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I found this link for WOPL Builders. I think this is a good price for Buss 10 Amp fuses, Made in the USA. I bought a box of 100 because $0.25 each is a pretty good price, I think. https://www.ebay.com/itm/231303032358?hash=item35dabc2e26:g:zq4AAOSwxH1T5PcN

I am posting this picture of a Customer's PL400 Series II (with his permission). I am quite proud of myself for this work. He said no holes in the chassis, but would allow one for a chassis (Earth) ground. I expanded it slightly and installed a 12 Amp miniature Raytheon switch, from the Space...

Former military members will recognize this as "Professional Development" and I think it helps to share information and keep our skills sharp. All are welcome to play along but this is directed to WOPL Builders, you know who you are... Date: March, 13, 2021 Scenario: WOPL 700B upgraded with...

I have a customer who lives in Orlando, FL with a Revox A77 Mk II. He says it need "refurbishment" whatever than means in the world of vintage analog tape machines. He is a good guy who will pay good money to anyone qualified to service his tape deck. Let me know and I will send you his POC...

Does anyone else use a dab of Dow Corning 340 on the WOA Control Board heat sinks, or under the Bridge Rectifier? I can't help myself, when I see a heatsink; it gets Dow 340...

I just received a Customers PL400 II today for the WOPL Upgrade. Look how nice this unit looks. I wish they all came into the shop looking like this one.

I found this item for WOPL builders: https://www.ebay.com/itm/303032055462

You know that in 15 minutes, there is going to be some serious Mach 10 happening.

I have been trying to find decent RCA Phono Jacks to fit in the 1/2" holes of our PL and WOA chassis. Most of the 'good' RCA jacks (Cardas, Kimber, Neutrik) are 3/8" hole size. There are "audiophile" 1/2" jacks that cost $98.00-$125.00 each and there are Chineeeese imitation jacks that cost...

I stumbled on the World Pro Audio website today. Has anyone else seen this? He has an extensive mod to the PL400 (one originally assembled by our friend "Linda" at Phase Linear) Control Board and adding the White Oak Audio Bulk Capacitor Kit. I don't know if he realizes there is a new Control...

I am attaching a list of tools I have found useful or necessary for building WOPL Amplifiers. For the builders out there (you know who you are) are there any corrections, deletions or additions you would make?

To All, I was disassembling a PL700 recently ("tear down" and "gutting" are such strong words). I noticed a broken fuse holder and examined the item very carefully for the first time. These are the well-known Buss devices. Cooper Industries was an American worldwide electrical products...

I was going to respond to this eBay posting, but I thought I would post here first: Phase Linear Repair And/Or Upgrade Discussion Document https://www.ebay.com/itm/Phase-Linear-Repair-And-Or-Upgrade-Discussion-Document/293677214374?hash=item446086aaa6:g:bhMAAOSwmkBfGnRP Hello?

My first foray into a complete rebuild of a PL700 Series II was quite a learning experience, I have been a PL700B guy until now. This rebuild included a new chassis, 120V/240V selector switch, WOA Backplane Kits, WOA Control Board Kit, WOA Cylon LED Board Kits, WOA bulk capacitors, new power...

Has anyone looked at a Carver C-500 to see if it could benefit from a WOA backplane kit and new WOA Control Board. From the outside, the amps look very similar. I have not seen the inside of a Carver C-500. Anyone have any nudies? This one...

Looking to send a unit to WOPL Sniffer. Does anyone have a Cabbage case they are not now using and could you send it to me? I can send PayPal to you to cover shipping. Thanks! Mark Lucitt 4234 Lakeside Drive Jacksonville, FL 32210-3306 703-927-4133

Audio Magazine Volume 56 Number 2 February 1972 (25th year) It took me awhile to re-type this article I had to take photos of the embedded pictures and save the images into the file. Worth a read though. If anyone has an earlier (1970-1971) article on the PL700, I would like the link and be...

Huge webcast auction of electronics coming up soon - 6/3/2020 10:00. Here is the link, catalog button available: https://tinyurl.com/yd9fttna

Doing some research recently and found in the PL700II schematic, there are two Q110 transistors on the wall of outputs. Did that ever get resolved? Typo? Just curious. Also, I saw this modification in the references. I don't know the source. Has anyone thought about this or tried it? Finally...

Got a 1973 PL400 for a WOPL upgrade and then I found these "tweeks" that the owner forgot to mention: Does this mean we have a problem? How long do PS caps last in this configuration? Notice the driver transistor on the left, it let some smoke out from under the mica... Dang, a PL400C2...