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1. [AMPS] For who well know 8877 (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Sat, 29 Dec 2001 13:30:05 -0500; Your grid current is too high for sustained operation. Based on your comments below, you are loading the amplifier too lightly for the available drive. Eimac's data sheet values generally represent; /archives//html/Amps/2001-12/msg00510.html (9,148 bytes)
2. [AMPS] AL1500 (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Mon, 3 Dec 2001 20:43:42 -0500; Alex, Quite simply, you received the "FCC version" of the spec sheet! The 8877/3CX1500A7 and 3CX800A7 were first being sampled to the amateur amplifier manufacturers about the same time as the FCC wa; /archives//html/Amps/2001-12/msg00055.html (9,386 bytes)
3. [AMPS] more about the input swamp circuit (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Mon, 12 Nov 2001 15:14:33 -0500; The Eimac data sheet for the 3CX800A7 gives 80 volts peak rf cathode voltage and 36 watts of peak drive. The Svetlana data sheet for the 3CX800A7 gives an input impedance of 54 Ohms. Since the data; /archives//html/Amps/2001-11/msg00205.html (7,735 bytes)
4. [AMPS] SB-220 cooling (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Fri, 12 Oct 2001 18:23:18 -0400; As usual, when shown to be wrong you point in a different direction. Without the case, lethal voltages are exposed in the SB-200. If the operator is careful, it is not a problem. If the operator is; /archives//html/Amps/2001-10/msg00311.html (8,612 bytes)
5. [AMPS] SB-220 cooling (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Fri, 12 Oct 2001 14:35:48 -0400; All it takes is an unintentional "slip" during a contest (knock something off an adjacent shelf). That's the point ... not that someone will intentionally reach into that area ... but that it is ope; /archives//html/Amps/2001-10/msg00305.html (9,346 bytes)
6. [AMPS] National 2000 (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Fri, 12 Oct 2001 11:44:54 -0400; I suspect you've answered your own question if you think about it. The plate power switch is probably "welded" in on position. Unplug the amplifier, discharge the capacitors and then check the plate; /archives//html/Amps/2001-10/msg00301.html (7,119 bytes)
7. [AMPS] SB-220 cooling (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Fri, 12 Oct 2001 11:12:55 -0400; Unless I'm mistaken, the "business end" of the capacitor bank and the bleeder string are exposed just behind the right side of the front panel (behind the meters). I don't recall any shield between t; /archives//html/Amps/2001-10/msg00298.html (8,453 bytes)
8. [AMPS] FW: BOUNCE amps@contesting.com : Non-member submission from ["Mike McCarthy, W1NR" <w1nr@eecorp.com>] (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Wed, 10 Oct 2001 13:12:31 -0400; approved 8877 Message-ID: <3BC47CAF.7F45BFF@eecorp.com> To: <amps@contesting.com> Date: Wed, 10 Oct 2001 12:51:59 -0400 From: "Mike McCarthy, W1NR" <w1nr@eecorp.com> X-Mailer: Mozilla 4.76 [en] (Wind; /archives//html/Amps/2001-10/msg00267.html (8,019 bytes)
9. [AMPS] Enough with the Beer ... (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Tue, 9 Oct 2001 11:12:17 -0400; OK, folks. With Will in 3D2/c, I've been handling the administrative stuff here. In the last day or so, I have received several private e-mails complaining about the "off topic" traffic. Although it; /archives//html/Amps/2001-10/msg00229.html (7,109 bytes)
10. [AMPS] New Tube in SB-230 (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Fri, 28 Sep 2001 19:12:47 -0400; Tom, The SB-230 used a single 8873 (conduction cooled 3CX400A7/8874). The power supply is quite low for the GI-7b (or 572B) providing about 2100 volts vs. the 2800 volts or more required for the glas; /archives//html/Amps/2001-09/msg00486.html (9,542 bytes)
11. [AMPS] MLA-2500 (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Sat, 25 Aug 2001 20:57:05 -0400; Before I put this on eBay ... For sale MLA-2500 without tubes - $300 plus shipping. This is a perfect "project amplifier" for someone looking to do one of the alternative tube conversions. Amplifier; /archives//html/Amps/2001-08/msg00327.html (6,648 bytes)
12. [AMPS] Amp parts at Huntsville. (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Mon, 20 Aug 2001 12:08:37 -0400; If it's Allen Bond (and it probably is based on the web site. Try http://www.mgs4u.com/#president With the area code changes, his number is (770) 973-6251. Allen Bond 221 Greencrest Ct. Marietta, Ga.; /archives//html/Amps/2001-08/msg00241.html (8,876 bytes)
13. [AMPS] Label Stock for Laser Printers (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Mon, 16 Jul 2001 17:51:26 -0400; Check with drafting/electronics supply sources ... there are "self-laminating" labels designed for both dot matrix and laser printers. These have an area which takes the print and a clear "over wrap; /archives//html/Amps/2001-07/msg00182.html (8,248 bytes)
14. [AMPS] [Fwd: {Collins} Tube Filament Voltages] (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Sun, 24 Dec 2000 12:07:52 -0500; Considering the source, believe it. There is a very good reason the manufacturers specify a warm-up period for indirectly heated cathode tubes ... to make certain that the cathode does not run too co; /archives//html/Amps/2000-12/msg00286.html (11,351 bytes)
15. [AMPS] Alpha 374 cathode circuit (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Sun, 17 Dec 2000 09:51:43 -0500; The Alpha input network was a three winding auto-transformer with the input at the two winding point - a 2.25:1 un-un. It was about 1.25" OD but unfortunately, I do not have specifications for the co; /archives//html/Amps/2000-12/msg00260.html (6,928 bytes)
16. [AMPS] Drake L-7 ... (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Wed, 22 Nov 2000 20:47:17 -0500; I recently picked up a very clean, unmodified L-7. Does anyone have 10 meter modification information? I'm also looking for any reliability upgrades that anyone might have. 73, ... Joe Subich, K4IK (; /archives//html/Amps/2000-11/msg00323.html (6,608 bytes)
17. [AMPS] Screen protection WHAAAATTTTTT!!!! (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Mon, 16 Oct 2000 19:28:31 -0400; Conrad Writes ... Make that trip a fast zero crossing solid state relay in the primary of the screen supply. The SSR should "open" at the zero voltage point and, with the proper MOV to limit the indu; /archives//html/Amps/2000-10/msg00412.html (8,333 bytes)
18. [AMPS] Switches (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Sat, 14 Oct 2000 09:13:32 -0400; Was Alpha using RSC switches or something built in LZ in the 91B? At one time I seem to remember that part of the hype concerning the lower cost was due to off shore components that were "built unde; /archives//html/Amps/2000-10/msg00298.html (9,192 bytes)
19. [AMPS] Switches (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Sat, 14 Oct 2000 09:13:29 -0400; Just because you haven't heard of it doesn't make it invalid. Although it is not used in amateur amplifiers since the single pi was "good enough" for tube exciters, more complex networks are often u; /archives//html/Amps/2000-10/msg00297.html (8,548 bytes)
20. [AMPS] Switches (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Fri, 13 Oct 2000 14:03:13 -0400; This topic got started because Tom asked if anyone knew of a source of switches (in commercial quantities) at a better price, better availability than the JV-9000 or Radio Switch. He was particularl; /archives//html/Amps/2000-10/msg00287.html (8,837 bytes)

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