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  1. oldphaser

    Testing WOPLS "automated" by Jer...

    HP 8903 software: http://www.pmillett.com/hp_8903_software.htm
  2. oldphaser

    Sutt's "Fugly One" WOPL Transformation

    Mark, I did some testing on (2) 700 series 2 amplifiers that Don G. owns. Both have a fully complementary output. One was a WOPL with a rev E board. The other was a Phase Linear (Clair Brothers) 700 series 2 amp. The Clair Brothers had a PL-36 pc board with a factory low distortion mod (which...
  3. oldphaser

    I'm Buying a "Mule" PL400

    So what is it that would create a "big soundstage"? Better channel separation (a.k.a crosstalk), etc?
  4. oldphaser

    Phase Linear 400 manual

    The first one in the ebay ad is an Edmonds version. The second one I am not sure of as I don't have a copy of this one. The 3rd one (OM400-3) was when they were in Lynnwood and is actually a gray cover. Ed
  5. oldphaser

    Sutt's "Fugly One" WOPL Transformation

    I posted the following a little while ago: A Phase Linear 700 series II amplifier; single channel driven at 1kHz into 8 ohms at 1% THD should be around 510-515 watts. Both channels driven at 1kHz into 8 ohms at 1% THD should be around 440 watts. Both channels driven at 1kHz into a 4 ohm load at...
  6. oldphaser

    Phase Linear 400 manual

    Yes there are differences between the Edmonds, WA and Lynnwood, WA versions of the Phase Linear 400 series 1 owner's manual. I have second generation photocopy of the Edmonds, WA manual. I am also missing pages 6 and 7 and am unsure whether there were any pages beyond page 8. Ed
  7. oldphaser

    Phase Linear 400 manual

    I am not the one who would give permission or not on posting any Phase Linear documents. Phase Linear is now owned by Vox Electronics (formerly Audiovox). Ed
  8. oldphaser

    Phase Linear (Magazine Reviews, Articles, Etc.)

    Phase Linear 400 Review (Hi-Fi World Spring 1974) I previously posted this with a second or third generation copy which was missing the cover and index pages. Here is a 1st generation copy with cover page, index page, pages 40-42, and 54.
  9. oldphaser

    Phase Linear (Magazine Reviews, Articles, Etc.)

    Phase Linear 4000 Review (StereOpus Volume 1 No. 3 1975) (see cover page, index pages and pages 17-19 below.)
  10. oldphaser

    Phase Linear (Magazine Reviews, Articles, Etc.)

    Phase Linear 400 vs Crown DC-300 (Hi-Fi Newsletter Volume 3 Number 4 May-June 1973) (see cover page and pages 22-26 below)
  11. oldphaser

    Phase Linear (Magazine Reviews, Articles, Etc.)

    Phase Linear 400 vs. Dynaco 400 Amplifier (Hi-Fi World Newsletter Volume 1 Number 4 Winter 1974) (see cover page and pages 21, 22 and 24 below)
  12. oldphaser

    Phase Linear 700B Rack Handle History

    That is correct. The handles were made in England for Bud Industries. I've made a few attempts and internet searches over the years to try and find out who made them but with no luck. I'll bet somewhere in England there are perhaps some homes with some of these exact same "drawer pulls" on...
  13. oldphaser

    Any interest in 700B Handle group buy (minimum $150 buy in for 2 pair)

    Lee, I started a new thread on the Phase Linear 700B rack handle history: https://forums.phxaudiotape.com/threads/phase-linear-700b-rack-handle-history.8726/ Ed
  14. oldphaser

    Phase Linear 700B Rack Handle History

    Lee has inspired me to write some musings on the Phase Linear 700B Rack Handle history: The Phase Linear 700B rack handles were originally obtained from Bud Industries as part number H-9152 and were listed in Phase Linear master parts list as part number 121-0026-0. It appears that they were...
  15. oldphaser

    Resistor Noise

    When you get some time, reading some of the documents above should be helpful as it will show you how much noise voltage and noise current there is for various types of resistors. I have not yet had a chance to populate the same model pc boards, one with one type (i.e. carbon composition) and...
  16. oldphaser

    Mark goes at it again... just bought a PL700/II!

    When you get a chance, in order to gain a better understanding of the purpose of an emitter resistor, perform a search on the internet for "emitter degeneration". Ed
  17. oldphaser

    Will PL 400 mod also benefit a PL 700 (both Series I)?

    Unfortunately, Dean and I didn't keep any data on the carbon composition resistors that were going up in value (greater than +10% of nominal). If my memory serves me correct, it was the lower value resistors under 1K ohm we had issues with. In some cases the values doubled. It's just better to...
  18. oldphaser

    Different Kinds Of Meters Give Different Readings According To The Waveform

    Different Kinds Of Meters Give Different Readings According To The Waveform This was obtained from Norman Crowhurst's book Basic Audio Volume 2
  19. oldphaser

    Testing WOPLS "automated" by Jer...

    The attached document was obtained from Norman Crowhursts book Basic Audio Volume 2
  20. oldphaser

    Testing WOPLS "automated" by Jer...

    I haven't been able to find a complete 8903A manual yet. I am guessing that it might be similar to the 8903B. If my memory serves me correct, the 8903B was also the foundation for the Audio Precision test systems early on. Here are a few sentences taken throughout the 8903B manual...
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