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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.

PM sent.

If your four-fin unit came with the two Transistor Covers, I would be interested in them for my four-fin PL400. Mark

Thoughts on the Staco?

They are 190 miles south of me. Sorry, Mark

The four fin PL400 is the earlier model. Most have the capacitors attached to the side of the chassis with clamps, while the later amps use an aluminum cradle above the transformer. There were other improvements in the later models such as the lighting arrangement for the meters. Most of the...

Or, originate...

I believe in this case the manual is correct. My (2) PL2000 preamplifiers came with 10uF caps at C42 and C43. Are you sure C42 and C43 are not 47uF? This is what I did to my PL2000 Series I: Upgrade (C42, C43) from 10uF to 100uF/35V, Mouser P/N 647-UFW1H101MDD1TA. Upgrade C21, C22 from .22uF to...

Just wait a few years for your hearing to become "adjusted" and then all of your set ups and room modifications will sound just about the same.

Be careful when using current feedback op-amps like the LM 4562 and be extremely careful if you have caps across feedback resistors when using CFB op-amps. The LM4562 was introduced by National Semiconductor in 2007, this was 17 years ago and it was a competitor to the 1997 Texas Instruments...