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So I was up at my elderly neighbours house this arvo, 

and he said think you can this ol girl fired up for me ? 
Guess I got something to do this long weekend.

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Just be careful! I have one which smoked. Didn't kill my speakers though. Had it restored with boards from the US and extra fuse protection. It's a great amp. I have it partnered with the 3300 series 2 preamp.

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Hi, yes I first gave it an Insulation Test, and then replaced the supply 

fuse which was only 32 volt ? I also replaced the supply cord too.

I connected a DAP to it and sounds great , lots of power and no 

distortion. The only issue was when you power it off there’s a ,

‘ pop ‘ noise from the speakers.Apparently this is normal as stated in the manual. Other online user have stated the same thing. 
Some suggest a relay or replace the capacitors. 
Cheers Paul.

 

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Check out White Oak Audio in the US. They specialise in upgrades for vintage Phase Linear. I got my new main board and matched caps from them. Cost of postage is a pain but their components are excellent.

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Check out the pheonix site for all things PL

https://forums.phxaudiotape.com/

 

The unit probably needs main caps replaced, these were undersized from original. The circuit boards are not great, don't tolerate re-work well. If you can get it working normal you won't need another power amp.

 

Strongly advise to fit an after market spkr protection kit, basic units can be had off the bay for about $20-, maybe another $10- for dedicated paower transformer.

 

The PL400 Series 1 has a power up "race condition" that may mean rails voltage (+/-80Vdc?) being dumped on the spkr line, pheonix has a detailed description of the sequence. They suggest a work around/fix of connecting back to back diodes across C8. Not sure if similiar problem exists with Series II.

 

I've got 2 in the shed, one will get the White Oak treatment when I muster up the courage...

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