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1. Re: [Amps] Tube amps are not a thing of the past (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Mon, 5 Jun 2017 06:36:47 -0400; Tubes in High Power Amps can take a licking and keep on ticking...but not solid state amps devices. Replacing power MOSFETS in RF pallets is much more complicated. ___________________________________; /archives//html/Amps/2017-06/msg00035.html (7,619 bytes)
2. Re: [Amps] Glass Vs Ceramic (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Tue, 6 Jun 2017 12:32:49 -0400; Everything from Machelett went to China where power tubes are being manufactured under that same name. I recently price a 3CX1500A7 at 1/3rd the price of an Eimac version. K5SVC imports them and offe; /archives//html/Amps/2017-06/msg00087.html (7,496 bytes)
3. Re: [Amps] Solid State Amps-v- Tube Amps (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sun, 18 Jun 2017 22:13:54 -0400; One thing to consider is that most solid state amps have very sensitive VSWR protection circuits and will not produce the full output unless there is no reflected power power. I have found it necessa; /archives//html/Amps/2017-06/msg00225.html (8,119 bytes)
4. Re: [Amps] need QSK board for Alpha 78 (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sat, 8 Jul 2017 11:31:33 -0400; I have a QSK board for the Ameritron AL-1200 and 1500 w. instructions. It is new and never used. It is identified as a QSK-1 kit in the Ameritron catalog. Since I have both a 1200 and a 1500 I a goin; /archives//html/Amps/2017-07/msg00036.html (7,329 bytes)
5. Re: [Amps] Machlett 3-500z (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sun, 23 Jul 2017 07:08:54 -0400; K5SVC buys Machlett (Chinese) in larger quantities and offers a 1 year warranty. If you are looking to replace a 3CX1500A7 (AL-1500 Ameritron) the price is about 1/3rd what vendors charge for Eimac.; /archives//html/Amps/2017-07/msg00087.html (9,143 bytes)
6. Re: [Amps] Grid dip meters 2 models, opinions? (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Tue, 5 Sep 2017 07:36:15 -0400; The MFJ 259 works fine as a GDO with digital readout. All you need to construct a simple pickup coil. Herb, KV4FZ Regards Conrad So does anyone have any experience of the devices that I asked about?; /archives//html/Amps/2017-09/msg00022.html (10,826 bytes)
7. Re: [Amps] Alpha 87A Won't Key (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Wed, 22 Nov 2017 20:49:18 -0400; Frank, I had the same problem with my Alpha 87A and found a bad connection on the RCA plug. This can be resoldered by opening up the small plate on the bottom of the chassis just below the tube socke; /archives//html/Amps/2017-11/msg00190.html (8,942 bytes)
8. Re: [Amps] Removing Rocker Switch from Alpha 87A (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Fri, 8 Dec 2017 06:12:05 -0400; Frank, Until you get some help on this there is a shortcut by using the using the Alpha Remote GUI interface which gives full control on your computer of all the 87A front panel functions. I'm sure y; /archives//html/Amps/2017-12/msg00054.html (7,832 bytes)
9. Re: [Amps] Multi tube amp (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Wed, 6 Dec 2017 09:07:44 -0400; If you can get some metal 6L6's for a reasonable price at a flee market, you can turn the amp upside down and place it in a large pan of water and really run some power to a bunch of them. A true HB; /archives//html/Amps/2017-12/msg00071.html (35,721 bytes)
10. Re: [Amps] Alpha87a remoting over the internet (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sat, 23 Dec 2017 16:34:21 -0400; Dwight, I take a different and very successful approach here. I put the Alpha 87 GUI (Alpha's Remote) up on a computer screen and connect that screen via Teamviewer to my remote site. All the control; /archives//html/Amps/2017-12/msg00132.html (8,300 bytes)
11. [Amps] Solid State Amp Repairs (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sat, 10 Feb 2018 08:27:35 -0400; My THP 1.5K has some bad MOSFETs on the PA board. It appears that nobody in all of hamdom who repairs this amplifier. I have removed the PA section and hope through this post someone will know of any; /archives//html/Amps/2018-02/msg00010.html (6,967 bytes)
12. [Amps] Big HV Supply (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sun, 29 Jul 2018 17:21:05 -0300; I have a large brute 70 lb HV supply that came from an amateur QRO amplifier where what is inside is two big relays and no rectifiers. There are two cables. One for AC power and the other that takes; /archives//html/Amps/2018-08/msg00000.html (6,623 bytes)
13. [Amps] Ameritron Al-1500 excessived grid current & shut down (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sun, 26 Aug 2018 17:30:51 -0300; Today I turned on the Al-1500and immediately notice that the grid current went all the way over to the right and the amp grid protection circuit kick in. Even with only 5 watts of drive, the grid cur; /archives//html/Amps/2018-08/msg00049.html (7,113 bytes)
14. Re: [Amps] I'm looking for someone fix my Sb220 amp (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Thu, 6 Sep 2018 17:53:11 -0300; Kevin, Try QRO King http://www.qroking.com who is a consummate expert at conversion or rehabilitation of the Heathkit SB-220. Herb, KV4FZ _______________________________________________ Amps mailing; /archives//html/Amps/2018-09/msg00008.html (7,462 bytes)
15. [Amps] Alpha 87A problems (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sat, 29 Sep 2018 09:27:34 -0300; My Alpha 87A went to Alpha systems in Colorado for repair of Fault 16 that was occurring within a few seconds of turning it on. After paying $1500 for their repair it was returned and immediately whe; /archives//html/Amps/2018-09/msg00036.html (7,342 bytes)
16. Re: [Amps] Alpha 87A problems (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sat, 29 Sep 2018 14:29:57 -0300; Jerry, Thanks for your reply on this problem I am having with my 87A. Yes, the repairs attempted were by AlphaRFSystems. I have sent many emails to service@ AlphaRFSystems.com but now Glenn is not re; /archives//html/Amps/2018-09/msg00042.html (12,705 bytes)
17. Re: [Amps] Plate Loading Padding Caps (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Sat, 22 Dec 2018 11:16:30 -0400; You might want to check eBay for some used broadcast micas that will handle this. They usually come in 500 pf values and will take the current without heating. Herb, KV4FZ ___________________________; /archives//html/Amps/2018-12/msg00100.html (8,778 bytes)
18. [Amps] Trying to contact AlphaRF Systems without success (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Wed, 9 Jan 2019 10:29:39 -0400; I have sent service@Alpharfsystems.com at least1/2 dozen emails over the past week or more trying to arrange the return of my repaired Alpha 87A but without a single reply. Does anyone know how to co; /archives//html/Amps/2019-01/msg00030.html (7,161 bytes)
19. [Amps] Alpha RF Systems (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Mon, 14 Jan 2019 17:53:29 -0400; Glenn, AE0Q, and company are responding to email requests after a short sabbatical. Herb, KV4FZ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont; /archives//html/Amps/2019-01/msg00067.html (6,663 bytes)
20. Re: [Amps] SS Amps are expensive...why? (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Wed, 23 Jan 2019 09:01:48 -0400; Check this out this for HP Solid State amp. Price is very reasonable and reviews are very positive. http://www.rf-kit.de/ Herb, KV4FZ _______________________________________________ Amps mailing list; /archives//html/Amps/2019-01/msg00107.html (9,203 bytes)

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