In Reply to: Is there a secret to using the 7A4? posted by DAK on January 6, 2017 at 20:34:25:
With an 80k ohm plate resistor and only 300 volts supply you can't run much more than 2ma. or there will be no voltage left at the plate.Try a 2.7k ohm cathode resistor or keep your 360 ohm cathode resistor and replace the 80k plate resistor with a 22k.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 01/07/17 01/07/17
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Follow Ups
- RE: Is there a secret to using the 7A4? - Tre' 11:20:06 01/07/17 (13)
- If i use a Blue LED ? - DAK 15:05:15 01/07/17 (0)
- RE:Actually, i had a circuit problem. But, your suggestion is good - DAK 14:39:33 01/07/17 (11)
- 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)