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It is an American company founded in the 1939 by Eugene Kulka. I believe they are still in business selling electric light fixture components and Mil-Spec terminal blocks. The non-polarized AC Jacks are probably illegal to sell today. That's why they are obsolete.

I am looking for an AC Accessory Jack for a customer's PL700 (the original amplifier, not the PL700B nor the PL700 Series II), Phase Linear changed to a different AC Jack after the PL700 and the hole spacing is different in the later amplifiers. These fragile Jacks were made by Kulka (P/N 221)...

The room is somewhat narrow at 12 feet, but it is deep at 30 feet. I stand in the back and smile a lot. The WOA Mode ONE is my daily listener since February 6th and I have not had a single issue with it.

Actual speakers, of course. According to the Owner's Manual, the recommended power for the Carver "Amazing" line array speakers is 1200 Watts at 8 Ohms. I am almost there...

Here is the updated Rev G Meter Board for the White Oak 1000 (front and back). The layout is a little different, but the real improvement is onboard voltage regulation to keep the Meter LEDs at the same brightness regardless of the power supply sag during heavy demands. The Rev G also features...

"Look at the size of that thing!" And yes, size does matter. I think I could get a 10 Gauge AC Power Wire into that blue connector. Note also that the Lower Right Mounting Hole is plated for Grounding via a 1.5uF/200V Panasonic Film Capacitor. Joe added a second LED to confirm relay operation...

The White Oak Audio PL14_20 Rev G1 Dual Mono Control Board can be found here: https://www.whiteoakaudio.com/estore.aspx You will receive the proprietary schematic after your purchase. Here is some history of the WOA Control Board. Phase Linear had become known as "Blaze Linear" or "Flame...

It is OK to dip your toes in with the upgrade of a PL14b control board, many of us have done that. But when you pick up a White Oak Audio "Dual Mono" Rev G1 Control Board with four precision, +/- 15V regulated power supplies onboard, through-hole plating and two-side heavy copper etching with...

Many of us started out with tubes. Mine was a McIntosh 225. Eventually, tubes became expensive and then very hard to find. It has become better lately, but for me the damage was done. I migrated to a Marantz 2285 and never looked back. Now, no more foreign amplifiers for me - I just stick to...

The handles and meters are worth the asking price.

Lee and I found that after listening to the WOPL amplifiers at Mach 10 for about a hour, the meter problem went away on its own.

I found these folks to have a good selection... Brent Jessee Recording Supply, Inc. www.audiotubes.com

Did you replace the the 10 Ohm resistors (R38 and R39) on the backplane? What is the voltage on R25? Is it positive or negative referenced to Ground? Is you lift on leg of D12, does R2 still get hot? The amplifier might be in a permanent state of "current limiting". If you remove the yellow...

But wait! There is more. True to Joe's tagline - "Always working on making it better..." Joe has shipped me two upgrade board kits to assemble and install in my WOA Model ONE. The first upgrade board kit is Revision C of the Power Control Board. The major change is the substitution of a massive...

Your output transistor mix is fairly standard for a forty year old amplifier. We see a lot of that. The service manual states to not mix transistor types in a column, so you are good - for now. If you want a reliable, optimum set of output transistors, invest in (12) Onsemi MJ21196G. Or better...

Welcome. We like pictures because it helps us to better understand what is going on.

You always give me the best deals... How about if you buy it and I send you a 50 pound box of used power supply capacitors?

The Left and Right channels were terribly unbalanced. After I installed the 12 (WOA) MJ21196G Output Transistors, the Left and Right channels were perfectly matched.

I believe many of us hold that honor...

The OPA1611 is a Bipolar input device and the cost (from Ti) is $4.10 each. But the downside for me is the SOIC surface-mount package. The OPA134 is a FET input device and the cost (from Ti) is $2.47 each. These are PDIP packages and make replacement (and OPAMP rolling) easier. Maybe Joe can...