Check your interconnects and speaker wire first. One of my XLR ICs had a cracked solder joint resulting in volume drop. Try switching R to L and see what happens.
Harman Kardon A300
Hello everyone
I just did a full rebuild of this amp. Brought it up slowly with the variac and the B channel sounds great but the A channel is bad (really weak). I’ve fooled around with it now for a couple days and I’m starting to feel out of my skill set. Does anyone know of a good tech in the San Francisco Bay Area region? There used to be a couple places that were really good but audio technicians are a dying breed and hard to find. I’d be willing to deliver it anywhere in the state - don’t want to ship it since I’ve done a huge amount of aesthetic work on it and I’d hate for it to be damaged.
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@ccogopher Before you go to a tech you might compare the working channel against the bad one. I hope you have a schematic!! Have you been able to sort out if the weak channel is in the power amp section? Or does it occur further upstream? Do the record outputs work OK? |
Ice checked my cables and connectors and they all look ok. I’ve switched tubes and thoroughly checked solder joints. I do have a schematic and my hunch tells me that the problem is upstream of the power supply, but being a beginner, I’m starting to get into an area that requires more technical knowledge than I possess. I’m going to start going through it more methodically today but I’m doubtful that I’ll get it sorted out which is why I’m looking for a tech because I need a plan to fall back on if my efforts to solve this problem fail. |
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