The Amp Garage

i am moving this topic to another board. thank you for the help getting to this point it has been very helpful! i probably wont be checking out this thread anymore

i need 5 x 20 fuses those are 6.25 x 32. maybe i could cram one of those in there?

Negative bias voltage on pin 5 is -57 for all sockets Yup the small 500ma 600v fuse was blown in my meter... doh! Brand new meter wonder how that happened could that plate current measurement have blown it? Looks like the Klein replacement is unavailable on Amazon. There are some similar 500ma 5x20 ...

ok I have some test results: - voltage plate/pin #3: ~454 on all sockets - voltage screen/pin #4: ~455 on all sockets I was unable to get the plate current because I might be seeing some weirdness? I tried 2 methods described at https://robrobinette.com/How_to_Bias_a_Tube_Amp.htm I was using where t...

ok yeah you know whats confusing here is that user pdf64 asked "I assume its the same for both channels?"... ok so whatever i totally understand what you are saying we can move on now .......

stevem yeah i understood your post the 1st read. your post mentioned "I assume its the same for both channels?". I was just letting you know your assumption was correct. thats it. I guess a little confusing how i worded it? Let me see what I can do with my multimeter and get back with some results

that schematic looks correct that is one i have for it. and no mods other than the work done i mentioned in my original post

I'll have to post later regarding any tests you mentioned... it is the same for both channels As far as test equipment I currently have a Klein MM400 multimeter. I can get some basic equipment from Amazon if needed. I'm thinking poor man setup: - Android function generator app by Keuwlsoft. looks pr...

So I've been struggling with this amp ever since I messed it up. I had turned it on without a speaker load hooked up and there was also an unused adapter in the speaker jack of the amp which didnt help. It definitely fried 1 tube maybe more stuff not sure? I put in new power tubes, filter caps and b...

thanks for the explanation. i was just thinking power supply not signal phase

ok thanks thats how i have them hooked up. if its not too complicated to explain just wondering what happens if they are swapped?

i dont feel so bad now i guess not that obvious the amp likes the ot black wire going to speaker jack tip. the other way squeals. hope that doesnt cause any damage? so the ot primary blue and brown are the same thing correct and doesnt matter which one goes to what tube socket?

i have a very novice question. i am replacing an output transformer on a 70's fender bassman amp. i have a new hammond 1750w replacement. it has secondary black (com) and white wires. i am not sure which wire hooks up to the positive of the speaker output jack on the amp black or white? any help app...

Looking to switch semi quickly between 2 OTs. I think one i have might be damaged and breaking up early. I would like to compare against a new OT. Any way i can solder up both OTs at the same time i guess that would be in parallel, and have 1 wire of each OT on a separate switch. So that would be a ...

any reason the OT has to be mounted traditionally to the amp chassis? The bottom and mounting holes of the old OT look painted. for the hammond replacement i was thinking maybe i could mount a piece of wood to the chassis holes and then mount the hammond OT (with different mounting holes) to the woo...