The valve audio afficionados / suppliers also offer both wisdom and components, e.g.
https://skillbank.co.uk/psu/ and many other sites / blogs https://www.amazon.co.uk/Designing-Power-Supplies-Amplifiers-Second/dp/0956154549 https://shop.elsevier.com/books/valve-amplifiers/jones/978-0-08-096640-3 and many other titles https://www.ampmaker.com/shop/vcb-vvr-voltage-control-kit/ and numerous other kits for worked examples https://www.thatsaudio.co.uk/product-category/valve-amplifier-transformers-chokes/amplifier-valves-accessories/power-transformers/ Regulation is typically effected by a high voltage N-fet or similar device see e.g. - https://www.microchip.com/en-us/product/lnd150# etc etc - https://www.ti.com/lit/pdf/snva020 etc etc Martin -----Original Message----- From: Paul Koning via cctalk [mailto:[email protected]] Sent: 13 October 2023 14:57 To: [email protected] Cc: Paul Koning <[email protected]> Subject: [cctalk] Re: IBM 727 tape drive > On Oct 13, 2023, at 4:41 AM, Christian Corti via cctalk > <[email protected]> wrote: > > ... > And the interesting part will be to build the DC power supply for the many > voltages (-270V, -130V, -60V, +140V, +270V) and the heater supply. A good source for information on how to do that would be an older edition of the ARRL Amateur Radio Handbook. Those can be found, from used book dealers. I have a 1954 edition that would do well, though one from the 1960s is likely also good (perhaps better since the earlier ones would have vacuum rectifiers, which in a newly built supplly isn't optimal). Chances are those voltages don't need to be tightly regulated, not like trying to build a TWT supply... so the main thing is the transformer(s). Those too can still be found, or can be built; Hammond (Peter Dahl) is still in that business. The heater supply is typically just a suitably large 6.3 or 12.6 volt transformer. paul
