In Reply to: I'm open to suggestions and a CCS would be something i'd like to try posted by DAK on January 7, 2017 at 19:47:44:
Something is not adding up here.
If you look at the plate curves for a 7a4 at the spot where 115 volts plate and -3 volts bias intersect. That shows about 4.5ma. plate current.
4.5ma of current across 80k ohms will drop 360 volts.
To end up with 115 volts at the plate you would have to start with a 475 volt supply feeding the top of the plate resistor.
As for CCS......DN2540 are cheap. $1.42 each at Mouser.
Check the link below.
Tre'
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"Still Working the Problem"
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Follow Ups
- 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)