In Reply to: RE:Actually, i had a circuit problem. But, your suggestion is good posted by DAK on January 7, 2017 at 14:39:33:
If your circuit uses fixed bias why do you have a cathode resistor.
With the grid resistor feed by a negative bias supply the cathode should just be grounded.
BTW I read your other post and if you are going to use a LED in the cathode for cathode biasing you still need a proper amount of plate current and a proper amount of plate voltage.
You want to operate the tube somewhere that the tube is linear.
A 6sn7 with only 60 volts on the plate and only 2ma. (or so) is not a linear place.
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I like 12-14ma 200 volts on the plate but that operating point is out of the question it you use a plate resistor.
I use a CCS plate load.
It makes everything easier and makes for a very linear stage with a lot of plate voltage swing (if you need a lot of swing, like in a driver stage).
Tre'
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Follow Ups
- RE:Actually, i had a circuit problem. But, your suggestion is good - Tre' 18:52:17 01/07/17 (10)
- I'm open to suggestions and a CCS would be something i'd like to try - DAK 19:47:44 01/07/17 (9)
- RE: I'm open to suggestions and a CCS would be something i'd like to try - Tre' 08:08:07 01/08/17 (8)
- RE:I changed the plate resistor between posts - DAK 08:38:55 01/08/17 (7)
- RE:I changed the plate resistor between posts - Tre' 17:33:29 01/08/17 (6)
- RE:I changed the plate resistor between posts - DAK 19:57:30 01/08/17 (5)
- RE:I changed the plate resistor between posts - Tre' 09:41:04 01/09/17 (4)
- Do you know someone who makes one that i can buy? - DAK 09:56:01 01/09/17 (3)
- RE: Do you know someone who makes one that i can buy? - Tre' 14:54:26 01/09/17 (2)
- RE: Do you know someone who makes one that i can buy? - DAK 15:27:19 01/09/17 (1)
- RE: Do you know someone who makes one that i can buy? - Tre' 16:20:12 01/09/17 (0)