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Glen, I see now that it was probably just the light angle in the picture. The .33uF Panasonic metal film caps on the 12 and 11 pin in for both channels is a good idea for an amplifier that does not have the WOA Backplane Boards installed. The PL400 Backplane Boards have 7.5uF of capacitance...

If you have two fans you can wire them in series so that each fan sees about 60VAC. This is enough to spin them at half speed, which is very quiet, but they still move enough air to keep things cool. You can bypass the fan speed control on the amp and let them run al the time.

Sean, Two thoughts come to mind after reading your very detailed posts. First, I have an older, WOPL upgraded, PL700B (S/N 1705) that I use every day in my main Audio System (upgraded Phase Linear 2000 preamplifier and Carver "Amazing" speakers) for background music streamed from space (XM...

I spied another possible mod to the WOA Rev G1 Control Board. What capacitor are you using for C4L and C4R? They do not look like the Nichicon MUSE 470uF/25V capacitors that I have been using.

I did see the extra row of power transistors and the unique Bias Transistor mounting. You are the official Mad Scientist of Phase Linear amplifiers.

Glen, nice work with that Zener diode addition. I don't see a downside (i.e. noisy diode switching or heat generation) and the rating of the 1N5366 diode is 5 Watts, which should be enough to give it long life. If Joe specified 39 Volts (an odd number) he must have had some engineering technical...

The unconnected Gray Wire is the Center Tap to the Lighting Circuit voltage of 2X6V, so that you can get 12V to the LED Light Bars. This Gray Wire is sealed at the factory and should be left alone. The transformer looks typical to me.

I tried the link in the instructions above but the "almighty Google" still took me to the accounts page which requires me to send them money for an account that does not exist and I do not want. I am back online with my original email address by downloading the Firefox browser, deleting Gmail...

I would test those capacitors first.

Glen, Can you elaborate on the double diode setup at D52 and D53 along with any other mods you did on the WOA Control Board? Might be something I want to try...

This help page asks me to: 1. Sign in to the Admin Console. How do I sign in to the Admin Console? What is an Admin Console?

That PL700 has seen several upgrades and by the sticker on the right side of the chassis, it looks to be part of a large order, most likely for a professional sound reinforcement company. I would say it was from Clair Bros. Audio, but their Faceplates were black with their name on them. However...

I am not signed in, the login page defaults to "Person 2" and when I type mail.google.com in manually, the URL automatically changes to https://accounts.google.com/v3/signin/challenge/pwd? I think it sees my IP address. Can I tunnel through a virtual web page or use a proxy or even a VPN?

None of that is all in one place, I had to research several different sources. I believe it is mostly accurate.

Still learning the AP Portable One Plus... I was running 1kHz, figured it was the most appropriate/comparable. I wish there was a class/school for the various operations of the AP machine. I would sign up in a heartbeat. Maybe I should just book a flight and spend some time in the Laatsch...

Don, you are correct, the thermal switches do not run on the DC Rails. There is a dedicated 18VAC Toroid transformer that is rectified to give 24V Auxiliary Power on the Power Control Board. The magic is that the two Thermal Cutout Switches sit at Ground potential. If this Ground is interrupted...

Yeah, So I blew the rail fuses on the first trip to the Power / Load test... Joe told me I was "clearly" into the SOA Range... Testing continues, but I did record a Residual Noise value of 99.3uV at Minimum Volume and 442.9uV at Maximum Volume. The THD+N on Channel A was .0064% and .0037% on...

Chrome is my browser. I have tried others with the same result.

Vernon, Clearly you are a fan of the Series II Phase Linear. So this is all your fault - When Bob Carver left Phase Linear in 1977, it signaled the end of the power amplifier company. The Phase Linear Series II was introduced in 1978, just before Pioneer acquired Phase Linear in 1979, by the...

Was it an LF356? I have seen them in DIP-8 and TO5-8 configurations. Can you plug the TO5-8 in a DIP Socket? I have never tried it. Nice troubleshooting. I have yet to see a bad OPAMP, just "tired" ones.