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Nice!

Oh, it definitely needs a good scrubbing with DeoxIT and an old toothbrush.

I realize it is an LCR Meter. Which one?

Follow grapplesaw, he is the D500 expert here in the forum.

What application did you use to get the results you posted above from your speakers?

Check the continuity of the woofer itself, both inductor coils and replace the capacitors - they are past their useful life. Sometimes they can test OK, but with variable frequencies, they breakdown.

Data from my "Bench Mule" PL400. Over 100 insertions and removals over the past five years.

You have come to the right place, we will get this sorted out even if you have to completely disassemble and then reassemble your PL4000 preamplifier and PL400 amplifier. Don't worry, it will be great!

Welcome, by now you have been infected like all of us. We speak Phase Linear and Carver around here, but almost anything else is good too.

Perry, where do you get this nonsense? I have Manley Labs RCA Jacks on both of my PL400 Bench Mules (one for testing WOA Quasi Comp Control Boards and one for testing WOA Fully Comp Control Boards). I have assembled and tested about 60 WOA Control Boards, so each jack gets inserted and removed...

My five brothers and six cousins were all Deadheads, growing up in southern and northern California during the Grateful Dead heydays.

The machine I used had a primary preheat of 350F and a secondary preheat of 480F. Total preheat tunnel length was 4.2 meters. The solder bath soldering temperature standard typically falls in the range of 240°C (464°F) to 260°C (500°F) with a max of 280C (536°F). The wave was a bit more than...

Manley Labs makes and sells these RCA Jacks for $7.00 each. This other company must have bought a bunch and now wants to liquidate them, no issue there. Manley Labs makes the highest-rated Studio Recording equipment in the world, so cool your jets, Perry. Manley Labs RCA Jacks are made...

Eric is right, just cut R1, C8, and R2, C9 off the DCP Board. And thanks to Dr. Otto J. Zobel of Bell Telephone/Bell Labs for inventing and patenting an "image impedance" filter network that reduced voltage from reflecting off the woofers and back into the amplifier in about 1920.

Tim consider that in a production environment the circuit boards are run through a solder bath with molten solder flowing under the boards like water. Likely 600-700 degrees and the solder bath could be 24-36 inches long with a conveyor speed of 4-6 inches per second. In other words proper flow...

Don't waste your money on RCA Jacks. Just get these Manley Labs Jacks for your WOPLs and the WOA Model ONE: https://www.lunavellegrove.com/product-p-811293.html If that price ($1.99) is still good, it is a steal.

I should have said the KT120 tubes run at 650 VDC in Pentode mode (above). Sorry, brain is faster than fingers...

Thanks Ed, exactly what I was looking for. Mark

I would leave it as a museum piece...

To divest yourself from all things Google, simply smash your phone, disconnect your computer from the Internet, and in severe cases; go off grid.