You are quite correct about the limits, dial back Va to ~260V if conservative.
In testing used 6P14P or EL84, momentary exceed for minutes Pa is not critical unless very nice old Telefunken or Mullard.
In testing used 6P14P or EL84, momentary exceed for minutes Pa is not critical unless very nice old Telefunken or Mullard.
I should have found a way to inject a 1v 400hZ sine wave with a chinoiserie ... the problem remains that the whole circuit needs a myriad of multimeters to check all the parameters ... I didn't understand what sense it makes to want to test an EL84 with 300v on the plate if you can test it with 250v both on the plate and on G2.
Can measure with only one multimeter, but easier with two, true.
The plate supply voltage for testing pentodes is not critical, however I always test pentodes with Va 10 or more volts greater than G2, whatever the tube type is.
The plate supply voltage for testing pentodes is not critical, however I always test pentodes with Va 10 or more volts greater than G2, whatever the tube type is.
For the voltage regs--Take a look at the Russian L1-3/L3-3 tube tester PSU stages, excellent performance, very cheap tubes, and quite simple!
--2 or 3 6p1p in parallel to supply the TUT with plate cuttent up to 150mA....
--2 or 3 6p1p in parallel to supply the TUT with plate cuttent up to 150mA....