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In Reply to: RE: Dynaco QSA-300 posted by dpsutphin on July 06, 2016 at 13:06:54
I built one in the 70's. I seem to remember there was a build option to permanently bridge it making it 150 X 2 instead of 75 X 4. I'm sure the schematics and probably the kit instructions are online somewhere. Does it look factory wired? I would also check the finals right away. Good luck.ET
HiFi engine has the kit instruction manual/schematic and it talks of the ways it can be internally wired in the kit instructions. Its a 28 page thing. I would read it and check how yours is wired. I seem to remember someone wiring one side together for running a sub and the other in stereo for standmounts therefore making a three channel amp. Read the we tion toward the end called combining channels. This explains how to make it a two or four channel amp and how to optimize it for 2-4 ohm loads or 8-16 ohm loads. It involves jumpers on board pc-43.
Edits: 07/06/16 07/06/16 07/06/16Follow Ups:
Just wanted you to know that clicking on the link in the post to the schematic / manual takes you to one of those fake virus alerts. Looks like someone hijacked your response.
I have examined the board, and it is wired as I thought. A & B are on one board and C & D on the other. I'll go to the manual and schematic from outside the link so I can figure out for sure how it is wired.
Thanks for your help.
I didnt post a link. I just put the name of the website that had the pdf which I viewed without an issue.
ET
I will check that out. Maybe I only have one bad board. Just depends on how it was wired when it was put together. Thanks.
The amp has two boards. You'll see when you read through. There are pictures too. What is unknown is how it is wired since that is up to the builder or could have been modified by any owner.
ET
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