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This is great news! I just started assembling WOA Model 1 S/N 3. Eric, do you have S/N 4? I have not kept up with the sales figure.

I have a PL400 with S/N 1043-225A. I have heard several variations on the A designation. One was that A showed the amplifier was ordered by an employee. Another legend was that the A fixed a duplicate serial number. Lastly, I heard the A meant that the amplifier had to go through rework, but...

An easy solution to this issue is a new White Oak Audio Dual Mono Control Board. The added benefits are state of the art technology and better architecture than the original antique Phase Linear control board, superior reliability from the best parts available today, and a substantial...

I would put my ungrounded scope on the outputs to see the distortion, then work backwards along the signal path until I found no distortion. If this issue is present on both channels, it is likely a power problem. Ensure the rail fuses are all good by verifying the voltage on the load side of...

That Dual 500 is in fine shape. New Main Capacitors are a must. I have a new, proper (35,000uF 120VDC) pair for the Dual 500 if you want them. These: https://www.tedss.com/2020064119?srsltid=AfmBOoptm86mdeTa7Op6EE-zkuEOB2XzM8wfCHON5G4k5jFwZt7mkII7 Send me a PM if you are interested...

He is learning, just as we did... Soon he will be teaching the newcomers.

I buy NPN and PNP Output Transistors from WOA in ONSEMI factory trays of 100 at a time (all 100 had the same date code). I used to test each device for Gain and Leakage with my Sencore TF-151A Transistor Tester. When I got consistent variations of less than 1%, I stopped testing.

Your Panasonic capacitors would be a perfect fit there.

I will send my Sennheiser HD 600 to you if/when it ever croaks. I would be interested in a new cable, I have stepped on mine too many times and it would be prudent to have a spare.

The new Oppo won't play mp3?

Gene, If you need a new PL400 DCP "U1" IC SIP Chip P/N C1237HA, let me know. They can be hard to find, but I have 8 of them.

George, quite right. I have replaced the original broken sockets for customers that want to keep their amplifiers "original." Gently squeezing the two socket pin receptacles can bring an original socket back to life. Of course using Sil-Pads rather than mica and silicone is also a must for any...

The early Phase Linear amplifiers used RCA 410 Driver Transistors. Later units saw RCA 66546 Driver Transistors, which are the exact same device with a newer RCA part number. These are the only recommended drivers for a Quasi-complementary (in which all NPN power transistors are the same -...

Joe is a busy guy. He is the designer/engineer of the circuit boards and kits and he builds and sends the orders for the boards and component kits himself. Try to limit your requests for merchandise that can be found on his eStore website. All your technical answers and most parts can be found...

Post a list of what you need, members here likely have them. You may not find exact replacements are available commercially. Your PL700 was assembled in November, 1972 and was the 25th unit assembled that month. The production of the PL700 began in February, 1971.

Gene, You have a Left Channel issue, no? Bad Left Channel Bias voltage could point to the Bias Transistor supply circuitry (2N5088 are the good ones). Can you change the Left Channel Bias Voltage by operating R2L Bias Potentiometer? Next I would ring out D1L-D4L, part of the Bias Feedback...

Failing MJ21195 and MJ21196 transistors is sorta rare. The specs on these devices are pretty impressive. It will be interesting to see what you discover. I am with Lee, if your Bias Transistor in that channel is original it could be a cause as well as a casualty. I seem to remember if the Bias...

This is a typical well-used Phase Linear Control Board. Those large 1 Watt Resisters and Zener Diodes were used by Phase Linear to reduce the B+ Rail Voltage (+80VDC for the PL400 and +100VDC for the PL700) down to +20VDC for circuit board control voltages. The result was heat and a lot of it...

The first CD imported to the United States was Born In The U.S.A. by Bruce Springsteen, released in September 1984.

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