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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: grid drive and diode sound posted by Michael Samra on March 13, 2007 at 07:11:40:
Thanks for reply. Yes this is for guitar, well guessed!
B+ is 360volts and the screens are at 300volt.
I love the sound of this amp and I think it's because of the 6922 driving the output with an IT. The 6922 provides reasonable low impedance for a slight positive grid drive, and the IT gives me the two opposite phases for PP operation.
The output is cathodebiased, and as it starts to clip, the cathodecap charges a bit, so there is some grid current going thru.
The nasty sound seems to happen around 200Hz, like when hitting the 1st string/7th fret together with another note. But I am having trouble duplicating on the bench so I havent found the real source of the problem. My guess is the grid is driven hard, but the driver cannot source enough current and there is some nasty grid-clipping added to the otherwise comfortable clipping of the output tubes.
I guess I should use a beefier IT and parallell a couple of 6922 and see if it helps, but beefier IT are expencive.
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Follow Ups
- Re: grid drive and diode sound - Nikko 07:23:38 03/13/07 (5)
- Re: grid drive and diode sound - Pär 08:49:21 03/13/07 (2)
- Re: grid drive and diode sound - Nikko 12:20:10 03/13/07 (1)
- Re: grid drive and diode sound - Pär 23:56:19 03/13/07 (0)
- Re: grid drive and diode sound - Triode_Kingdom 08:26:32 03/13/07 (1)
- Re: grid drive and diode sound - Nikko 12:22:24 03/13/07 (0)
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