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Total 34 documents matching your query.

21. [Amps] 1993 Vintage 3-500z (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Tue, 6 Jun 2017 09:39:08 -0700
Not necessarily, but you need to bring them up carefully. If you have or can get access to a hi-pot tester, that might be the best first step. However, if it were mine: 1. Remove one of the tubes so
/archives//html/Amps/2017-06/msg00088.html (9,786 bytes)

22. Re: [Amps] Ten-Tec Titan 10 Meter Input SWR (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Sun, 11 Jun 2017 18:03:35 -0700
Original post segment: a practical matter, the input R+j of an amplifier >varies with drive level and usual test equipment will not provide useful data. If you drive it with a transmitter there is no
/archives//html/Amps/2017-06/msg00178.html (8,922 bytes)

23. Re: [Amps] Amps Digest, Vol 177, Issue 5 (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Mon, 4 Sep 2017 16:30:16 -0700
When you say direct to the circuit breaker, what are you bypassing? If it is the High Voltage on/off switch, I'd suspect arcing contacts there. It doesn't take much there with the inductance of that
/archives//html/Amps/2017-09/msg00017.html (7,005 bytes)

24. Re: [Amps] SB200 on 30 M (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Fri, 6 Oct 2017 08:35:09 -0700
I don't know the rules in Canada, but 30 meters is a shared allocation and in the U.S. the power limit is 200 watts PEP. 300 watts on 30 meters is illegal in the U.S. Check your local regulations. Ch
/archives//html/Amps/2017-10/msg00076.html (7,945 bytes)

25. Re: [Amps] SB200 on 30 m (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Fri, 6 Oct 2017 09:17:52 -0700
§97.313 Transmitter power standards. ...... (c) No station may transmit with a transmitter power output exceeding 200 W PEP: (1) On the 10.10-10.15 MHz segment; .... --Original Message-- From: Amps
/archives//html/Amps/2017-10/msg00080.html (9,260 bytes)

26. Re: [Amps] Plate Choke Issue (AJ) (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Wed, 3 Jan 2018 10:26:38 -0800
First thing to do is a careful inspection of all components: parasitic suppressor (Z1-Z4) resistors for signs of overheating (cracks and discoloration), coupling capacitors, and band switch contacts
/archives//html/Amps/2018-01/msg00030.html (9,465 bytes)

27. Re: [Amps] 8877 negative grid current (MU 4CX250B) (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Mon, 16 Jul 2018 14:26:59 +0000
I read somewhere that this can happen in a tube with a lot of hours and possibly some abuse. Over time, the grid can pick up contaminants from the cathode, which may let the grid get warm and start a
/archives//html/Amps/2018-07/msg00048.html (8,710 bytes)

28. Re: [Amps] RX Protection (score: 1)
Author: "Chris Hays" <chris@chrishays.com>
Date: Thu, 13 Sep 2018 17:11:36 +0000
Send Amps mailing list submissions to amps@contesting.com To subscribe or unsubscribe via the World Wide Web, visit http://lists.contesting.com/mailman/listinfo/amps or, via email, send a message wi
/archives//html/Amps/2018-09/msg00013.html (9,792 bytes)

29. [Amps] SB 220 tick tick tick (score: 1)
Author: Chris <chris@chrishays.com>
Date: Mon, 21 Jan 2019 18:18:36 +0000
I really hope this isn't the problem, but many years ago I heard something like this. Interestingly, this only happened when the DX-40 was in standby (HV center tap open). I never could figure it out
/archives//html/Amps/2019-01/msg00098.html (8,600 bytes)

30. Re: [Amps] ECONCO (score: 1)
Author: Chris <chris@chrishays.com>
Date: Thu, 30 Jan 2020 17:16:20 +0000
It has been many years now, but back when I was maintaining a Continental 317C-2 50kw AM transmitter, I had many 3CX3000A7 tubes rebuilt by ECONCO,and they actually lasted and performed better than t
/archives//html/Amps/2020-01/msg00053.html (7,524 bytes)

31. Re: [Amps] Amps Digest, Vol 213, Issue 2 (score: 1)
Author: Chris <chris@chrishays.com>
Date: Tue, 08 Sep 2020 17:12:33 +0000
Brand? Vintage? Where purchased? Not all 572B's are created equal. Chris AB6QK -- Message: 1 Date: Tue, 8 Sep 2020 11:43:21 -0400 From: "Ken, W8EK" <kenw8ek@gmail.com> To: Amps List <amps@contesting.
/archives//html/Amps/2020-09/msg00002.html (8,163 bytes)

32. [Amps] Re: History of Grounded Grid Amplfiers (score: 1)
Author: Chris <chris@chrishays.com>
Date: Sun, 13 Dec 2020 17:33:20 +0000
I suspect there aren't too many FM broadcasters opting for the indirect method these days, relying instead on the power output metering of the manufacturer.  I'm not  sure if the requirement for cali
/archives//html/Amps/2020-12/msg00015.html (14,234 bytes)

33. Re: [Amps] Amps Digest, Vol 229, Issue 20 (score: 1)
Author: "chris@chrishays.com" <chris@chrishays.com>
Date: Sun, 23 Jan 2022 17:51:34 +0000
Send Amps mailing list submissions to amps@contesting.com To subscribe or unsubscribe via the World Wide Web, visit http://lists.contesting.com/mailman/listinfo/amps or, via email, send a message wi
/archives//html/Amps/2022-01/msg00067.html (9,266 bytes)

34. Re: [Amps] Amps Digest, Vol 229, Issue 20 (score: 1)
Author: "chris@chrishays.com" <chris@chrishays.com>
Date: Sun, 23 Jan 2022 17:57:37 +0000
What I have read is that when RF Parts was working to get good quality 572Bs from China, many batches were returned to China, and it is thought that these wound up on EBAY and other sites dirt cheap.
/archives//html/Amps/2022-01/msg00068.html (9,875 bytes)

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