The Amp Garage

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...

I only have one fuse, 3 amp slow on input power. In Operate 118vac wall voltage 320-0-322 vac secondary. 320vac leg is also feeding bias circuit. B+ 414vdc Bias -360vdc at 5mA PT's biased to 27mA with -49 volts. if this is in operation all looks ok.. temperature is ok also little bit hot, 45 deg C ...

Usually power transformer is last thing to fail..almost impossible in good wound transformer.. Also fuses should be burned before the transformer..

Hmm it is strange thing.. Does PT has normal voltages in operation? Pls retest IN OPERATION all the voltages, and write here.. If they are normal, and current consumption is normal.. And transformer is hot.. then is undersized for this application..

otherwise, making only V1 DC supply for heaters is simple.and cheap(7812) and fixing all of the problems.. V1 matters only, sometimes V2

the problem in the power transforner should be overtaken by making electrostatic shield between secondary and heater winding, which need to be located at the top (last winding), and gnd this winding

Lead dress is causing oscillations in higher gain... oscillations are positive feedback, and cable connected to sensitive grids is acting like an antenna.. Whatever this cable picks up, it is getting amplified. grid is multiple turn of small wire so it is real antenna.. In guitar amp there are many ...

for the added fuse, check what is this and why is there