The Amp Garage

Thanks for all your help. I made a video of the from lean to mean thing it does so well.
https://dvbme.com/pics/Video/Lean%20to%20mean.mp4

Turns out the 20uf cap on the left ground was needing a bit more solder. Thanks to sluckey for the guidance.

A good filter cap will be room/ambient temperature. A cap that is passing current will be warm of hot. While probing the 20uf cap on the left i heard crackle, chopsticked the cath and lo and behold looseness. more soldering, now no crackle. i just need to get a practice for three hours and test the...

I'm using it through a v4 cab 8ohms one creamback 75 amongst the eminence 50's with a drummer on the third hour it gets the outside of the power tranny hts-9144 62c i put a fan on it and it keeps it to 50-55c. so last night i took it out of it's shell and played through a single 16ohm 75w for an hou...

So the rocket i built sounds great but gets to 62c after a couple of hours or faster depending on the volume i use it at. I'm assuming that the NOS Mallory, CDE caps i bought off ebay 40uf-450v and 20uf 450v might be to blame. can i test this or might something else be wrong?. i used the BOM and lay...

Thanks so much. I played for an hour and it was phenomenal. and the transformer was still cold. got me wondering why the rocket i built power transformer gets so hot 62c after 3 hours.

Well that helped a heap. wow.

well i put them in and go a squeal no sound otherwise. turned trimmer till it stopped at -038 still no guitar tones

i'm using pacific trannys. i put in the 150k and changed the 10uf-100 to 10uf-150 and the pin5-1500 to 1w
and now have -035vdc.

I can't seem to get above 30. I've tried the 150k resistor but no change mostly 20's. went back to 220k I'm using the Bourns 3329H-1-253LF 25k wondering if using the 22k might work?

Yes 12ax7s. no el34s yet, so how much lower?

I built an express as per RLW1.8 but get a 0Ma bias. v1 1-188 3-1.62 4-3.25 6-168 8-1.2 9-3.25 v2 1-235 3-2.41 4-3.25 9-3.25 v3 1-181 2-22 3-33 4-3.25 6-180 8-32.8 9-3.25 v4 2-3.1 3-349 4-345 5-0Ma/-20vdc 7-3.1 v5 same bias 0Ma control grids pin5 -20vdc Pam-Ot PRIMARY: 7.5K Ω CT POWER: 30W Pam Pt YE...

Finally done.

I have a buzz whether vol or not. C6 .047 is microphonic Went to 716p. still buzzing and seems to be expressive of a ground leak? putting meter on pin 7 of PI silences the buzz.

On the layout it says preamp resistors could be 56-68k and on the power section it could be 100 ohm or 470 possibly 1000.