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Heathkit AA-121 feedback cap question
Hi,
I'm restoring my Heathkit AA-121, and notice that the cathode cap/resistor network coming off the first 6AN8 contains a 50uf 15v electrolytic coupled with a 680 ohm resistor, and then connects to the feedback loop going to the OT secondary via another resistor/cap network. I hate the idea of any of the signal path going through an electrolytic but am not sure if it's worth replacing with a large (and expensive) film or poly type. I've seen some Solen's and Dayton 50uf poly's commonly used in speaker crossovers that might work/fit since there is a lot of room in the amp chassis. My question is: Is it worth doing? The 50uf poly's are around $13 each. The money's not a big issue, but I don't want to do it if it really doesn't matter. I really do like this amp. Kevin Killebrew Austin, Texas |
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