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1. [AMPS] Any one have an 8873 or Y621 for sale? (score: 1): Author: apight@pa.net (A P); Date: Sun, 24 Dec 2000 17:09:44 -0500; Hi, Restoring an SB-230. Any help with the tube appreciated. Tnx, Art -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesti; /archives//html/Amps/2000-12/msg00296.html (6,499 bytes)
2. [AMPS] SB200 Retrofit (score: 1): Author: apight@pa.net (A P); Date: Tue, 3 Oct 2000 07:33:56 -0400; . . .and in order to acquire a Q of c. 2, you make the following modifications to your SB200: 1. 2. 3. Please fill in the blanks Rich. Simply stating a Q of 2 is better/mandatory/necessary/neatokeen; /archives//html/Amps/2000-10/msg00063.html (9,427 bytes)
3. [AMPS] SB200 Retrofit (score: 1): Author: apight@pa.net (A P); Date: Tue, 3 Oct 2000 10:47:27 -0400; **snip** response: And if "Any copy of Bill Orr's or the ARRL Handbook have this info in a nice table-type format. These valuable reference tools also have the answers to about 75% of the questions a; /archives//html/Amps/2000-10/msg00067.html (9,214 bytes)
4. [AMPS] Who's who (score: 1): Author: apight@pa.net (A P); Date: Fri, 1 Sep 2000 19:40:19 -0000; Mike, The list of associations and opponents changes often. The product of the process is information. Some more useful than others but interesting for at least a while in each thread. I have garnere; /archives//html/Amps/2000-09/msg00038.html (8,400 bytes)
5. SV: [AMPS] Linearizing Linears, feedback or feedforward (score: 1): Author: apight@pa.net (A P); Date: Tue, 26 Sep 2000 13:04:27 -0400; Considering the preceding email; Would it make sense to directly ground SB-220 grids and fuse the filament/bias transformer such that a ground fault would interrupt filament, bias, and HV? I would pr; /archives//html/Amps/2000-09/msg01055.html (9,990 bytes)
6. SV: [AMPS] Linearizing Linears, feedback or feedforward (score: 1): Author: apight@pa.net (A P); Date: Tue, 26 Sep 2000 15:26:38 -0400; Tnx. At this time I have a 25 Ohm 20W resistor between the output of the rectifier/meter board and the input to the HV choke. It is one of the brown tubular units (it is fairly long. . .). .'goes aro; /archives//html/Amps/2000-09/msg01062.html (10,819 bytes)
7. [AMPS] SB-220 Smoke Test (score: 1): Author: apight@pa.net (A P); Date: Tue, 26 Sep 2000 17:46:34 -0400; First. . .good news Jose. Just keep up the high voltage respect . . . Second. . . SB-220 with directly grounded grid (three rg58 braids on each tube). Smoke test was a complete success. The amp tuned; /archives//html/Amps/2000-09/msg01069.html (7,427 bytes)
8. [AMPS] SB-220 Smoke Test (score: 1): Author: apight@pa.net (A P); Date: Tue, 26 Sep 2000 19:15:39 -0400; Tim, Good point. I measured slightly more output on 10 and 15M - previously around 900W out on 10 and now about 950W. It seems to tune more smoothly but this is pretty subjective. Input SWR was sligh; /archives//html/Amps/2000-09/msg01073.html (10,151 bytes)
9. [AMPS] 3cx1000a7 bias (score: 1): Author: apight@pa.net (a.p.); Date: Sun, 18 Jun 2000 09:40:28 -0400; Hello, I am building a 6M amp and currently deciding on a bias switching scheme. I note in the SB-220 they use a rather high resistance in the zener bias circuit and switch the relay from the 110 (or; /archives//html/Amps/2000-06/msg00234.html (7,039 bytes)
10. [AMPS] SB-220 Conversion Confusion (score: 1): Author: apight@pa.net (a.p.); Date: Mon, 15 May 2000 10:51:29 -0400; Amp aficionados, et al; I have a 6 M SB-220 conversion that works quite well with one tube. Input SWR is 1.1:1 and output plate tune is at about 1/3 mesh. Efficiency is as expected. However, when I p; /archives//html/Amps/2000-05/msg00151.html (7,578 bytes)
11. [AMPS] Proper tuned input adjustment procedure (score: 1): Author: apight@pa.net (a.p.); Date: Fri, 10 Mar 2000 13:34:40 -0500; An SB-200 can be an absolute bear to tame in the input SWR region. There is more at issue here than just the input tuned circuits (which by the way are Q deficient - Mr. Measures will no doubt clue y; /archives//html/Amps/2000-03/msg00556.html (8,954 bytes)
12. [AMPS] Hot Switching (score: 1): Author: apight@pa.net (a.p.); Date: Mon, 20 Mar 2000 19:21:10 -0500; I have used this approach many times for transverters and amplifiers. . . The PTT goes through the radio and out to the switched element which then keys the transmitter on a return pair to the radio; /archives//html/Amps/2000-03/msg00853.html (10,102 bytes)
13. [AMPS] Cavity Amp designs for 432 Mhz and 1200 Mhz?? (score: 1): Author: apight@pa.net (a.p.); Date: Fri, 18 Feb 2000 08:24:07 -0500; Joe, I don't have the design and machining information. I do have a 6 X 7289 1296 amp for sale if you get your "driver" running. : ) Art K3XF -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Sub; /archives//html/Amps/2000-02/msg00318.html (9,953 bytes)
14. [AMPS] R.F. Electronics Solid State KW (score: 1): Author: apight@pa.net (a.p.); Date: Sat, 19 Feb 2000 12:05:42 -0500; Perhaps this is how we can do some public good. If we could provide a "conversion" to allow the current crop of "multi-pill" amplifiers to be used on the amateur bands without generating huge amounts; /archives//html/Amps/2000-02/msg00371.html (10,250 bytes)

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