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Total 8 documents matching your query.

1. [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Sun, 14 Mar 1999 20:11:51 -0500; Hi folks. Here's a problem I've encountered with amateur radio's most complex amp. Hopefully, I can resolve this tomorrow with some nominal test voltages from Alpha Power, but I thought perhaps the e; /archives//html/Amps/1999-03/msg00292.html (16,668 bytes)
2. [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 14 Mar 1999 22:48:33 -0800; ? A given with solid-state transceivers driving a g-g amp. . ? A very real possibility with 3CX800s. I would use a high-pot. (the tube should be upright during testing) with pos. on the anode and ne; /archives//html/Amps/1999-03/msg00298.html (14,977 bytes)
3. [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Mon, 15 Mar 1999 10:32:18 -0500; ? With 33v of cutoff bias, anode-current in healthy tubes should probably be under 50uA. My guess is that there is a leakage problem with both tubes. To find out for sure, a high-pot test is the best; /archives//html/Amps/1999-03/msg00311.html (9,659 bytes)
4. [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 15 Mar 1999 09:38:46 -0800; ? This is not normal. If I did not have a high-pot., I would remove the tube, connect a 1k ohm resistor (shunted by 1N5400-series glitch protection diodes) in series with the hv neg. return which I; /archives//html/Amps/1999-03/msg00315.html (10,808 bytes)
5. FW: [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 15 Mar 1999 11:57:38 -0700; Hi Dick... You're absolutely right - when HV is physically disconnected from both tubes' anodes, it's just really improbable that those mystical little gold balls we so often hear about -- the ones t; /archives//html/Amps/1999-03/msg00318.html (9,788 bytes)
6. FW: [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 15 Mar 1999 14:16:04 -0800; ? Mystical gold balls? According to the 'Eimac letter' on my Web site, evaporated gold, which is caused by an oscillation condition, poisons emission and causes leakage. (photographs of gold-sputter; /archives//html/Amps/1999-03/msg00320.html (9,788 bytes)
7. FW: [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Mon, 15 Mar 1999 17:32:26 -0500; On Mon, 15 Mar 1999 11:57:38 -0700 "Richard W. Ehrhorn" <w4eto@rmii.com> writes: God, I'm glad you responded Dick. I was getting a bit frustrated with the comments from outer space and maybe even bey; /archives//html/Amps/1999-03/msg00326.html (12,005 bytes)
8. [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Mon, 15 Mar 1999 19:19:08 -0500; I spoke with Carl at the factory today and he's in agreement that the most likely culprit is the op amp. As soon as he has an 87A available he's going to take some measurements around the op amp so; /archives//html/Amps/1999-03/msg00328.html (9,234 bytes)

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