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1. [Amps] 8560A tube failures and tube reconditioning (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Sun, 09 May 2010 10:20:08 -0400
Sorry for the "QRP" amps question! (driver stage... :-) I think I know what is going on here, but would appreciate comments. I have a small VHF amp employing an 8560A tube. I have a box of used and N
/archives//html/Amps/2010-05/msg00115.html (8,321 bytes)

2. Re: [Amps] vacuum relay problem (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Sun, 29 Aug 2010 05:53:10 -0400
Are you sure the relay is not being "hot switched" ? I use RJ1 relays in two of my amps, with RG-142B/U connected directly to the relay terminals. Both amps have many hours with no relay failures and
/archives//html/Amps/2010-08/msg00434.html (7,734 bytes)

3. Re: [Amps] vacuum relay problem (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Sun, 29 Aug 2010 06:17:42 -0400
Hi again Felipe, If it lasted that long the first time, it probably is not a hot switching issue... I guess. :) The way I check for that is with a dual channel scope. One channel looks at RF from the
/archives//html/Amps/2010-08/msg00436.html (8,405 bytes)

4. Re: [Amps] reading and tuning (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Mon, 20 Sep 2010 06:20:12 -0400
And some (FT-2000 for example) have a jack that can be wired to an external switch specifically for the purpose of providing a carrier regardless of mode. This is separate from the CW key jack. I fin
/archives//html/Amps/2010-09/msg00230.html (7,922 bytes)

5. [Amps] Which LDG Autotuner for Amp Input? (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Sat, 09 Oct 2010 07:24:34 -0400
This isn't in any of the Handbooks I happen to own. I tried looking on LDG's web site but found no autotuner without a box. Maybe it is a special order item? Does anyone have more info on this? I am
/archives//html/Amps/2010-10/msg00138.html (8,452 bytes)

6. Re: [Amps] Which LDG Autotuner for Amp Input? (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Sun, 10 Oct 2010 08:09:14 -0400
Thanks everyone for the replies and information! It seems I didn't look closely enough at the discontinued products. The W4RT AT-100PRO with AT-100AMP CPU looks attractive. It won't fit in the box (n
/archives//html/Amps/2010-10/msg00152.html (8,851 bytes)

7. Re: [Amps] TUNER (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Mon, 11 Oct 2010 02:42:35 -0400
That works fine except I have a habit of using it with a couple of "not quite perfect" antennas when operating barefoot, which messes up its band memories for the amp input. Then I forget to push the
/archives//html/Amps/2010-10/msg00170.html (7,393 bytes)

8. Re: [Amps] TUNER (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Tue, 12 Oct 2010 07:04:31 -0400
Just to clarify what I was thinking *if* I go the auto tuner route... I would put it between the amp input relay and the tube. Easy in my case since the amp has a relay box mounted on the back with c
/archives//html/Amps/2010-10/msg00189.html (8,591 bytes)

9. Re: [Amps] 2010 Handbook (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Wed, 17 Nov 2010 06:18:39 -0500
I once built a successful 160-10m amp around a 4CX1000A with no socket at all. OK, it took 10 minutes to change out the tube, but you rarely if ever have to replace one. I ran a single 4CX1000A at le
/archives//html/Amps/2010-11/msg00295.html (8,448 bytes)

10. Re: [Amps] 2010 Handbook (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Wed, 17 Nov 2010 08:35:34 -0500
That's true Gerald. :-) The 1/2 inch wide brass "U" clips on the grid, cathode, and filament were quick enough, but the 6 screws for the clamp plates to hold the tube in place (by means of clamping i
/archives//html/Amps/2010-11/msg00300.html (10,488 bytes)

11. Re: [Amps] 2010 Handbook (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Wed, 17 Nov 2010 19:28:40 -0500
The band switching scheme never arced and worked fine except for being a little confusing at 0200 local time! As I recall it was A (tune) and A (load) for 40, A+B and B for 80, A+B+C and A+C for 160.
/archives//html/Amps/2010-11/msg00322.html (8,594 bytes)

12. Re: [Amps] Tube Amps as Antenna Tuners (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Wed, 26 Jan 2011 17:33:59 -0500
My amp and ATU are one and the same. I have got away with using 160, 80, and 40 meter antennas on 17 and 12 meters, as well as some other "radical" things. OTOH, my amp is homebrew and built to be ab
/archives//html/Amps/2011-01/msg00334.html (7,918 bytes)

13. Re: [Amps] DIN vs N (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Mon, 25 Apr 2011 18:41:56 -0400
My personal preference is LMR600UF. Paul N1BUG _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2011-04/msg00526.html (8,822 bytes)

14. Re: [Amps] 4-400A ratings (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Mon, 09 May 2011 11:43:21 -0400
difference on 160 meters. It depends on what you do on 160 meters. If I could find a way to get another 1.4 dB on that band, I'd be doing it! But I consider myself an "extreme" weak signal DXer. Aft
/archives//html/Amps/2011-05/msg00016.html (7,516 bytes)

15. Re: [Amps] Teflon Chimneys (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Sat, 14 May 2011 10:14:08 -0400
Oops, sorry... forgot to change address on reply... below is how I make my teflon chimneys. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti
/archives//html/Amps/2011-05/msg00101.html (8,469 bytes)

16. Re: [Amps] arrrrgggg!! (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Mon, 23 May 2011 19:14:28 -0400
Yes, and it was tuned with a vacuum variable. The output coupling was a flapper. I often regretted parting with that amp, as it was in many respects better than what succeeded it. 73, Paul N1BUG ___
/archives//html/Amps/2011-05/msg00204.html (7,511 bytes)

17. Re: [Amps] HIGHWAY LOUIE (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Tue, 22 Nov 2011 08:02:14 -0500
His QRZ.com listing says there is a generator and has a brief description of the setup. It doesn't mention antennas, though. Paul _______________________________________________ Amps mailing list Amp
/archives//html/Amps/2011-11/msg00105.html (8,205 bytes)

18. Re: [Amps] HV feed through capacitor (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Fri, 10 Feb 2012 15:16:30 -0500
RF Parts has a 6 KV 680 pF for about $10 that I have used with success. My HV is only 4.2 kV however. 73, Paul N1BUG _______________________________________________ Amps mailing list Amps@contesting.
/archives//html/Amps/2012-02/msg00091.html (7,637 bytes)

19. [Amps] instability issue (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Wed, 27 Mar 2013 07:12:48 -0400
I'm trying to understand a problem with one of my amps. It is homebrew, 160-10 meters, using a 4CX1500B with screen grounded, grid RF grounded, cathode drive. It uses a conventional tapped coil pi ne
/archives//html/Amps/2013-03/msg00339.html (8,576 bytes)

20. Re: [Amps] instability issue (score: 1)
Author: N1BUG <paul@n1bug.com>
Date: Wed, 27 Mar 2013 08:26:52 -0400
Wow! Further to this... my frequency counter seems to believe the oscillation is occurring at ~400 to ~450 kHz! The frequency does shift substantially as I adjust the load cap, and to a much lesser d
/archives//html/Amps/2013-03/msg00342.html (8,948 bytes)

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