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Bush Radio DAC 90A
#2

Arran


Depends on your load. It is a Greinacher scheme, so maybe it does not matter as the voltages are simply added to each other and if one is lower than the other, so what, it simply is losing a few volts due to higher impedance of the tube.
This said, unless you want to keep the radio AC/DC and use that tube's filament for that reason, you could use a cap to trim the votage to the load of one less tube.
Or you could use the tube's filament, but then not use the rest of it, and use 2x1N4007.

Also, look up my Telefunken thread from a year ago: there is a thing about the common going to one of the lines, without which there will be hum.
I also experimented with the input and output caps; their ratio will determin the output voltage.

https://philcoradio.com/phorum/showthrea...telefunken

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.


Messages In This Thread
Bush Radio DAC 90A - by Arran - 04-21-2024, 07:11 PM
RE: Bush Radio DAC 90A - by morzh - 04-21-2024, 07:47 PM
RE: Bush Radio DAC 90A - by Arran - 04-21-2024, 08:38 PM
RE: Bush Radio DAC 90A - by morzh - 04-21-2024, 09:39 PM
RE: Bush Radio DAC 90A - by Arran - 04-24-2024, 11:27 PM
RE: Bush Radio DAC 90A - by Arran - 04-28-2024, 03:13 PM
RE: Bush Radio DAC 90A - by Arran - 04-30-2024, 01:48 PM



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