DEC H7140 (11/44) power supply revisions and general advice?

[tony duell]

> 
> The bias voltage is generated by the chopper on page three in conjunction
> with T1 and some rectifying diodes on the motherboard. Then it is feed back
> to the bias board on J2:2 to produce the 5V. (page 2)

Yes...

It's not totally obvious at first glance, but this is yet another SMPSU with the 
chopper on the Bias/Interface board. The transformer on the baseboard is
not a mains-frequency one.

-tony