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When the Phase Linear 400 series 1 amp was first being developed by Bob Carver in late 1971 it was handed off to Terry Phillips to put into production. It has been many years since I last talked to Terry. Terry also worked for Boeing like I did and he bounced back and forth between the Seattle...

Here is a link to an archived copy of the modifications that James VanDyke did to a Phase Linear 1000: https://web.archive.org/web/20190205224945/http://home.onemain.com/~jvandyke/id9.html I spoke to James a while ago. He was also close friends with a former Phase Linear employee and was able...

I am just completing the restoration of a 1000 series 1 that I have. There are approximately (81) electrolytic capacitors that I replaced with newer Nichicon's. The next steps will be to perform the test procedure steps in the 1000 series 1 service manual. However, it does not list all the...

Phase Linear used a variety of revisions of the PL400C pc boards before they started using the PL14 series of pc boards in 400 series 1 amps. I have (5) examples of the versions of the PL400C. In the attached photos below are (2) early versions with no notation on the backside of the pc board...

The switch that you have in the photo does not appear to be any switch I've ever seen in a Phase Linear amp. It also looks like the hole diameter in the 700 may have been enlarged to accept a replacement switch which is something I often see.

Are you sure that they are Argonne VU meters and not Midland's?

Glen, It is a simple question. You already performed the measurement. So you should already know the answers. I'm not asking you to go back and perform any further measurements. What frequency or range of frequencies (i.e. 20Hz to 20KHz) and output level did you use? Are the results noted...

I edited my previous post to include the following sentences in italics. .......The amplifier will not clip symmetrically when driving a 4 ohm load! As a matter of fact one side of the sine wave will clip far earlier than the other side. (It has been a while but I can't remember if it was the...

Glen Pardon me for the following ramblings..... just putting some thoughts down... Since you are posting incomplete specs, I thought I would ask you to elaborate further. Otherwise they are meaningless. As an example: THD+N in unweighted setting left .01% Right .04% What does this mean...

Glen, At what frequency was the THD+N numbers taken at? Let me guess (1kHz). How about rated output at 20kHz? What was the duration of test when you did the THD measurement? You mention that it does 465 watts into a 7.3 ohm load single channel driven. At what frequency and THD+N? Did you test...

bobdod, I have resisted posting for as long as I could. Unfortunately, the Phase Linear 200 series 1 amplifier is the worst/most unreliable amplifier Phase Linear ever made. I say this for many reasons. I will not list them all here. I hope you don't intend on using this amplifier to drive...

If my memory serves me correct.......... Most Phase Linear series two consumer products had a front panel with rounded corners. As an option, they were available with a "rack front panel" which had square corners. I am not sure if they had to be ordered with the optional rack front panel at the...

Cory's preamp is for sale on ebay: https://www.ebay.com/itm/124081333845

"Ruth" is more than likely Ruth Anderson. The only Ruth I know of that worked at Phase Linear. If the output stage has been replaced with White Oak Audio backplane boards then you might consider removing the sticker since there are no longer any traces of the work that she did.

Klipsch will be holding its annual "Klipsch Pilgrimage" March 21-22, 2020 in Hope Arkansas. http://www.itishifi.com/2020/02/klipsch-pilgrimagre-321-222.html https://community.klipsch.com/index.php?/topic/188924-pilgrimage-2020-itinerary/ https://community.klipsch.com/index.php?/

Bill Hanley posted these comments on Facebook 4 hours ago: A new book about a Boston/Medford Music Legend!!!!! "From Washington, DC, to Woodstock, Bill Hanley was the best sound in the solar system. Uber awesome and amazing." - Wavy Gravy, Hippie Icon, Flower Geezer, and Temple of Accumulated...

Phase Linear had (2) silk-screened versions of their 700B front panels. The 1st version had the meter range switch lettering arranged -20dB on the left side and 0dB on the right side. The 2nd version had the meter range switch (reversed) -0dB on the left side and -20dB on the right side. (see...

Just to be clear, I am not the Ed that is being talked about here.

If my memory serves me correct the caps you had in the photo were made by Temple(?) If so, I hope you replaced them. They had a very high failure rate.

Interview with Paul Klipsch & Klipschorns ; Out of the Corner & Into The Limelight by David Bardes (Vacuum Tube Valley Issue 13 Winter 2000) https://www.americanradiohistory.com/Archive-Audio-Magazines-Other/Archive-Vacuum-Tube-Valley/Vacuum-Tube-Valley-13.pdf