Hi Mark -- As of this evening, I have found transistor covers for the 8-fin heat sink that I am transplanting onto my PL400. I will therefore should have the two transistor covers from the now-defunct 4-fin heat sink available for you. Once I get everything in hand and triple-check it, I can send you the two covers. Please send me a PM and let me know your mailing address.
-Jon
-Jon
"Spraying the Innards" won't do anything. When resto'ing one, you do what you think needs doing. Wires? Maybe, new transformer? Sometimes, new meters??? Sure...... New Switches and fuse holders?? Yesssss.......... It's like restoring an old car, you rebuild, repair, clean, replace whatever needs the attention. If all else fails, spray bomb it and and tell everybody you restored it but lost the receipts. 
I like meters on a Variac (not really on an amp). When using one with meters, you can tell when issues are occurring without having to hook up a bunch of test stuff. But, you got to know your equipment and recognize how they act when working correctly (Current/Wattage draws) and by paying close attention you know if you need to pull out the test equipment. I only use the DBT on fresh amps. I think Staco made a couple metered models and I wait to find what I WANT, not what I pay for it. It's better to be satisfied than wishing you would have scored my dream machine.
