unclej Posted December 30, 2004 Report Posted December 30, 2004 i need to replace this can capacitor on the ampeg i've been working on. the one in it is a 40/40/40mfd 500vdc. vibroworld makes one to fit ampegs that is a 40/40/40 x 475vdc. will it work or burn out quickly? in lieu of that can i wire in three single 40mfd x 500v electrolytics by taking all of the neg. leads to ground and attaching the hot wires in the same configuration that came off of the can? Quote
JohnnyG Posted December 30, 2004 Report Posted December 30, 2004 it should almost certainlly be fine. i doubt that the B+ voltage will be as high as that and it should be high enough to be easilly safe. you may wanna just check the B+ voltage incase but its just within a 5% tolerance so it should be fine Quote
unclej Posted December 30, 2004 Author Report Posted December 30, 2004 thanks, i'll do just that. this is as close a match as i've been able to find anywhere and i'd like to get this thing finished so i can quit boring you guys with it. Quote
ansil Posted December 31, 2004 Report Posted December 31, 2004 the b+ on most amplifiers at idle swings quite higher than the capacitor ratings. in instances the plexi at the shop i had up till last week was aproximately 525v when it first fired up and if it idled for some time. its caps were no more than 400v. personally i like to have a couple hundred volts to swing in case of craziness. but i also but like 700mfd of filtering in the amp because i can be ****.. Quote
JohnnyG Posted December 31, 2004 Report Posted December 31, 2004 ah fair enough, seems like i was wrong (suprise ) i knew that an amp would draw alot of current when i started up but i never realised that the B+ voltage went up high btw ansil man, hows the neck? Quote
lovekraft Posted December 31, 2004 Report Posted December 31, 2004 (edited) We are talking about the Gemini II here, right? Don't the caps in that can filter the preamp power supply rail? Unless I'm misreading the schematic, they're running at a lot lower voltages than the power tube plates and screen grid. If you want to check it out, here's Joe Piazza's voltgae chart for that amp: Ampeg G-15 Edited December 31, 2004 by lovekraft Quote
ansil Posted January 4, 2005 Report Posted January 4, 2005 ah fair enough, seems like i was wrong (suprise ) i knew that an amp would draw alot of current when i started up but i never realised that the B+ voltage went up high btw ansil man, hows the neck? thanks man.. uh not so hot better pain medication i guess is the only reason i am on Quote
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