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In Reply to: Audio Research VS110 problem posted by Bigjimsguitars on February 18, 2015 at 16:40:07:
There's a 90% chance that there is an open resistor in either the cathode of V5 or the screen grid of V5..Either of these resistors being open will cause the tube not to conduct and therefore not bias up.
It's very easy to check to see if the screen grid voltage is at pin 4 where it needs to be..Pull the tube out and measure the DC voltage at pin 4 with the meter's black lead going to the chassis..You just need to be over 400vdc.
The cathode resistor you check by doing what Tre said..Measure the resistance from pin 8 of V5 to ground.It should be 10 ohms or less depending on which value they used.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 02/18/15
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Follow Ups
- Lets simplify this for you real quick. - Michael Samra 21:51:08 02/18/15 (20)
- spot on advice! - Bigjimsguitars 09:47:34 02/19/15 (0)
- RE: Lets simplify this for you real quick. - Bigjimsguitars 04:49:43 02/19/15 (18)
- RE: Lets simplify this for you real quick. - Michael Samra 13:32:01 02/19/15 (17)
- Over my head - Bigjimsguitars 07:02:37 02/24/15 (16)
- RE: Over my head - Michael Samra 08:52:53 02/24/15 (0)
- RE: Over my head - Bigjimsguitars 07:37:25 02/24/15 (14)
- RE: Over my head - Tre' 13:26:15 02/24/15 (12)
- RE: Over my head - Bigjimsguitars 13:42:57 02/24/15 (11)
- RE: Over my head - Tre' 14:02:58 02/24/15 (10)
- RE: Over my head - Bigjimsguitars 14:38:57 02/24/15 (8)
- Doesn't sound bad at half power - Bigjimsguitars 16:03:44 02/24/15 (7)
- You're so close... - Tre' 18:23:50 02/24/15 (6)
- RE: You're so close... - Bigjimsguitars 18:35:06 02/24/15 (5)
- Let us know how it goes. (nt) - Tre' 19:25:07 02/24/15 (4)
- RE: Let us know how it goes. (nt) - Bigjimsguitars 09:10:00 02/25/15 (3)
- Congratulations Jim, it feels great to slay the dragon, doesn't it? (nt) - Tre' 12:15:28 02/25/15 (2)
- RE: Congratulations Jim, it feels great to slay the dragon, doesn't it? (nt) - Bigjimsguitars 14:06:25 02/25/15 (1)
- Cool (nt) - Tre' 14:29:31 02/25/15 (0)
- Done and here's the offender - Bigjimsguitars 14:12:25 02/24/15 (0)
- RE: Over my head - Bigjimsguitars 07:39:45 02/24/15 (0)