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341. Re: [Amps] Power transformer for 600 watt rig (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 19 Mar 2008 16:33:24 -0400
No I said that if you were going to use a choke that it should be a tuned choke. There is no way that you will get good dynamic regulation with a regular choke or a swinging choke in an SSB power su
/archives//html/Amps/2008-03/msg00179.html (9,370 bytes)

342. Re: [Amps] Power transformer for 600 watt rig (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 19 Mar 2008 17:41:48 -0400
I would suggest that you might want to read some of the modern stuff on power supplies but if you have no interest and feel it is a waste of time then this discussion is pointless. 73 Gary K4FMX ___
/archives//html/Amps/2008-03/msg00181.html (11,457 bytes)

343. Re: [Amps] Heathkit Warrior High Plate Current (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Tue, 21 Oct 2008 18:10:02 -0500
Check the meter shunt. Hook a known good meter in series with the plate current meter circuit to see if they read the same. Keep your fingers out of the high voltage. 73 Gary K4FMX __________________
/archives//html/Amps/2008-10/msg00090.html (9,687 bytes)

344. [Amps] Chinese 3-500 tubes what manufacturer? (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sat, 29 Nov 2008 20:12:43 -0600
Who are the manufacturers of the 3-500 tubes in China and where in China are they located? Thanks Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http
/archives//html/Amps/2008-11/msg00248.html (6,813 bytes)

345. Re: [Amps] Alpha 77Dx Filament Mod Update (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 1 Feb 2009 11:23:45 -0500
Hi Paul, I was always under the impression that the 8877 should have the filament tied to the cathode in the amp as there is little tolerance in the voltage that the tube can withstand between cathod
/archives//html/Amps/2009-02/msg00006.html (12,207 bytes)

346. Re: [Amps] Dual tetrode in grounded grid (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 11 Feb 2009 15:51:25 -0500
The other problem with it is you can't run the plates in push pull and drive the common cathode as it will cancel the output. You would need to run the plates in parallel but then there is the proble
/archives//html/Amps/2009-02/msg00334.html (10,130 bytes)

347. Re: [Amps] Autotuners in Amps (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 11 Feb 2009 22:33:14 -0500
It would be a good idea but as I understand that tuner was an L network tuner and not a pi network. Not good for a tuned input as there is no capacitor placed across the cathode with that type tuner.
/archives//html/Amps/2009-02/msg00345.html (7,846 bytes)

348. Re: [Amps] 1625 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 12 Feb 2009 12:22:06 -0500
The "four in line" was four 1625s mounted in line that were grid driven in push pull parallel arrangement. Each side of the push pull circuit had two tubes in parallel. Getting old when you remember
/archives//html/Amps/2009-02/msg00364.html (9,301 bytes)

349. Re: [Amps] 1625 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 12 Feb 2009 12:40:03 -0500
I remember an article for a grounded grid amp with four 1625s that used the antenna roller coil from a command set as the tank coil. No cathode choke as it was intended to be use with an exciter with
/archives//html/Amps/2009-02/msg00369.html (9,734 bytes)

350. Re: [Amps] Transformer heating (problem?) (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 12 Feb 2009 12:44:41 -0500
If you ran a drill thru the bolt holes you probably created a short from plate to plate in doing so. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2009-02/msg00370.html (14,511 bytes)

351. [Amps] 8877/3CX1500A7 Socket wanted (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 22 Feb 2009 18:13:36 -0500
I am looking for a socket for the 8877/3CX1500A7. I need the one with the grid grounding clips and the spacer plate. I have plenty of the flat ceramic type that fit a 5894 etc. Thanks Gary K4FMX ____
/archives//html/Amps/2009-02/msg00650.html (6,622 bytes)

352. Re: [Amps] Doorknob quality (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 23 Feb 2009 12:30:13 -0500
While the site quoted has the info in there, it is kind of hard to follow/read. Here is an example of how to size a plate padding capacitor. Let's assume we have an amp with a plate load impedance of
/archives//html/Amps/2009-02/msg00662.html (11,292 bytes)

353. Re: [Amps] 4CX1500B cathode Connection (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 23 Feb 2009 14:29:12 -0500
Hi Dave, The link to your site does not work. Thanks Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-02/msg00666.html (9,777 bytes)

354. Re: [Amps] Minimum Value of RF Plate Chokes (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 25 Feb 2009 23:49:07 -0500
Hi Ed, While the Doug Demaw article tells you how to wind a choke it stops short of telling you how it works. While discussing this very thing the other day with a friend is seems that with a small c
/archives//html/Amps/2009-02/msg00679.html (10,462 bytes)

355. [Amps] WTB 15 volt 15 amp filament transformer (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sat, 28 Feb 2009 15:35:35 -0500
I am looking for a 15 (to 18) volt at 15 amp filament transformer for a YC-156. Also still looking for an 8877 socket with the grid clips and spacer. Thanks! Gary K4FMX ______________________________
/archives//html/Amps/2009-02/msg00737.html (6,866 bytes)

356. Re: [Amps] caps across rectifier diodes (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 1 Mar 2009 15:25:29 -0500
No, modern diodes don't need or want resistors or capacitors across them. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c
/archives//html/Amps/2009-03/msg00025.html (8,296 bytes)

357. Re: [Amps] HV Divider, Problem Solved (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 1 Mar 2009 15:48:06 -0500
Scott, Just ohms law: first you need to find the current thru the whole divider between B+ and ground. E/R = I In this case 10 meg + 50K. So then, 2350/10050000 = .00023 amps. Then use IxR = V to fin
/archives//html/Amps/2009-03/msg00031.html (12,743 bytes)

358. Re: [Amps] caps across rectifier diodes (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 2 Mar 2009 14:27:05 -0500
Diodes today are built differently than they were years ago. The old diodes had no reverse current protection in them and external resistors were used to equalize reverse voltage across the string so
/archives//html/Amps/2009-03/msg00066.html (12,465 bytes)

359. Re: [Amps] caps across rectifier diodes (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 2 Mar 2009 14:23:18 -0500
Diodes today are built differently than they were years ago. The old diodes had no reverse current protection in them and external resistors were used to equalize reverse voltage across the string so
/archives//html/Amps/2009-03/msg00088.html (13,137 bytes)

360. Re: [Amps] Panel Meter Article, QST (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 4 Mar 2009 20:51:42 -0500
Scott, Jeff's method is ok but the way I usually do it is the same except I also hook my dvm in series and put it on the Ma scale. Now you can read directly on the digital dvm and compare it with the
/archives//html/Amps/2009-03/msg00124.html (11,593 bytes)

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