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Old 2nd March 2009, 06:45 PM   #1
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Default Schematic For Plate Amplifier Needed

Anyone here have a schematic for the Parts Express 300-794 or 300-796?

I recently picked one up (looks similar similar to Apex Jr's MK VX-1250) locally, and really need a schematic to test and work on the thing. All I found was a chart for resistors to change boost.

There are two large caps (labelled "Jun Fu 150uf/100v N.P.") on the circuit board, presumably signal path/ DC blocking caps-?

Any recommendations for higher quality replacements?

-Joe
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Old 5th March 2009, 04:38 PM   #2
clm811 is offline clm811  United States
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I wouldn't mind getting a schematic for this, as well.

I now have a schematic for the Keiga 5230, but it's only similar, and there are lots of differences(e.g. variable phase on the P.E unit).

-Chas
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Old 7th March 2009, 10:17 AM   #3
djk is offline djk
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The caps don't pass any signal unless you are hooking up your main speakers to the sub amp as well.

http://www.apexjr.com/images/sr3.jpg

If you are hooking up your main speakers this way, I suggest you parallel the 150F electrolytics with about 4.7F~10F of good polypropylene.
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