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Old 5th April 2013, 04:56 PM   #51
GoatGuy is offline GoatGuy  United States
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Or... how about a trivial solution?

Bourns 70F501AF-RC open ferrite 0.50 H inductor as the cathode bias? Resistor of 1K across it, for HF response. It'll emphasize bass, for sure. Series resistance of 735 ohms nominal, so at most there'll be a 5 dB bass boost, without resorting to capacitors. Ferrite open-core gives response up to MHz region. Compact. Cheap ($2.65 on Mouser) per unit cost. Can be used in conjunction with LED bias if that's desired.

Dunno. Sometimes all the theory is nice, but practicalities of L-R circuits make themselves known after some thinking.

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Old 5th April 2013, 07:29 PM   #52
hpeter is offline hpeter  Europe
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Originally Posted by Cassiel View Post
Thanks guys. Rk is 470 uF. One 6SN7 per channel (parallel triodes). I will start with the changes described here - bigger output cap and, also, that cap in the feedback loop and see what happens. I don't have the equipment to measure the frequency response, alas, I'm just a tinkerer - far, far away from being a pro.
months ago i experimented with my headamp, i was checking various ways how to connect double triodes.
started first on scope with paralel triodes with plate resistor. not happy, i liked single triode bit more.
but when compared to srpp, immediately liked it. srpp has balls to give hi output voltage (more than standard connection), and benefit of low out impedance.
(more output voltage, without early coming limitation)
TASCAM US200 -> JJ ECC803/6L6 headamp -> Beyers DT990pro 250Ω # ..intrigued by screen drive & G1 FB sound ____
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Old 5th April 2013, 09:08 PM   #53
Cassiel is offline Cassiel  Libya
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Originally Posted by hpeter View Post
srpp has balls
Yes, and a nice and solid uppercut.

GoatGuy - your solution doesn't look trivial to me. I generally don't fool around with things I don't understand and I don't understand inductors; yes, that means I don't get your point but I have several little inductors from dead radios so maybe one day if I'm bored enough I will experiment....
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