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The Absolute Sound Issue 183 August 2008. "Bob Carver Interview"

NOTE: 30KHz low pass filters are used to "provide band limiting required by FCC for proof-of-performance broadcast testing". 80Khz are used "to reduce the effect of higher frequency noise present in the measured signal".

I made a typo in my previous post. It should have been 2N3403 not 2N3402. Joe, In your measurement results posted in your pdf.... After adjusting the bias for both channels to your nominal values, did you perform these measurements single channel driven? Or both channels driven at the same...

I can't quite make out the brand of electrolytic capacitors you have in the power supply in your amp. My best guess at the moment is STM. Is this correct? If so, you might consider replacing them. Although some on this forum might like to replace the AGX fuse-holders because they think the...

Everyone is entitled to their opinion. In my opinion is that anything that is no longer factory is a "resto-mod". As for the WOPL pc boards...... the Rev A board was probably the closest to being a copy of a Phase Linear series one PL 14/PL20 pc board with a few exceptions. Over the years the...

I have measured a number of Phase Linear amps and several WOPL Rev E amps. To say that you are "sure the distortion would be much lower than .12% at 1KHz/2KHz at 1 Watt" has no basis or foundation (in my opinion) unless you or someone you know has actually measured it and I have. As I stated...

Joe, You didn't quite answer my question. My post was soon after your initial post. How does one respond to something that is no longer there? Since I almost immediately deleted it and no further responses in this thread occurred until mlucitt responded at 2:56 p.m. Do administrators have the...

Joe, I deleted my post within a few moments of posting it after I realized that the title of your post falls under >Home>Forums>Phoenix DIY Central!> WOPL Tips And Archive. I would like to know how you were able to see a copy of it and then made a copy and then replied to it? Does it have...

Mark, There is some verbiage about setting the bias levels in certain versions of the 6/76 revision of the Phase Linear 400 and 700B series 1 amplifier service manual: NOTE: "Avoid setting the bias voltage level too high in order to obtain very low distortion readings--this may lead to...

I Lee, Is he the one responsible for the quote you use: "Synth percussion is deadly to children, house pets and shitty power supplies" ? Also, I seem to recall some WOPL amps you were selling on ebay many years ago for around $750? Was there anyone you know of that was selling them on ebay...

I added 2 pages of some scans: "Listings of Phase Linear Serial Numbers" to the link noted above. See also the example in the serial numbers for a model 400 versus a 4000. Ed

As a follow up to a more recent post, here is some additional information....... Although the date "February 1976" appears on the top of page 1...... Please note that the serial numbers on page 2 of the image below only reflects those that were "still covered under the 3 year warranty program"...

Lee, No I did not. NOTE: The photos in the previous post were taken from the ebay ad copy. I also went through all of Dean's documentation years ago and scanned whatever I didn't have and this version wasn't in his collection either. Many of my other original service manuals also came from...

I just purchased another 4000 series 1 service manual which I had never seen before. It pre-dates all the other service manuals I have including the "fast field service manual" which I thought was the first. The cover states "for serial numbers 1053-2000 thru 1000 forward". This service manual...

Ebayer "raindog911" (Steve E.) is also a member on this forum. His build(s) were documented on this forum several years ago. It appears he hasn't been on in a few years. Ed

I have a X-Mas party to attend so I only have a few moments.....otherwise I would check out a few more things before posting this. Anyway..... Peter, Just to be sure... you removed the original 2N3403 transistors from the "P" strap and installed a 2N5088? Joe, I haven't completed the...

"Hi-Tech Hippies" photo. From left to right: Dave Willard, Jim Hunsdale, A.P. VanMeter, Terry Pennington and Jurgen Tobys. NOTE: Jim passed away a few years ago.

The following was posted by a fellow on one of the Facebook groups.

Big enough to handle both channels of a Dual/D-500 being driven at the same time!

Lee, Another trick Dean taught me....... On the "standard backwall" use a pair of needle-nose pliers and try pulling on the bus wires next to each solder joint connection on the TO-3 sockets. Sometimes there are cracked/poor solder joints. You might also consider replacing all of the 10 ohm...