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RE: This long thread just tells me what commercial SETs aren't....

Thanks for your reply Dennis.

I can see you get attacked quite a bit - but I take note that you actually have a commercial product which is by all accounts is well reviewed, and having read some of your previous history wrt theatres and studios, I have respect in my questions. I think that would be welcome to you as it seems to be overlooked, or ignored by others.

"Maybe we better define filament bias-- what supplies the bias
voltage in your example? Then one could comment..."

Sure. So for example I have a direct heated input stage which sets up at 110V plate, 3mA Ip and around -4.5Vg. Rp is ~10k. If is 250mA, give or take.

With cathode bias, the Rk would need to be 1500 ohms and (at least in my application) require a bypass condenser.

Being direct heated, I choose DC heating using a commercial kit which does its best to present high impedance to the filament so that the AC signal does not come from, or enter into (conventional vs actual current flow) the DC filament supply.

What that enables is the filament current to be shunted through the bias resistor, so from 3mA it is now 253mA.. and a ~20 ohm 12W resistor suffices.

I hope this answers your question and perhaps is different from what you were thinking.

FWIW though, I have heard some pretty good Japanese amplifiers which run a more traditional fixed bias output stage.. but there is probably more in their recipe than a -ve supply for the output stage (or split supply to the driver in their case as it is).

Respectfully,
Shane

PS. Actually would you mind sending me a PM via the Audio Asylum system (if it works that way). I'd rather learn something that I can use rather than get all emotional and throw the opportunity away.

Thanks.








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  • RE: This long thread just tells me what commercial SETs aren't.... - shane. 09/3/1723:47:46 09/3/17 (0)
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