Hi there,
Got a good deal on ebay for an old JC-77. Its got a few problems...mostly, it would seem, from sitting around accumulating cobwebs and getting pretty dusty.
There is also a substantial amount of hiss, even with the volume set all the way on zero. I've read that the Jazz Chorus line has a lot of hiss but this seems excessive. A friend brought his JC-90 to my house a couple of months ago and it was nowhere near this noisy.
Is it likely that the hiss could just be caused by dirty pots? And in that case would it make sense to just replace them? Or is there something I can spray in there to clean the contacts but also get any dirt out? It seems like they will have to be disconnected from the circuit board because the opening is on the side facing the board.
Is there anything else that could be causing hiss?
Is there a place to order replacement parts for these amps? The pots look to have a smaller than 3/8" bushing. Also the Chorus switch seems like it should be replaced since it is cutting out when set on "manual" mode
Thanks for your help!
Got a good deal on ebay for an old JC-77. Its got a few problems...mostly, it would seem, from sitting around accumulating cobwebs and getting pretty dusty.
There is also a substantial amount of hiss, even with the volume set all the way on zero. I've read that the Jazz Chorus line has a lot of hiss but this seems excessive. A friend brought his JC-90 to my house a couple of months ago and it was nowhere near this noisy.
Is it likely that the hiss could just be caused by dirty pots? And in that case would it make sense to just replace them? Or is there something I can spray in there to clean the contacts but also get any dirt out? It seems like they will have to be disconnected from the circuit board because the opening is on the side facing the board.
Is there anything else that could be causing hiss?
Is there a place to order replacement parts for these amps? The pots look to have a smaller than 3/8" bushing. Also the Chorus switch seems like it should be replaced since it is cutting out when set on "manual" mode
Thanks for your help!
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