Search String: Display: Description: Sort:

Results:

References: [ +from:k6ll.dave@gmail.com: 18 ]

Total 18 documents matching your query.

1. Re: [Amps] premade HV rectifier board (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Thu, 4 Jul 2013 15:25:12 -0700
A friend of mine blew one of the filter capacitors in his AL-1500. As I remember, the entire filter capacitor board, with capacitors and resistors installed, was very reasonably priced. ($180?) I sus
/archives//html/Amps/2013-07/msg00009.html (8,348 bytes)

2. [Amps] Tune cap at minimum (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Thu, 3 Oct 2013 10:17:33 -0700
I have an amplifier that tunes up on 21 MHz with the tune capacitor at minimum value. It acts like the capacitance should be even lower for max efficiency and output on 21 MHz. All of the other bands
/archives//html/Amps/2013-10/msg00013.html (7,555 bytes)

3. Re: [Amps] Tune cap at minimum - solved (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Sat, 5 Oct 2013 15:56:50 -0700
Thanks to all who provided suggestions. As recommended, I slightly spread out the turns on the 21 MHz inductor, and now the amp tunes up perfectly, with the tune cap about 10% meshed. Thanks again! D
/archives//html/Amps/2013-10/msg00059.html (7,739 bytes)

4. Re: [Amps] Alpha likes to remain on (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Tue, 22 Oct 2013 10:07:52 -0700
Speaking of cleaning relay contacts, I bought one of these a few weeks ago: http://www.ebay.com/itm/Neuses-3-316-relay-contactor-switch-contact-cleaning-burnisher-burnishing-tool-/331031734259?ssPage
/archives//html/Amps/2013-10/msg00400.html (7,991 bytes)

5. Re: [Amps] AL-1200 T/R problem (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Fri, 31 Jan 2014 10:28:26 -0700
Sounds like oxidation of the normally-closed contacts of the T/R relay. Remove or slice open the plastic cover and use one of these: http://www.ebay.com/itm/Neuses-3-316-relay-contactor-switch-contac
/archives//html/Amps/2014-01/msg00340.html (9,241 bytes)

6. Re: [Amps] Worst Tube Socket Ever (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Sun, 9 Mar 2014 12:31:21 -0700
The process you describe is the only way I've been able to do it. I agree that it is a PITA. Hopefully, it does not have to be done very often. Dave Hachadorian, K6LL Yuma, AZ Does anyone have any ti
/archives//html/Amps/2014-03/msg00033.html (8,908 bytes)

7. Re: [Amps] AL-1200 Tuning Capacitor Range (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Fri, 17 Oct 2014 22:05:23 -0700
Reduce the inductance. This is usually most easily done by spreading out the turns on the 21 MHz coil. Dave Hachadorian, K6LL Yuma, AZ I have an AL-1200 that works very well using the 3CX1200A7 tube,
/archives//html/Amps/2014-10/msg00154.html (8,336 bytes)

8. [Amps] AL-1500 power relays (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Sun, 1 Feb 2015 16:16:03 -0700
I used my AL-1500 in the Sprint Contest on Saturday night, and everything worked fine. This morning, I was puttering around the shack, and heard a humming noise. Come to find out, the AL-1500 was sit
/archives//html/Amps/2015-02/msg00001.html (7,463 bytes)

9. [Amps] AL-1500 power relays - update (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Mon, 2 Feb 2015 17:51:18 -0700
Thanks for the replies on my original message below. I checked out the AL-1500 today, and it is wired according to the schematic, so that was not the problem. I found the contacts of the single pole
/archives//html/Amps/2015-02/msg00015.html (8,513 bytes)

10. Re: [Amps] SPE 2K RTTY Duty Cycle (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Fri, 22 May 2015 06:52:58 -0700
ARRL product review of the Yaesu FT-990 in November, 1991 QST showed IM3 at -38 dB. I always remember that number, and wonder why modern 12 volt rigs can't equal it. Dave Hachadorian, K6LL Yuma, AZ T
/archives//html/Amps/2015-05/msg00148.html (10,508 bytes)

11. Re: [Amps] Triode grounded grid amp strange failure (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Tue, 14 Jul 2015 17:21:26 -0700
This type of thing can happen if B- and ground are tied together. There should be a beefy diode between B- and ground. Sometimes this diode can short if there is a high current glitch event. Also, th
/archives//html/Amps/2015-07/msg00044.html (8,489 bytes)

12. [Amps] Rough note on 160 (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Wed, 2 Dec 2015 15:11:45 -0700
I have an AL-1500 that has a rough note on 160. It also has a rough note on the other bands when I drive it with QRP, getting about 150 watts out. Otherwise, running 1500 watts output on 10 through 8
/archives//html/Amps/2015-12/msg00010.html (7,159 bytes)

13. Re: [Amps] New Amplifier (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Sun, 9 Apr 2017 13:44:23 -0700
For the SO2R crowd, this one amp takes the place of two, which makes the economics look a lot better. Also, it is no-tune, remotely controllable, and has 6 Meter coverage. Dave Hachadorian, K6LL Yuma
/archives//html/Amps/2017-04/msg00027.html (9,072 bytes)

14. Re: [Amps] SB220 step start blows fuses - c'mon (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Mon, 10 Jul 2017 13:02:31 -0700
C'mon guys, this is only an SB-220. It's a barebones amplifier with no complicated protective circuits. It's easy to work on, since it was built as a kit. To troubleshoot this amp, you should need on
/archives//html/Amps/2017-07/msg00051.html (17,706 bytes)

15. Re: [Amps] Amp Supply LK-500 metering (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Wed, 14 Feb 2018 08:17:44 -0700
Does this amp have a diode between B- and ground? If so, and that diode shorts, the metering gets messed up. Dave Hachadorian, K6LL Yuma, AZ I am working on an amp supply lk-500 that has a strange me
/archives//html/Amps/2018-02/msg00023.html (9,024 bytes)

16. Re: [Amps] Need some amplifier advice (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Tue, 25 Jun 2019 08:36:17 -0700
I used to have an amp like this. It was (4) 572B's in GG, with a pair of 3B28 rectifier tubes in FWCT. I still have the power transformer and choke from this amp, and can send them to you for the pri
/archives//html/Amps/2019-06/msg00061.html (9,237 bytes)

17. Re: [Amps] Are Amps Slow on the uptake? Or is it just me? (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Sat, 29 Jun 2019 09:56:22 -0700
You say that the first few letters of a call sign are weaker. That's a long period of time, and amplifiers are not that slow. You also imply that this happens on a regular basis. I operate in contest
/archives//html/Amps/2019-06/msg00076.html (9,911 bytes)

18. Re: [Amps] Henry 2K desktop amp (score: 1)
Author: "Dave Hachadorian" <k6ll.dave@gmail.com>
Date: Sat, 29 Jun 2019 10:04:38 -0700
I have an SB-220 that developed a high resistance between the tube socket and the filament pins. I would pull the dark tube, inspect the filament pins to make sure they haven't overheated to the exte
/archives//html/Amps/2019-06/msg00079.html (9,645 bytes)

Current List: 1 - 18
Page: [1]
This search system is powered by Namazu