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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...

Lee, You didn't mention which board you were touching so I will assume it is the Rev D board and not Don's DCP. Follow the disassembly procedure in the Phase Linear 400 service manual..... "Remove the (2) hold-down nuts from the Rev D board, flip the circuit board over and gently pull towards...

Lee, Now that you've repaired the amplifier..... Did you ever get a chance to re-test the amplifier at rated output both channels driven 20Hz-20KHz? Ed

When Dean worked on Phase Linear 4000's he would send a set of unpackaging instructions along with the preamp.

I have never been a big fan of mechanical connections. Particularly after my experiences with Molex connectors on Phase Linear 4000 pre-amplifiers. I also have never been a big fan of double-sided through hole plated pc boards. In many cases you have to decide whether to try and save the board...

Marco, Yes there were problems with the rear connectors (RCA jacks) cracking and breaking. The early 4000's that used Molex connectors between the front panel pc board and motherboard had issues. Most of these units did not have the slide out bottom cover like the later units had which also...

Marco, Lots of comments and questions from your (3) posts. It will take a while to reply to them all. I took a look at my (2) 4000 series 1 (Lynnwood Washington) owner's manuals and indeed they incorporated the comments about the "extra long connectors". However, I didn't see anything about...

Joe, Regarding TO-3 style sockets which were used in Phase Linear 400's and 700 series amplifiers: The first generation of sockets Phase Linear had square corners were made by (United International Dynamics Corp) UID Electronics division of AMF (UID part number PTS-10E). UID had a number of...

Lee, As a side note: Larger wattage resistors are less noisy than smaller wattage resistors. Ed

I only took a quick look at the documentation I have for the Rev D before I typed my previous posting. What resistor size is for a quasi-comp and which was used for a fully comp? I thought the 10 ohm was quasi and the 44 was for fully-comp? Where did the 22 ohms come in? So is it that the (2) 44...

Marco, I just acquired an early Edmonds, Washington version of the 4000 owner manual. In it is a single page "Phase Linear 4000 Addendum" I have never seen before which talks about a number of things including the following: I. "PHONO PLUGS: The phono plugs with extra long center connectors...