All you need at the grid is R3

Posted by Tre' (P) on August 26, 2024 at 15:34:53

In Reply to: strange phono stage posted by horny on August 25, 2024 at 11:37:15:

C9 only needs to be big enough for the high pass filter's -3db point to be 2Hz (if you want 20Hz untouched by the filter). So the value necessary will depend on the input impedance of whatever you are driving with that preamp.

If that load is 100K then .8uf will do.

C5 could be .15uf and pass 20Hz perfectly.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

https://www.digikey.com/en/resources/conversion-calculators/ (Open in New Window)

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Follow Ups Full Thread

Topic - strange phono stage - horny 11:37:15 08/25/24 (16)

All you need at the grid is R3 - Tre' 15:34:53 08/26/24 (0)

RE: strange phono stage - Best audiotransformers 12:08:20 08/25/24 (14)

RE: strange phono stage - horny 14:46:34 08/25/24 (13)

RE: strange phono stage - Best audiotransformers 03:03:34 08/26/24 (0)

DC won't got through a transformer. nt - Tre' 15:12:14 08/25/24 (11)

RE: DC won't got through a transformer. nt - horny 22:36:24 08/25/24 (10)

"Tre i have no transformer in the phono stage" - Tre' 15:26:52 08/26/24 (9)

RE: "Tre i have no transformer in the phono stage" - horny 10:00:21 08/27/24 (8)

RE: "Tre i have no transformer in the phono stage" - Tre' 19:49:04 08/27/24 (6)

RE: "Tre i have no transformer in the phono stage" - horny 11:10:08 08/28/24 (5)

RE: "Tre i have no transformer in the phono stage" - Best audiotransformers 14:22:48 08/28/24 (4)

RE: "Tre i have no transformer in the phono stage" - Tre' 16:35:25 08/29/24 (3)

RE: "Tre i have no transformer in the phono stage" - Best audiotransformers 12:22:12 08/30/24 (2)

RE: "Tre i have no transformer in the phono stage" - Tre' 13:27:26 08/30/24 (1)

RE: "Tre i have no transformer in the phono stage" - Best audiotransformers 11:01:53 09/01/24 (0)

RE: "Tre i have no transformer in the phono stage" - Best audiotransformers 14:02:47 08/27/24 (0)

Follow Ups

All you need at the grid is R3 - Tre' 15:34:53 08/26/24 (0)

All you need at the grid is R3

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