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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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HiI have made a modified version of this amplifier, difference being a parafeed output stage using Sowter plate chokes and parafeed output transformers. I have just replaced the 220K grid leak resistors on the 2A3's with a pair of 640H grid chokes (640H, 20.5K DCR & 60pF internal C).
I don't know how I should I calculate the coupling cap value which is currently 0.22uF, if I aim for a F of 5Hz lower value, normally (for a grid leak resistor) the formula would be 1/(2*pi*F*R), this obviously is incorrect for a grid choke with a DCR of 20.5K. Can anyone help me with a cap value here?
Thanks
Martin
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Topic - Grid choke and optimum coupling cap value - Deco-Doctor 02:07:04 07/02/06 (35)
- I just went through all of this - Russ57 06:06:28 07/02/06 (14)
- Re: I just went through all of this - Deco-Doctor 06:38:01 07/02/06 (13)
- For a cheap cap to try out - Russ57 08:02:28 07/02/06 (8)
- Re: For a cheap cap to try out - Deco-Doctor 09:27:13 07/02/06 (3)
- Why not? - Russ57 10:20:23 07/02/06 (2)
- Re: Why not? - Paul Barker 12:19:15 07/02/06 (1)
- A comment about grid current - Russ57 16:37:32 07/03/06 (0)
- Re: For a cheap cap to try out - Deco-Doctor 08:38:46 07/02/06 (3)
- Re: For a cheap cap to try out - mqracing 08:42:23 07/02/06 (2)
- Re: For a cheap cap to try out - Deco-Doctor 10:02:14 07/02/06 (1)
- Re: For a cheap cap to try out - mqracing 10:05:16 07/02/06 (0)
- Re: I just went through all of this - Paul Barker 08:00:07 07/02/06 (3)
- Re: I just went through all of this - mqracing 08:25:52 07/02/06 (1)
- Re: I just went through all of this - Paul Barker 08:46:16 07/02/06 (0)
- Re: I just went through all of this - Paul Barker 08:01:55 07/02/06 (0)
- Re: Grid choke and optimum coupling cap value - dave slagle 04:50:34 07/02/06 (11)
- Re: Grid choke and optimum coupling cap value - Deco-Doctor 04:55:49 07/02/06 (10)
- Re: Grid choke and optimum coupling cap value - dave slagle 08:10:31 07/02/06 (5)
- Re: Grid choke and optimum coupling cap value - Deco-Doctor 08:50:59 07/02/06 (4)
- Re: Grid choke and optimum coupling cap value - dave slagle 13:56:20 07/02/06 (3)
- Re: Grid choke and optimum coupling cap value - dave slagle 19:55:10 07/02/06 (2)
- LT Spice - Deco-Doctor 23:44:22 07/02/06 (1)
- OK I found the file. - Deco-Doctor 23:52:39 07/02/06 (0)
- Hmm, I would not go that high - Nickel Core 06:04:06 07/02/06 (3)
- Re: Hmm, I would not go that high - dave slagle 08:32:11 07/02/06 (0)
- Re: Hmm, I would not go that high - Paul Barker 07:55:36 07/02/06 (1)
- Re: Hmm, I would not go that high - mqracing 08:15:42 07/02/06 (0)
- Re: Grid choke and optimum coupling cap value - Thorsten 04:22:58 07/02/06 (2)
- Re: Grid choke and optimum coupling cap value - Deco-Doctor 04:42:06 07/02/06 (1)
- Re: Grid choke and optimum coupling cap value - Thorsten 07:55:24 07/02/06 (0)
- Re: Grid choke and optimum coupling cap value - Paul Barker 03:50:55 07/02/06 (4)
- Re: Grid choke and optimum coupling cap value - Paul Barker 03:54:59 07/02/06 (3)
- Re: Grid choke and optimum coupling cap value - Deco-Doctor 04:24:11 07/02/06 (0)
- Re: Grid choke and optimum coupling cap value - Paul Barker 03:56:18 07/02/06 (1)
- Thanks Paul..... - Deco-Doctor 04:14:09 07/02/06 (0)
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