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As for DC protection, I sell an output relay board that drops in the 400 without any drilling. Cost is $114. Everybody at this site refers to it as DCP. Rather than comment further I'm sure somebody else will do that for me. Installation is not that difficult, but it does require a soldering iron.

San Diego, CA.

Please call me buddy, 520-325-9642

I want to adjust the timing of the DCP. Currently the relay energizes in about 3 seconds. My PL4000 preamp does not output a signal for about 15 seconds, and then when it does, goes through a short 1-2 second transient where it outputs a 0.7 vdc signal. This is enough to trigger the DCP (and I'm glad it does!). So I'd like to delay the DCP for say 20 seconds to allow the PL4000 to do its transient thing.

I have a drop in relay board that disconnects the output of the amp if it fails like the one that took out your Bose 901's. Here is a link, http://www.wattsabundant.com/

Ed,

Thanks for your post on 200. It drives me crazy to see people try to troubleshoot something with no idea what they are doing. Compound that with good intentions from people who troubleshoot by changing out all of the transistors. Then the person doing the repair goes about doing whatever they intended to do regardless of what advice has been given.

Do you know why the 200 had non symmetrical clipping?

Hi Glen, Thanks again for calling. My email is hennioriginals@gmail.com
Regards, Peter

Peter, see your messages, thanks.

I've got the 400 relay board. $99 inclusding priority mail. Here's my web page. http://home.earthlink.net/~dimlay/id24.html

I'm glad to hear the relay board did it's job. I rarely get any feedback about it. The relay is considered sacrificial when it protrects the speakers. Inspect it for signs of welded contacts. If it needs replaced let me know. Consider putting two 4" muffin fans wired in series, one on each channel if you're going to run it hard. When wired in series, the fans run at half speed and are quiet.

https://forum.polkaudio.com/discussion/189274/for-sale-mw6509-sda-driver
Might be a bit high but if you are still looking......

Hi BlueCrab; thanks again for your input, it is clear to me that you know your stuff! As your entry #275 shows, I still measure 60 VAC. The White Oak mods call for the ctr tap to be connected to the chassis at one point only; the screw formerly holding the terminal strip between the left channel heat sinks. I have just measured the assembled amp again; 60 VAC is on the chassis when the line cord ground N/C.

Still running around, been a busy year, nice to have time to visit areas of interest. Drop me a message if you like.

With reference to the dual 500, did you install a soft start? I ask because I've done a fair amount of research on inrush current on 700's and haven't seen a need for it there. I tend to think the impedance of the transformer limits the current to safe values. Note that the stock rectifier can withstand more than 150 amps.

Hello I just bought a dead TEAC A-3300 SX and this repair appears to have already been made once before. I will have to troubleshoot the problem further. But this is valuable info Thanks. Any thoughts about some common shorts to look for this deck is like new, I want to save it. Someone, probably a less experience tech has been through it the rectifier board had a plastic cover missing on a MY2-01 or MY3.

I re-racked the living room stereo after finally getting all the outside work done and returning to the glorious AC, cleaned up 7 VCRs for repairs and just jammed last night. 1998 Pioneer VSX-D307 is the base.

Hi Mark;
You commented on my Clair Bros PL 700 project, a few weeks ago (thank you). I see that you are also rebuilding a series II. Did you get the White Oak back planes or the control board only? How is your project coming?
Regards, Peter

Do you still have that PS Audio 200 ?

Ballgame's on! I don't care if the team sorta sucks...it's a BALLGAME!

Finally looked at the 5050 and discovered, yes, the speaker selector was not set right. How I don't know but it sits behind this computer...I missed listening to it.