Post by thetragichero on Dec 22, 2020 23:43:59 GMT -5
just gonna paste from the thread i have going on tube amp garage forum:
picked up this off reverb with the intent to gut and turn into a monster amp
so right now I'm at disassembly and cataloging what to keep and what to trash. reverb tank tests good but one of the springs is detached without the little mounting bits. one of the screen resistors blew up, taking out the tube socket pin and this is a likely cause
musicians aren't human
my idea is to get a filament transformer so that i can run a quad of 6550s. with all the holes (and six preamp slots) I'm thinking two preamps (orange-ish for dirt and hiwatt-ish for clean) with high and low inputs and reverb on the clean side (may opt for 12dw7 since i have a couple hammond-pull gibbs tanks that have high input impedance). once i get the boards out and cleaned I'll draw up a schematic and figure layout. obviously replacing the output sockets since one is so charred
rectifier and doghouse board are fine, scrubbed with denatured alcohol. the main board is another story and not worth using in my opinion. i have a piece of vulcanized fiberboard from antique electronic supply that's the perfect size. am i correct in assuming that since there is some measure of rubber (hence the vulcanized name) that this is not susceptible to the same problems as the fender black stuff? i also have a fiberglass/epoxy board but it's shorter and fatter. i could use this but I'd rather use something that is the proper size (otherwise i suppose i could add something to an upcoming order)
chassis is covered white dusty-looking stuff that doesn't come off with denatured alcohol but my chrome polish seems to do the trick so i guess i know what I'll be doing while watching football with the wife
i hooked the output transformer up to ac and its measurements match up to another bassman 135 output transformer i picked up here awhile back so the ot is good. also tested the power transformer and that produced the expected voltages
so transformers check out, chassis is cleaned. waiting for more eyelets in the same order to finish my eyelet board, which i have laid out on masking tape that I'll tear away as i fill it (screw duct tape, i LOVE masking tape)
picked up this off reverb with the intent to gut and turn into a monster amp
so right now I'm at disassembly and cataloging what to keep and what to trash. reverb tank tests good but one of the springs is detached without the little mounting bits. one of the screen resistors blew up, taking out the tube socket pin and this is a likely cause
musicians aren't human
my idea is to get a filament transformer so that i can run a quad of 6550s. with all the holes (and six preamp slots) I'm thinking two preamps (orange-ish for dirt and hiwatt-ish for clean) with high and low inputs and reverb on the clean side (may opt for 12dw7 since i have a couple hammond-pull gibbs tanks that have high input impedance). once i get the boards out and cleaned I'll draw up a schematic and figure layout. obviously replacing the output sockets since one is so charred
rectifier and doghouse board are fine, scrubbed with denatured alcohol. the main board is another story and not worth using in my opinion. i have a piece of vulcanized fiberboard from antique electronic supply that's the perfect size. am i correct in assuming that since there is some measure of rubber (hence the vulcanized name) that this is not susceptible to the same problems as the fender black stuff? i also have a fiberglass/epoxy board but it's shorter and fatter. i could use this but I'd rather use something that is the proper size (otherwise i suppose i could add something to an upcoming order)
chassis is covered white dusty-looking stuff that doesn't come off with denatured alcohol but my chrome polish seems to do the trick so i guess i know what I'll be doing while watching football with the wife
i hooked the output transformer up to ac and its measurements match up to another bassman 135 output transformer i picked up here awhile back so the ot is good. also tested the power transformer and that produced the expected voltages
so transformers check out, chassis is cleaned. waiting for more eyelets in the same order to finish my eyelet board, which i have laid out on masking tape that I'll tear away as i fill it (screw duct tape, i LOVE masking tape)
