First you need to make sure you have TDSL.. (EVERY TUBE PERSON NEEDS TDSL)
http://www.duncanamps.com/tdslpe/download.html
(the following is ONE way of doing it fairly close)
Then you bring up the EL84, go to (short data)
look down to the 6th row, you'll see EL84 running pentode with a voltage of 300,
you'll see it has a shared cathode resistor of 130ohms, double that same value for
a single tube to get the same current, so 260ohms, pretty close to the schematic
of 270 ohms, now look at the current 72-92, so figure the middle at 82, that is for
2 tubes which a single ended stereo amp will have, now look at the screens current,
8-22 so call it 15. now you have 82 + 15 for 97 on the output section.
Now bring up the 12AT7, go to (Data sheet links)
Go down to the 3rd row, click it to bring up the data sheet, at the top of the second
page you'll see (plate supply voltage) of 250v with a current of 10ma when using that
200ohm resistor, now here your running 250 ohm but a little higher supply, but I would
guestimate 8ma for each tube for 16 total. (Probably less with the RC to the front end)
(for sake of discussion)
So now you have 97 + 16 = 113 add a couple extra call it 115 for the entire amp.
He says MINIMUM 20H choke at a 50ma, were running over 100ma here but still that
choke is going to have a decent resistance like say 300ohm.
So the attached pic is what I would presume the designer was intending on that supply.
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WHEW, please don't have me do that again............
Stan
