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1. [Amps] ICOM Parts Availability (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Sat, 21 Nov 2009 14:43:53 -0500; Good Afternoon All, Well, not STRICTLY amps content, maybe, but per chance, are there any ICOM 751's - 751A's out there being parted-out at the present time...? I'm specifically looking for a replace; /archives//html/Amps/2009-11/msg00219.html (6,506 bytes)
2. Re: [Amps] 304TH, 304TL, 813 (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Tue, 8 Sep 2009 08:14:51 -0400; Hi Jerome, I had to smile to myself when I read the very last line of your note (below), i.e. the fact that you'd built the amplifier some 50 years ago... It reminded me a lot of the old story of the; /archives//html/Amps/2009-09/msg00088.html (10,214 bytes)
3. Re: [Amps] 304TH, 304TL, 813 (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Tue, 8 Sep 2009 07:52:38 -0400; Hi John, There is nice little 1954 paperback from CQ that precedes Stoner's book, which the latter borrowed heavily from when he wrote his "New Sideband Handbook"...I believe it's called "Single Side; /archives//html/Amps/2009-09/msg00086.html (11,642 bytes)
4. Re: [Amps] The H&K 304H (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Sun, 6 Sep 2009 08:40:46 -0400; Hi Alex, I'd have to re-check the circuit, & that'd mean digging-up that old QST from my archives... I was SO put off by the notion of that 120-watts of drive, I guess, that mentally I stopped lookin; /archives//html/Amps/2009-09/msg00059.html (10,510 bytes)
5. [Amps] The H&K 304H (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Sat, 5 Sep 2009 10:31:42 -0400; Many thanks to all who took the time to respond to my query about the old Heintz & Kaufmann 304H (their version of the Eimac 304TH, per Lud's note to me)... Well, research into my radio shack library; /archives//html/Amps/2009-09/msg00047.html (7,392 bytes)
6. Re: [Amps] The 304H (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Tue, 1 Sep 2009 10:55:08 -0400; "...It's not worth the effort, as those OLD tubes are probably quite 'gassy' from sitting around for so long." ** Hi Don & Others, Many thanks for all of the interesting comments & suggestions receiv; /archives//html/Amps/2009-09/msg00005.html (8,327 bytes)
7. [Amps] The 304H (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Tue, 1 Sep 2009 08:17:02 -0400; Good Day All, A good Ham radio friend of mine recently blessed me with a donation of three Heintz & Kaufmann 304H triodes (a near-carbon copy of the Eimac 304TH, according to Lud Sibley)... Has anyon; /archives//html/Amps/2009-09/msg00000.html (6,407 bytes)
8. Re: [Amps] spray painting metal (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Fri, 31 Jul 2009 13:01:44 -0400; Hi Alton, Go the distance & pre-spray the project with aluminum/galvanized metal primer that's specifically designed for that sorta stuff... I never did that on a major project that I built here year; /archives//html/Amps/2009-07/msg00438.html (9,675 bytes)
9. Re: [Amps] 833A (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Mon, 2 Mar 2009 07:09:07 -0500; Hi Bob, The ARRL HANDBOOK for 1979(?) / 1980(?) featured a low-band amplifier designed around the 833A...even has a HB RF plate choke! ~73~ Eddy VE3CUI - VE3XZ ** refer to the design is P.J. 2000 on; /archives//html/Amps/2009-03/msg00045.html (7,602 bytes)
10. Re: [Amps] house cleaning AMP parts for sale (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Sun, 1 Mar 2009 10:57:26 -0500; Hi All, Yes, it works A-OK for me now -- musta been either a gremlin(!), or our dial-up server here... ~73~ Eddy VE3CUI - VE3XZ ** I just tried the link and it works. One other person is viewing it a; /archives//html/Amps/2009-03/msg00012.html (10,989 bytes)
11. Re: [Amps] house cleaning AMP parts for sale (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Sun, 1 Mar 2009 08:52:06 -0500; Ooooops...! I take it all back -- it's working now! (must have been a gremlin at my web server, I s'pose). "...Never mind"! ~73~ Eddy VE3CUI - VE3XZ some http://picasaweb.google.com/taldridge/AmpPart; /archives//html/Amps/2009-03/msg00009.html (12,105 bytes)
12. Re: [Amps] house cleaning AMP parts for sale (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Sun, 1 Mar 2009 07:48:23 -0500; Hi All, I tried that web page listed below, but all I get back is "...can not be found." http://spreadsheets.google.com/ccc?key=pgAd1PO-wiqDBz0lSssZgPw Is this address missing something, or am I...?; /archives//html/Amps/2009-03/msg00007.html (10,565 bytes)
13. [Amps] Minimum Value of RF Plate Chokes (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Thu, 26 Feb 2009 13:12:12 -0500; Many thanks, Gary & Paul, for your very informative feedback to my original head-scratching here, Hi Hi. Well, maybe I'm deluding myself here, but I like to at least *think* that I'm somewhat of a pu; /archives//html/Amps/2009-02/msg00685.html (9,539 bytes)
14. Re: [Amps] Minimum Value of RF Plate Chokes (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Thu, 26 Feb 2009 11:06:58 -0500; "...Seems that with a small choke (small inductance for the frequency) the choke is actually tuned to resonance when its reactance is a low value compared to load impedance. If the choke is too small; /archives//html/Amps/2009-02/msg00681.html (8,511 bytes)
15. [Amps] Final Pi Tank Component Values (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Mon, 23 Feb 2009 13:50:17 -0500; Good Day All, The other day, someone asked about the whys & the wherefores of those specific component values as are used in final RF amplifier pi tank circuits... Here's a really quick & easy site t; /archives//html/Amps/2009-02/msg00664.html (6,796 bytes)
16. Re: [Amps] Doorknob quality (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Sun, 22 Feb 2009 08:36:36 -0500; "...When using doorknob capacitors for RF tuning circuits, is there something special I should aware of?" ** Hi Evert, Do not assume that merely because a capacitor like this may be rated for some 20; /archives//html/Amps/2009-02/msg00643.html (8,338 bytes)
17. Re: [Amps] Question for All Amp Builders... (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Fri, 20 Feb 2009 07:15:33 -0500; Hi Scott, It sounds to me like you desperately need to increase the collection of reference books you have there in your Ham radio library...! Hi Hi. ANY ARRL Handbook, or Bill Orr Handbook, has that; /archives//html/Amps/2009-02/msg00584.html (8,775 bytes)
18. [Amps] Minimum Value of RF Plate Chokes (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Thu, 19 Feb 2009 15:00:41 -0500; Good Day All, Many thanks to all who responded to me re. my recent query as to the "...black magic factor"(!) in determining the proper minimum value of plate chokes in linear amplifiers... I was for; /archives//html/Amps/2009-02/msg00574.html (7,451 bytes)
19. [Amps] Homebrewed "SPC" Transmatch (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Tue, 17 Feb 2009 08:24:08 -0500; "...Looks nice Ed but that empty area sure could use the diagram of the tuner. Not all of us are in a position to get it..." ** Hi Again Bob, Et Al, If you click back onto my Flickr website again, yo; /archives//html/Amps/2009-02/msg00533.html (8,155 bytes)
20. Re: [Amps] best atu (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Mon, 16 Feb 2009 18:28:15 -0500; Hi Allan, Well, an ATU (properly designed) will help keep your harmonics / spurious signals from being radiated -- AND it'll add front-end selectivity to your receiver, for starters... "...To each hi; /archives//html/Amps/2009-02/msg00528.html (8,105 bytes)

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