Looks to be the output coupling caps which are very important.
Exactly what are we looking at? Mono tube pre of some sort?
Perhaps. I know that VTL uses Mundorfs in the later version of my MB-450 amps. Audio Research gear uses WIMAs in a number of places, but uses custom teflon caps for output coupling.Its 6SN7 stereo preamp...I have some Mundorf's to replace the WIMA with...I was wondering if it was worth it...
why are they there?
I have some Mundorf's to replace the WIMA with...I was wondering if it was worth it...
Actually, I used the same as you...I used the higher Mundorfs in my amps, but I did not want to spend too much...maybe I will rethink that.Not impressed with the Mundorf, but there's a lot of good stuff happening construction-wise in that amp shot- nice job!
I believe they all do it that way for these type of caps, which are mettalized plastic conductor. The "glue is also a conductive type. I am guessing on that failed mundorf the either the glue got hard before the end cap was pressed on or the joint was dirty.I have no idea what type of Mundorf caps you have to use of course, and I'm not trying to bash Mundorf caps in any way. But, I wanted to upgrade the coupling caps in a 6AQ5 SEPP amplifier. I wanted to try Mundorf, but couldn't afford the higher range supreme oil caps. I figured I would try the standard EVO non-oil metalized polypropylenes, they are rather cheap...maybe too much...
When I was forming and fitting the leads for installation of one the Mundorfs, one of leads seemed like it broke or came unglued from inside the cap...which it did.
I never had this happen, and I've swapped more than few coupling caps in amplifiers. Maybe I was too aggressive? Really? It didn't take very much stress to do it.
The leads are glued to the electrodes. That might be okay in a speaker crossover, but I dunno about for coupling... I'm glad I didn't use them...
"Don't be Vague, Ask for Sprague."
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Thanks!
I really need to source some 2.5K OPTs of high quality that can handle a good 90-100 milliamps of current, so I can free up my universal OPTs for bread-boarding again...
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, nice!
I have several Tektronix scopes awaiting pillage. What solder did you use and how easy was it to flow?
I try to use the little spool of solder that comes inside the Tek scope whenever I've done this. I have a Tek scope graveyard in my basement...
Wow, what an amp! Did you ever do a thread on it's construction?