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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: my bias is running away on one side even with the bias backed all the way off on that side! posted by immatthewj on July 23, 2020 at 11:07:59:
I'm no technician either but have managed many repairs with resources available here and personal experiences.
Remember to do testing with power off and ideally discharged overnight.
You are correct in saying the capacitor reading that is off may not be the issue. Unless your meter can do an "in circuit" measurement, as well as doing an ESR reading.
Easy work around though. Just unsolder one of the leads of the "bad?" capacitor and test it again. If the reading is now in line with the others, it is not the capacitor, but something else sharing the circuit.
You may as well also check any resistors in the vicinity. OK to do in circuit.
Beyond that, other than checking for bad solder joints, you might have to trouble shoot with a schematic in hand. And that could mean measuring voltages while the unit is on. Only work on a powered unit if you are comfortable with it. Hopefully someone more qualified can chime in and zero in on other things to check.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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Follow Ups
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - Jonesy 13:10:22 07/23/20 (32)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - immatthewj 14:35:10 07/23/20 (31)
- Cary Customer Support - AbeCollins 06:51:56 07/28/20 (1)
- RE: Cary Customer Support - immatthewj 11:45:26 07/28/20 (0)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - Jonesy 17:32:42 07/23/20 (28)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - immatthewj 23:48:12 07/23/20 (27)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - Jonesy 05:46:38 07/24/20 (26)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - immatthewj 10:35:27 07/24/20 (25)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - Jonesy 11:03:04 07/24/20 (24)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - immatthewj 11:27:56 07/24/20 (23)
- RE: my bias is running away on one side even with the bias backed all the way off on that side! - Jonesy 17:04:11 07/24/20 (22)
- Thank you! And cap questions? - immatthewj 22:03:52 07/25/20 (21)
- RE: Thank you! And cap questions? - Jonesy 23:42:26 07/25/20 (20)
- RE: Thank you! And cap questions? - immatthewj 17:12:33 07/26/20 (19)
- RE: Thank you! And cap questions? - immatthewj 17:24:29 07/26/20 (18)
- RE: Thank you! And cap questions? - immatthewj 17:44:30 07/26/20 (17)
- RE: Thank you! And cap questions? - Jonesy 18:53:48 07/26/20 (16)
- RE: Thank you! And cap questions? - immatthewj 11:04:37 07/27/20 (15)
- RE: Thank you! And cap questions? - Jonesy 11:44:28 07/27/20 (14)
- RE: Thank you! And cap questions? - immatthewj 14:24:26 07/27/20 (13)
- RE: Thank you! And cap questions? - Jonesy 09:33:47 07/28/20 (11)
- RE: Thank you! And cap questions? - immatthewj 11:48:52 07/28/20 (10)
- ... also a reminder bias is set with no signal. It goes up and down once signal applied. (nt) - Jonesy 15:01:40 07/28/20 (8)
- RE: ... also a reminder bias is set with no signal. It goes up and down once signal applied. (nt) - immatthewj 20:25:26 07/28/20 (7)
- RE: ... also a reminder bias is set with no signal. It goes up and down once signal applied. (nt) - Jonesy 21:27:18 07/28/20 (6)
- RE: ... also a reminder bias is set with no signal. It goes up and down once signal applied. (nt) - immatthewj 12:50:31 07/29/20 (5)
- Economic "in circuit" capacitor meter - Jonesy 14:50:59 07/29/20 (4)
- RE: Economic "in circuit" capacitor meter - immatthewj 14:59:45 07/29/20 (3)
- RE: Economic "in circuit" capacitor meter - Jonesy 15:11:12 07/29/20 (2)
- RE: Economic "in circuit" capacitor meter - immatthewj 15:24:56 07/29/20 (1)
- RE: Economic "in circuit" capacitor meter - immatthewj 16:26:12 08/05/20 (0)
- RE: Thank you! And cap questions? - Jonesy 14:44:08 07/28/20 (0)
- RE: Thank you! And cap questions? - Jonesy 14:54:19 07/27/20 (0)
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