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Interestingly, a PL700 over temp condition does not remove all power from the amplifier as it does in the PL700B and PL700II. This is because there is still a path for a small current to flow in the circuit of R72 (4.7K or 3.6K in Eric's amp) and the NE-2 lamp, which are parallel to the over...

Eric, how was the "Hi Temp" light wiring accomplished?

$8.13 each, if you buy from Mouser plus the $7.99 shipping... Joe has a better price.

I explained to him in a PM that the F means Fairchild Corp. All the outputs are relabeled by Phase Linear to read PL909 and the 914 and 910 are date codes 9=1979 and 10 and 14 are weeks of manufacture. I believe this is true because we used Fairchild semiconductors in the Navy.

You are officially the Mad Scientist of RF Generators.

Mouser has them, about $9.00 each: https://www.mouser.com/ProductDetail/onsemi/MJ21195G?qs=HVbQlW5zcXWtNoqJbrBgZA%3D%3D

Did you make any measurements on the transformer? I wonder if it is wound similar to the PL700B?

In my humble opinion, the RCA 410 or RCA 66546 (they are the same devices) driver transistors are the best for that application. Others may have a different opinion. I have some if you need them. (Lee is faster on the keyboard than I am.)

Your PL400 Series 2 is a middle release version, likely 1979 or early 1980. The PL400 Series 2 was released in 1978 and you could still buy one new in 1981 for $800.00. If your amplifier has PL909 Output Transistors it is wired for quasi-complementary operation. The current replacement for...

You don't. But insurance companies will hire a $50,000 arson investigator to save a $150,000 homeowner's claim. My stepfather was in the insurance business and explained to me that he has seen too many people become homeless with no money just for things people take for granted or don't worry...

No one does, until it happens... When the original control board fails and the amp latches up and sends 80VDC to a nice big speaker and the woofer voice coil melts and catches the cone on fire, then the drapes... Then the insurance company reads the Fire Marshal's report about the fire starting...

Another opinion (everyone has one): You will often spend an inordinate amount of time (time is money) chasing problems on an original Phase Linear control board. Then get frustrated with lifted solder traces, burned board, broken wires, ordering new parts, etc. Ask me how I know... Sometimes it...

Yup, some customers just don't get it and will never experience the joy of WOPL, like we do every day.

Your friend's amplifier has tired Bias Transistors. These are 2N3403 devices affixed to the inside back of the chassis and are use to vary the Bias voltage of the amplifier by using the heat characteristics of a transistor. This keeps the amplifier from "thermal runaway", rather, just inaccurate...

All 120V electrical appliances in the USA are IEC Class 1 (basic insulation), or Class II (double insulation) like a plastic 1/4" drill housing.* Per the International Electrotechnical Commission (IEC), "A safety ground is required for all Class I devices." This requirement did not exist when...

These Phase Linear amplifiers are designed to be switched on with at least 117VAC. We only use the Variac as a testing device when the status of the amplifier is unknown or it has been many years since the amplifier has been turned on. The "Turn On voltage" is not a specified value and could be...

We are an interesting bunch...

Funny how this post became about coffee... Anyway, just to close the loop on this thread - with the assistance of member Hexis22, who sent me a list of potential HD dealers that showed stock in the database; I found my Engine Gasket Kit. At the bottom of the list of 24 dealers, the third to the...

Pictures - or it never happened...

But not the WOA "Dual Mono" Rev G1 Control Board?! Seriously, you are missing out on what the amplifier can deliver.