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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: Thank you! And cap questions? posted by immatthewj on July 25, 2020 at 22:03:52:
While "film" capacitor life is practically infinite, "electrolytic" caps have an average lifespan of 20 years. But like "best before dates on food products", it really is just a recommended guideline. Some caps will age while in use. Others can actually age faster because they are not in use.
Firstly, with your DVM in "resistance" mode, your cap should not show any resistance value but climb to infinity. If it holds steady at a resistance value, the cap is "shorted", or bad.
In capacitance mode, your DVM may have an auto range value detector, or has to be selected manually. With the capacitors you have, you want it to be set to/or allow auto range upto 1000uf.
If your current DVM does not go that high, look at what Lowes has online. Capacitance range might be in the online description, or you might have to Google and download the manual to check. (Reminder, if your DVM in hand is supposed to go that high, check the DVM fuses. Often there are two different values and one may have blown.)
If you don't have any luck at Lowes, there is a capacitor value meter and capacitor ESR meter sold as a set on Amazon. Cost next to nothing, (and it shows in the way they are built and the probes are practically useless.) But for as often as I use them, they are fine.
Do try swapping out the EL84 current source and 6922 on the big Cary. Even though biasing is not required, a bad tube may cause the problem in that channel.
Also, if/when you get a chance, can you upload some pics of the underside of the big Cary with the bottom off? I cannot find anything decent on the net. Would be great to see what's going on in there.
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: 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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