Schematic For Plate Amplifier Needed

jtsaudio · 2nd March 2009, 05:45 PM

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

clm811 · 5th March 2009, 03:38 PM

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

djk · 7th March 2009, 09:17 AM

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 150µF electrolytics with about 4.7µF~10µF of good polypropylene.

2nd March 2009, 05:45 PM	#1
jtsaudio diyAudio Member Join Date: Dec 2007	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

7th March 2009, 09:17 AM	#3
djk diyAudio Member Join Date: Feb 2001 Location: USA	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 150µF electrolytics with about 4.7µF~10µF of good polypropylene. __________________ Candidates for the Darwin Award should not read this author.

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5th March 2009, 03:38 PM	#2
clm811 diyAudio Member Join Date: May 2002 Location: Northern California	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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