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In Reply to: Re: adcom 545II v. citation 19 v. sumo polaris posted by JoeKool on March 20, 2007 at 13:20:04:
Hi
I am not trying to hijack this thread, but I am looking for a diagram of how the big capacitors in the Polaris are hooked up. I have one I am trying to save. I got it missing the capacitors. I have new ones, but can't find a schematic of the power supply or a diagram of where the leads go on the top of the caps. There are 4 leads to the screw-on connections. Plus+ is on the right on each.Can you or anyone give me an idea what leads go where. There are red and blue leads, and grounds. Some I can trace from the bridge rectifier, with others it isn't obvious.
(Yes, the Sumo is a cool-looking amp.)Thanks, I'm desperate.
Pete
Vintage Voltage Expo
Denver - March 25
Follow Ups:
I think there is a pic of the internals in the review of it: Audio Nov. 1987.
Rely on the bridge rectifiers to give you your cues, but, generically, the negative terminal of the capacitor on the left will be connected to the bare wire grounding bar (chassis ground) which will also be connected to the positive terminal on the capacitor on the right. The most positive leads (red) will be connected to the positive terminal of the capacitor on the left. The most negative leads (blue) will be connected to the negative terminal.Again, this is just 'best guess', but I haven't heard of any radical power supply innovation which was used to describe the Sumo Polaris, so it seems fair to connect in anticipation of a straight push/pull, V+/V- solid state amp. You could also check the polarity of the PC mounted electrolytics to confirm the connections. A schematic would help and, I am also wondering why the amp showed up to you without filter caps. If you don't have a Variac I would stand well clear when repowering the amp .
Thank you for your suggestions.
What is odd is that the red leads all naturally fall to the left and the blue leads to the right.
There is a right and wrong about these connections and I will not turn anything on til it's right.The Polaris was cannibalized for the caps, which apparently were were used in a Mac amp of greater value. I got this one cheap, knowing it was a project.
I have asked for schematics on a few forums, but can only find driver board schematics, not PS.
Pete
The driver board schematics will give you the proper orientation of the V+ and the V-. With those you can find out which wires, whether blue or red, are correct for the voltage sources. If the connections are standard, all the reds will be on the most positive terminal and all the blues will be connected to the most negative. Grounds will connect, through black wires, at the chassis ground buss.
I have been away from the project for a while and I will try to figure it out.Pete
Just took a look at my Polaris III... it doesn't look anything like that, its completely different, plus it has 4 10,000uf caps, 2 standing+ 2 horizontal on the pc board. Sorry, can't help you there. The manual doesn't have a schematic in it either.
The Polaris III must be a very different animal, from mine.Thanks,
Pete
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