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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: Grid leak R in PP output stage posted by Uncle Clyde on January 25, 2007 at 10:07:03:
The maximum value for the grid leak resistor depends on the tube used and the type of bias. You have to check the data sheet. For the KT77 it is 1 meg for cathode bias and 1/2 meg for fixed bias. That is for total tube wattage less than 28 watts. If operated over that derate by 50%.The higher the value of the grid leak, the easier the job is on the driver and the smaller the coupling cap needed. But when you go too far the output tube stability suffers. A grid choke can be ideal as it has a low DCR to stabilize the output tube's grid but a high Z to perserve the gain of the driver tube. But 8 (or even 4) grid chokes would set you back a lot plus the coupling caps would need to be larger to avoid too high of a resonance point and that would also add cost. That said I run grid chokes and like the way they sound.
Russ
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Follow Ups
- Re: Grid leak R in PP output stage - Russ57 11:09:50 01/25/07 (13)
- Re: Grid leak R in PP output stage - zobsky 21:02:04 01/25/07 (3)
- Yes but.... - Russ57 05:40:21 01/26/07 (2)
- Re: Yes but.... - zobsky 08:00:45 01/26/07 (1)
- Re: Yes but.... - Russ57 10:24:38 01/26/07 (0)
- Re: Grid leak R in PP output stage - Uncle Clyde 12:25:39 01/25/07 (8)
- Re: Grid leak R in PP output stage - Pär 06:40:50 01/26/07 (6)
- Re: Grid leak R in PP output stage - dave slagle 09:24:27 01/26/07 (5)
- Please, a brief description of the concept - Uncle Clyde 06:29:22 01/29/07 (3)
- Re: Please, a brief description of the concept - dave slagle 11:25:38 01/29/07 (2)
- Re: Please, a brief description of the concept - Pär 12:22:46 01/31/07 (0)
- WAY COOL!!!!! - Uncle Clyde 04:53:04 01/30/07 (0)
- Re: Grid leak R in PP output stage - dave slagle 11:22:39 01/26/07 (0)
- Those chokes - Russ57 14:30:17 01/25/07 (0)
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