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Here is a picture of the PL20 control Board. Here is a picture of the PL20A control board. Minor layout differences and a few more capacitors on the PL20A.

Perry, I like how you wrapped the wires around the center posts of the RCA Jacks. It makes for better alignment than stuffing the wire inside the center post.

I believe I have four PL20 Boards. You want PL20, not PL20A or PL20B, right? I have those, too.

Let's get a S/N 15 out into the world!

Lee, do those picture qualify for a "Nuke" failure?

Somebody was listening at full volume into 2 Ohms...

I was only commenting on the response from Old Phaser. My post has nothing to do with any piece of equipment including the Rowland. This was related to the Phase Linear Service Bulletin referencing the Triad G-336 Autoformer which is no longer available or in production. I believe it was the...

Bad potentiometer? Replacements are likely available.

Lots of copper in that chassis.

I think Lee is running his WOA Model One amplifiers as bridged monoblocks. Lee is that right?

Schematics are normally the rule. But many schematics were drawn by engineers before the unit went into production. Then changes were made (not always good) but mostly to improve the actual performance over the design performance. For electrolytics in the Power and Ground circuits, mostly...

There you go Joe, a new project...

I wish these Triad transformers (autoformers) were available today. This is the best substitute in my opinion: https://lightningboyaudio.com/store/p70/UJ20_line_input_transformer.html#/accounts The LBA-UJ 20 is the first official transformer design released by LBA. It's name draws from the...

My research indicated that electrolytic capacitors have a lifespan of 25-30 years. Less if high heat or high stress environments. They should be reformed (working voltage, or a bit less but not maximum voltage, brought up slowly and held for 24 hours) if idle for more than a year for longest life.

From the Caig Laboratories website: DeoxIT F5 - 5% DeoxIT® Fader (active ingredient), 75% odorless mineral spirits (carrier solvent), 20% propellant. Spray provides flushing action. $28.00 for 5 oz. DeoxIT F100L - 100% DeoxIT® Fader, no solvents. Not sure if faders have plastic and/or metal...

The ALPS potentiometers are probably some of the best in the audio world. Typically very accurate and reliable. I would reflow all the solder junctions related to the audio signal (volume pot, balance, tone controls, RCA jacks, etc.). The fact that the problem occurs in only one channel points...

The 100K stepped attenuator (Level Control, Volume Knob) is in parallel with a 10K (Phase Linear) or 39K (White Oak Audio) pull down resistors. Using Ohms Law, we can see the input resistance (impedance is frequency driven) of the PL400 is 9.999 Ohms (Phase Linear) or 28K (White Oak Audio). In...

If Lee sold all his spare parts for $1.00, he would be a millionaire.

Translation - No chemicals, the switch has been opened and I am therefore against it in this case.

My upgraded PL2000 Preamplifier signal output comes right off the output of a Texas Instruments/Burr Brown "SoundPlus" OPA2134 SMT OPAMP (formerly RCA 4136) via a BrownDog adapter P/N 060601 and through a Panasonic 22uF/63V DC Blocking Capacitor in each channel. There is no pulldown resistor. I...