Derek92994's 700 Ser II White Oak conversion

derek92994

derek92994

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What are the specs for the emitter resistors that I need to get for spares? I know they are 0.33 ohms, what voltage, watt and tolerance is needed?
 
derek92994

derek92994

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J!m said:
That step-down may be picking up noise too Does it have a 3-prong inlet cord?
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Yes it does, I have a 2nd one which I can try, they are both cheap chinese made. I have had no problems, the noise only started when I use the Pioneer 9500s as a spare, and since that amp is over 30 years old with original caps, I wouldn't be surprised if it had a slight issue. But it does the job and keeps quiet with that earth wire in place. Not a permanent solution but not a permanent amp either.

Another thing I should note, is that when the PL amp failed (e.g. blew rail fuse and output), one time it was running off battery and the other time it was running off the mains, so I would think that my supply is ok. I am currently idling the PL amp with speakers, but this time it has its own dedicated 15 amp circuit separate from everything else. No 'pop' yet but it could take days or weeks to fault again.
 
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George S.

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Have to wonder if power surge isn't taking out the amp. Maybe use some sort of surge suppressor or conditioner made for computer use. With your grid and solar system powering the house, maybe there's some way to monitor your voltage and frequency over several weeks on some sort of software. There are programs that can monitor motherboard voltages, maybe some way to monitor line voltages. Perhaps your local power company has a instrument that will do this.
 
derek92994

derek92994

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George S. said:
Have to wonder if power surge isn't taking out the amp. Maybe use some sort of surge suppressor or conditioner made for computer use. With your grid and solar system powering the house, maybe there's some way to monitor your voltage and frequency over several weeks on some sort of software. There are programs that can monitor motherboard voltages, maybe some way to monitor line voltages. Perhaps your local power company has a instrument that will do this.
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I am using a furman power conditioner. The amp has failed on both battery and mains power. The furman would not let anything get through, it tripped once a few years back, the extreme voltage led lit up and saved everything connected. I also have surge protection built into the house switchboard.
 
derek92994

derek92994

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Update, I went back to the Pioneer Amp and P 3600 Pre combo. I powered down the WOPL and everything else to do this. Had to reconnect the cassette deck which was connected directly to the PL Amp. When I powered up the WOPL again with nothing connected, volume pots down, it sat there for about 10 seconds before the relays clicked. This is unusual, and it was also running off mains. No pops or other artifacts were heard when I ran it with music for about 4 hours today. Am idling it on the spares with no input and volume pots up like before. That's all the info I have at this stage.
 
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George S.

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derek92994 said:
I sure do hope so just the one! The delayed relay click that one time was a clue, but not enough info to pinpoint the fault.
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Try reseating the wiring that goes to the Phoenix Connecter on the DCP. Make sure it's tinned and the correct length, no wire insulation in the clamp or too much tinned wire showing.
Probably something simple. Other than the two speaker hot wires and two speaker grounds, there are two AC wires directly off the rectifier and a DC ground from the buss bar.
You've got the skills to troubleshoot it. There's ample documentation on Don's "Watts Abundant" site. Exterminate those Gremlins!
 
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