ZEN working - Page 2

GRollins · 30th May 2001, 02:20 AM

Jam,
Increasing the drive is a good idea, but I don't think it's the cure to this problem as the sonics were pretty much the same even at low volume, hence not drawing grid current (AB bias).
Mind you, the sound of the amp would probably have satisfied a lot of people, even with the current source(s). It's just that I was determined to do better, sonically. Resistors happened to be the solution. One of these days, I'll get around to trying a resistor (& negative rail) under the front differential...when I get time...

Grey

jam · 30th May 2001, 02:30 AM

Grey,

A volatge doubler taken off the bias supply might work, assuming that you are not using a self bias output stage.

Jam

GRollins · 30th May 2001, 04:06 AM

Jam,
Now, that's an idea that I can live with!
(Clearly, you aren't going to be happy until you've got me working 48 hours a day...*sigh*...actually, I'm smacking myself in the forehead for not thinking of it myself.)
I'll have to drag out the schematics and see what the raw AC going into the bias regulator is, but it should work just fine.

Grey

30th May 2001, 02:30 AM	#12
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Supply for current source Grey, A volatge doubler taken off the bias supply might work, assuming that you are not using a self bias output stage. Jam

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30th May 2001, 02:20 AM	#11
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Jam, Increasing the drive is a good idea, but I don't think it's the cure to this problem as the sonics were pretty much the same even at low volume, hence not drawing grid current (AB bias). Mind you, the sound of the amp would probably have satisfied a lot of people, even with the current source(s). It's just that I was determined to do better, sonically. Resistors happened to be the solution. One of these days, I'll get around to trying a resistor (& negative rail) under the front differential...when I get time... Grey

30th May 2001, 04:06 AM	#13
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Jam, Now, that's an idea that I can live with! (Clearly, you aren't going to be happy until you've got me working 48 hours a day...sigh...actually, I'm smacking myself in the forehead for not thinking of it myself.) I'll have to drag out the schematics and see what the raw AC going into the bias regulator is, but it should work just fine. Grey