for all the replies, I'll try to address everyone's points in order: -Electrostatic shield would definitely be effective in combating this issue. Unfortunately I don't know of anyone making off the shelf PT's with them included. I'm at the point now where I could fairly easily design my own ...

it is ok.. also there is wide range of usable impedances for all the tubes.. nothing to worry about..in datasheets yu can find distortion vs load impedance , this is changing, also little bit he character.. but is it ok

PP or SE?

I had the same problem in one amp, when inside the box.. chassis and power transformer were extremelly hot.. while outside on the table, chassis and PT temp was just moderate, nothing to worry about... Then i discover that there is no sufficient air circulation in the cabinet, and tubes were heating...