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AudioGeek 29th June 2004 08:18 PM

power supply for 6922 mu follower
I need to design a power supply for a 6922 based mu follower.

Will have a 6922 triode loaded with a choke and a MOSFET as a source follower.

Dunno about power supply.

chokes, VR tubes, SS vs tube? etc...

maybe a regulated supply... dunno.

a very quiet supply would be good.


voltage needed... hmm.... maybe 150. (perfect for VR tube).

current?... 50mA per channel as a guess.

Thanks for ANY help!

Sch3mat1c 29th June 2004 08:36 PM


Sch3mat1c 29th June 2004 08:38 PM

By which I mean, schematic plz.

As a guess, you won't need more than a steaming 15mA per channel, if a channel consists of a single mu stage. 5mA if ran from only 150V (0D3/VR150).


AudioGeek 29th June 2004 08:45 PM

try this:

look up alan kimmels mu-followers.

He has a design with a triode loaded with a MOSFET configured as a source follower.

In that design there is a resistor that sits on the plate of the triode connected to the mosfet.

Instead of this resistor i was going to put a choke.

My question is this:

I want to run my 6922 at 90v and 6mA per channel.

The mosfet will run at 40mA per channel. with the 6922 at 6mA and a resistor at 34mA.

what would be the best power supply for this?? reliable and quiet and sounds good....


Sch3mat1c 30th June 2004 02:15 AM have a series circuit, current IS EQUAL. You have to have something sinking the extra 34-6 = 28mA if you want to run the MOSFET there.


AudioGeek 30th June 2004 03:25 AM

i think you mis-understand.
total current through mosfet is 40mA.

total current through 6922 is 6mA

total current through resistor in parallel with 6922 is 34mA.

just read the alan kimmel stuff.

anyway, I DON'T care about the gain stage... just the power supply.

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