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There was a "meter service bulletin" issued on this very subject. For a Phase Linear 400 series 1 amp, 0 VU corresponded to 50 watts or -6dB. NOTE: This was different for the 700B. I also started a thread on the very subject of analog style VU meter calibration a while ago. Ed

Mark, Ken Cox was the purchasing agent at Phase Linear. In the earlier days at Phase Linear Ken ran the stores. With perhaps the exception of some early 400 series 1 amplifiers that used Midland meters (I will have to double-check on this), the bezels used on the Phase Linear 400 and 700B...

Joe, It all makes sense. I am not sure how effective the aluminum "hum shield" was as a ground bus. There was also a small jumper wife between the ground terminals. I will take some measurements once my wife gets off my back on selling the other mechanical/physical measurement and test...

Joe, I mentioned to Lee a while back that at some point I would test an original 700 with and without the aluminum "hum shield". (I haven't had the time to do that yet.) Dean didn't seem to think the hum shield had any effect. However he didn't back it up with any data. Bob Carver must have...

Cancer

It saddens me to report that Kingman passed away yesterday. He entered hospice care a few days ago.

I'm the one who bought the purple Heil Sound 700. Even rarer than Clair Brothers or Audio Analysts which came later.

These belong to Darrel Fisher.

I think you mean Dean Nissen? If so, Dean was the last factory Phase Linear service manager at their Lynnwood Washington location. Dean and I shared a Phase Linear web site for many years on AOL until October 31, 2008. A link to an archived copy of it should appear below this message. NOTE...

If you have the original output transistors or power supply capacitors they will have 4 digit date codes on them that will give you a relative idea when the amplifier was built. Usually a few months after the transistor or capacitor indicates.

Somebody better jump on this deal real fast! Ed

The first boards made for the 700 were a 4 channel pc board bridge to (2) channel output. Then the boards we call the "Kelly DeYong" pc boards (used in 700's primarily used by Kelly DeYong Sound in Canada). I previously posted pictures of these very rare amps on this forum. The PL0171 was used...

The Absolute Sound Issue 290 January 2019 TAS LEGACY: Phase Linear 700 Power Amplifier http://www.theaudioanalyst.com/images/articles/TAS-290-GW-Legacy-Phase_Linear_700.pdf Full 600 word unpublished version here: http://www.theaudioanalyst.com/images/articles/TAS-290-GW- Legacy-Phase-Linear...

I just completed loading (27) missing magazines. Starting with post #206 in this thread. NOTE: The items noted below in bold and underlined are yet to be obtained and loaded. If any of you out there have a copy, please let me know. All others have been loaded. Audio magazine June 1971...

Audio magazine February 1975 (Phase Linear (700B) PL14 pc board appears on the cover) https://www.americanradiohistory.com/Archive-Audio/70s/Audio-1975-02.pdf

BAS Speaker Vol. 2 No. 4 January 1974 (Bob Carver visits BAS and demonstrates the Phase Linear 4000 Preamplifier) pgs 2-4

BAS Speaker Vol. 2 No. 10 July 1974 (Editorial comments on the Phase Linear 4000, BAS Test Report: The Phase Linear 4000 Preamplifier)

BAS Speaker Vol. 3 Number 2 November 1974 "A Comparison of the Dynaco 400, Marantz 500 and the Phase Linear 700" pgs 3, 4

BAS Speaker Vol. 3 Number 7 April 1975 "TIM Revisited: letter from Bob Carver" pg 8 https://www.bostonaudiosociety.org/pdf/bass/BASS-03-07-7504.pdf

BAS Speaker Vol. 4 Number 1 October 1975 "What's Up at Phase Linear?" pg 8, 9 https://www.bostonaudiosociety.org/pdf/bass/BASS-04-01-7510.pdf