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I’ve recently acquired the subject PL2000 preamp. I’m going to go through it and rebuild it as follows: Replace Electrolytics. Replace CF resistors with 1% Metal Film. Replace op-amps with modern op-amps. Install regulated +/- 15 power supply. For the Electrolytics it will be the standard...

What is the input impedance of the WhiteOak Audio control board? I have a new Dynaco PAS2 preamp that will probably need some tweaking depending on the answer.

I had a little detour before powering up the 400 with the new WOA control board. While waiting for the exchange of the variac I fashioned extra cooling fins. I found 1 x 6 aluminum channel on they bay. After cutting off one edge I was left with the perfect size to become a pair of fins. I...

In the middle of building my WOA control board my iron started going cold.:mad: I'd turn it off and on and it would work a little bit but then go cold. How could I tell if it's the base or the pencil? A new pencil is ~$45. I hate to spend $45 and find it's the base.

I have a PL400 that I'm in the process of WOPL'ing. Once I'm done I'd like to be able to turn it off and on. I found this power strip that has a remote turn on. You can use a switched outlet on a pre-amp as the control voltage. Seems like it would work well...

First time posting in the Phoenix forums due to my recent acquisition. I've been jonesing for a Phase Linear for a long time. I mainly look on CL and I don't see them too often in the Cincinnati area. One popped up on CL that seemed a good price for an operational unit. So... I’m the proud...