Re: The Potato Amp?


"Andre Jute" <fiultra@xxxxxxxxx> wrote in message
news:1141000733.831867.177510@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:
: John Byrns wrote:
: > In article <1140933911.866627.93680@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, "Andre
: > Jute" <fiultra@xxxxxxxxx> wrote:
: >
:
: > Hi Andre,
: >
: > While the 417A doesn't particularly stir my audio passions, I am starting
: > with your SE 417A "potato" amplifier as the baseline. From my perspective
: > the specifications of an ideal push pull "potato" amplifier would be a
: > maximum output of 2 Watts, which could be driven to a 1 Watt output with
: > the 2 volt peak signal from a CD player that you quote.
: >
: > The input transformer can have a voltage step up, the transformer I have
: > in mind has a voltage step up from the primary of 3X grid to grid.
: >
: > I have in mind some sort of dual triode tube with an anode resistance some
: > where in the neighborhood of 1,700 Ohms, a transconductance as high as
: > possible, and an anode dissipation rating sufficient to provide a 2 Watt
: > output.
: >
: > Any thoughts?
: >
: >
: > Regards,
: >
: > John Byrns
: >
: >
: > Surf my web pages at, http://users.rcn.com/jbyrns/
:
: I can't think of anything like you want.
:
: What comes to my mind instead is the 6SN7GTB which will give you near
: enough one watt of very clean power in PP.
:
: Andre Jute
:
It could be done with a JJ ECC99, with a balancing step-up tranny
about 2W possible in PP (each Pa=5W, close to the 6BX7)
with 2Vtt input upped to 12 Vtt.

Rudy



.

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