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Here is a link to Darrel F's comments about Phase Linear amps. NOTE: Darrel is also owner of the purple Phase Linear 700. Scroll about one-half way down on the page and look for "Purple Phase Linear 700" http://www.audioreview.com/product/amplification/amplifiers/phase-linear/400.html?p=2#reviews

Somewhere in my collection of stuff is a "Interphase Acoustics" 4 way active (requiring external power) distribution box that was used in the Heart P.A. system many years ago. It was designed to go after a 4-way active crossover and before the amplifiers. In turn the distribution box provided...

Correct. If my memory serves me correct.......... With passive crossovers there can be an "insertion loss" of anywhere from 1 to 3 db. In order to get 3dB louder you have to double the output power of an amplifier. (i.e. 100 watts to 200 watts only gains you 3dB). Likewise to go from 1000...

This appeared as an ad in Audio magazine in the May 1981 issue on page 87 and High Fidelity magazine in April 1981 on page 85. In 1976, Phase Linear placed some ads when they hit "over 8-1/2 million watts".

The PL-33 pc board in the D-500 is also made by "SEIKO AAF".

Joe, It appears that you forgot that I mentioned the RCA jacks issue to you on the phone and how to test and reform them. Before you fire the amp up again, I would suggest performing as many resistance measurements as you can. This service manual states: "Most transistors and diodes in the...

Joe, It was a pleasure talking to you today. Good luck with your repair. Ed

Joe, I see where I made my mistake. Thanks! Ed

Some food-for-thought. I could be wrong, but the variables might well include the following: Single channel or both channels driven. Amplifier loaded or unloaded. Constant voltage source (i.e servo/motor driven Variac) or a source that sags. Temperature Input (signal) source (flatness...

In terms of dB, there are a variety of db units of measurement. In most cases, I'm using dBV for most of my measurements and performing the necessary calculations, in order to obtain certain figures with respect to full output (0dB), -3dB, -6dB, -10dB or referenced to 1 watt. However, in your...

Jerry, I sent you a PM. Ed

A.P. Van Meter designed the Phase Linear 5000 tuner. A.P. had previously worked at McIntosh just after he graduated from the University of Oklahoma. A.P. was on the ground floor of FM stereo in late '61, early '62. He has a bunch of interesting stories about those early days. I had a McIntosh...

Glen, As with most analog tuners they tend to drift with age. Over the years, I had the opportunity to watch Dean perform his magic on many a 5000 and 5100. I haven't seen a 5000 yet that has met factory specs. Unless of course someone else has done a recent alignment (say within the last 10...

I just spent the last couple of hours with a magnifying glass reading the schematics and layout views in the Phase Linear 4000 series 2 service manual. I have put together a list of capacitors used in the 4000 series 2. NOTE: On page 46 of the service manual parts list, Phase Linear did not...

It appears that the Phase Linear 5100 tuner was not only sold as a Pioneer TX-D100 but also as a Pioneer F-D7. There is some repair/adjustment information on the following website: https://translate.google.com/translate?hl=en&sl=ja&u=http://nice.kaze.com/av/f-d7.html&prev=search Ed

It appears that the Phase Linear 5100 tuner was not only sold as a Pioneer TX-D100 but also as a Pioneer F-D7. There is some repair/adjustment information on the following website: https://translate.google.com/translate?hl=en&sl=ja&u=http://nice.kaze.com/av/f-d7.html&prev=search Ed

It appears things have changed since the "upgrade" to the forum. The link is now at: https://forums.phxaudiotape.com/threads/phase-linear-400-series-amplifier-specs-sales-brochures-owners-service-manuals.8493/

A photocopy is available on ebay for $14.00 plus shipping or an original for $20.00 (free shipping & free returns).

The 400 series 1 amps went into production in December 1971. The serial number on the sticker is date coded, i.e. 342-153, the first number (3) would indicate the month of March, the second number (4) would indicate a model 400, the third number (2) would indicate the year 1972, -153 would...