"west" wrote in message
news
I need to buy or build a bench power supply to test & design various tube
equipment (audio & ham). I would like it to be something like a Heathkit
HP-23 with voltage & current meters. The major problem with the supplies
I've come across such as the HP-23, is that the B+ current is appx. 100ma.
The bias & filament supplies are OK, but at times I need around 400ma for
the B+ out. Is there such a PS available, perhaps with tube regulation &
rectification or do I need to build from scratch? Any answers will be most
appreciated.
======================
An excellent design for a HV power supply unit can be found in QEX July
/August 1999 pages 50 -55
"A regulated 2400V power supply" ,by Al Williams VE6AWX

Even if you don't need such a high DC voltage ,the design is universal and
the output voltage is adjustable.
The design includes 2 SCRs in the transformer's primary winding circuit ,
with DC feedback resulting in a very stable DC supply voltage under large
load variations . Another feature is the 'soft' start preventing large
surge currents.
The author uses the unit to supply 2x813 tubes in a RF amp. requiring up to
1kW of power , with the no-load voltage of 2400V-DC dropping to 2397V when
load is 1kW.

Frank GM0CSZ / KN6WH