Hi,
I have a F-800G for a customer that has been restoring it but it never had the fuzz and phase section working. I went through the preamp and found several of the SPS953 transistors bad as well as several polar caps. They were replaced and I still didn't get a response. Looking over the power section two of the pre drivers were reading bad and I switched them out as well. No I have no sound! Little bit of a pickle. The amp isn't worth the stress, but it means something to the customer and I'd like to make good on it for him. Any ideas? The amp powers up with lights n all. There's no sound now so I'm afraid I've shot a couple of the outputs on the back of the amp. I'm worried about testing while it's on because the damn thing is huge and the humongous filter caps are in a terrible position.
Schematic below. Thanks in advance.
I have a F-800G for a customer that has been restoring it but it never had the fuzz and phase section working. I went through the preamp and found several of the SPS953 transistors bad as well as several polar caps. They were replaced and I still didn't get a response. Looking over the power section two of the pre drivers were reading bad and I switched them out as well. No I have no sound! Little bit of a pickle. The amp isn't worth the stress, but it means something to the customer and I'd like to make good on it for him. Any ideas? The amp powers up with lights n all. There's no sound now so I'm afraid I've shot a couple of the outputs on the back of the amp. I'm worried about testing while it's on because the damn thing is huge and the humongous filter caps are in a terrible position.
Schematic below. Thanks in advance.
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