[split] Valve testers

[ppppenguin]

My psu has a pair of 5b254m.

Here's the SRS153 schematic. The CV428 is equivalent to the 5B/254M: http://www.r-type.org/exhib/aab0149.htm As you can see, there's no attempt at stabilisation except that the cathode followers may have a lower output impedance than the raw supply. Note all the stopper resistors to stop the valves, which are designed for RF service, hooting like mad.

These are very good, solid PSUs. Not an electrolytic in sight. All high quality paper capacitors.