writes:

Steven,

Pretty cool power supplies, thanks for posting the .pdf file.

One question though, what is the pentode labeled V1 on the third
schematic on the fourth page. It is marked "6AM" 6AM5? 6AM6?

TIA,

steve

It is base diagram 6AM, which means any number of big horizontal output
tubes like 6BQ6, 6CU6, etc.

I was looking at the schematic for a Fluke 407. They did a smart thing. When
they paralleled tubes for more power, they series the filament, so that if
one burned out, the output went off rather than burning up the next tube.

Steve.
--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA