Recent content by Mark Stanley

I have been thinking about the comments and advice given by each of you and have decided to go with the White Oak Board. Seems this might be best considering the time/money factor together with sound quality and reliability issues. When I get the board assembled and installed I’ll be back here...

I thought it might be an early one. I need to get it on a dim bulb tester and see where it takes me. I’ll post back in a day or so. Have to go to Louisville Ky tomorrow. Thanks for all the help.

Also there are absolutely no markings on the board to identify it.

When I receive it a couple of months ago I looked it over and it was my opinion that it was all original. If it wasn’t it was not obvious.

Here are pictures of the board and the back of the transformer.

Thanks. I’m going to grab that schematic and go from there.

I still fell very uncomfortable not having a schematic for this board. I have read the service manual as advised and examined the schematics listed with the service manual and none of the schematics show my exact board. I can’t believe this board has no published schematic but maybe it doesn’t.

I’ll give it a try and get back with a post

Thank you for all the help. I have looked at the white oaks upgrades on line. Looks like something to consider. Would still like to get the original equipment up and running if possible. Whenever I start bringing the voltage up slowly it starts to draw too many amps. When it starts to draw...

Great! Thanks for the advice. I’ll give it a try and message back.

Thanks for the warm welcome. I have the service manual off hifiengine but it doesn’t show my board. The board it shows has 4 trim pots but mine has 6. Also a comparison of the resistors indicates some differences. I suspect 2 of the trim pots are for the bias and 2 for the offset but what...

Hi. I’m brand new to this forum. Not sure if I am in the right place but I need some help with a PL 400. Picked it up a few months ago in a none working condition. I think it is a very very early model. It has 6 variable resistors on the board and I can’t find a service manual or schematic...