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381. Re: [Amps] Grounded B+ amplifier (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 27 Feb 2004 09:37:11 -0800
** Indeed, Steve, indeed. It also might help folks understand why such a circuit resonates c. 10% lower than the operating frequency. _______________________________________________ Amps mailing lis
/archives//html/Amps/2004-02/msg00290.html (8,607 bytes)

382. RE: [Amps] SB-200 80 Meter dilemma (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 27 Feb 2004 22:15:37 -0800
The bandswitch contacts may have been toasted. The fixes are: replace the burned contacts, or replace the switch wafer. _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2004-02/msg00295.html (8,975 bytes)

383. RE: [Amps] 2 x 8877 (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 29 Feb 2004 16:56:51 -0800
** 2, 8877s at 4kV DC would have a RL of c. 1000-ohms. 3, 3cx800A7s at 2500V DC would have a RL of c. 780-ohms. For a Q of 10, Xc1would need to be 100-ohms and 78-ohms respectively -- i.e., the 3-ho
/archives//html/Amps/2004-02/msg00315.html (9,555 bytes)

384. Re: [Amps] RE: Alpha 87A Problems Solved (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 29 Feb 2004 16:56:50 -0800
** A high-power RF amplifier that incorporates computer technology may be impressive to some potential buyers, but it is probably not a very good idea from a long-term reliability standpoint. cheers
/archives//html/Amps/2004-02/msg00316.html (7,731 bytes)

385. [Amps] (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 29 Feb 2004 16:56:51 -0800
** 10v.10.2a filament, 4kV/450mA. 1000v screen, 100v suppressor. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp
/archives//html/Amps/2004-02/msg00317.html (7,004 bytes)

386. Re: [Amps] 2 x 8877 (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 1 Mar 2004 08:56:32 -0800
** No screen is needed since a 15cm by 10cm or so viewing window would be a waveguide below cutoff for anything a 4-1000A could produce. cheers, Alek _______________________________________________
/archives//html/Amps/2004-03/msg00009.html (11,558 bytes)

387. Re: [Amps] 2 x 8877 (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 1 Mar 2004 08:56:33 -0800
** The ideal viewing window for a 4-1000A would be one that magnifies about 40%.. cheers, Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2004-03/msg00010.html (8,362 bytes)

388. RE: [Amps] RE: Alpha 87A Problems Solved (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 1 Mar 2004 08:56:33 -0800
** Dick -- According to my own survey, c. 60% of owners have had the same experience. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com
/archives//html/Amps/2004-03/msg00011.html (8,242 bytes)

389. [Amps] Needed diagram (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 2 Mar 2004 07:59:21 -0800
** I need a diagram for the Emtron DX-3 that shows the GU-78B, the input circuitry and the neutralization bridge. . Tnx _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2004-03/msg00020.html (6,524 bytes)

390. Re: [Amps] 2 x 8877 (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 2 Mar 2004 12:24:42 -0800
** My guess is that, at 28MHz, the radiation from the antenna is at least 30db stronger than that from the window. . _______________________________________________ Amps mailing list Amps@contesting
/archives//html/Amps/2004-03/msg00022.html (8,472 bytes)

391. Re: [Amps] 2 x 8877 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 3 Mar 2004 07:14:22 -0800
** Ed-- What is the source of such energy? Using a cellphone would seemingly provide more field strength at a more-dangerous-to-corneas wavelength. Perhaps the amplifier builder should provide an sh
/archives//html/Amps/2004-03/msg00032.html (10,790 bytes)

392. Re: [Amps] 2 x 8877 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 3 Mar 2004 10:36:54 -0800
** True enough, Ed, , however, c. half of the voltage waveform at the anode comes from the tank, so conduction angle is not the whole picture. ** If dangerous radiation comes from the anode of a HF
/archives//html/Amps/2004-03/msg00035.html (13,193 bytes)

393. Re: [Amps] sb-220 tuning question - closing in (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 4 Mar 2004 02:47:07 -0800
** For grounded-grid operation, peaking for max-out is somewhat better because a fully-driven, fully loaded-tube has a very slight dip with a Pi-tank. - Starting with a lesser amount of drive is not
/archives//html/Amps/2004-03/msg00037.html (9,862 bytes)

394. Re: [Amps] sb-220 tuning question - closing in (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 4 Mar 2004 02:47:08 -0800
Chortle. This is clearly an understatement, Joe. It's a virtual copy because they copied some of the same mistakes. cheers _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2004-03/msg00038.html (7,883 bytes)

395. Re: [Amps] SB-200 80 Meter Dilemma Update (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 4 Mar 2004 02:47:09 -0800
** This suggests that your drivermight be throttling back to protect itself. ** strange but ** No. - I would try a Pi-network 80m tuned-input with a Q of 2. (Xc!=25-ohms) good luck, Don ____________
/archives//html/Amps/2004-03/msg00039.html (7,973 bytes)

396. Re: [Amps] Looking for pre-amps (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 4 Mar 2004 02:47:09 -0800
I used a simple untuned emitter-follower biased for c. 1mA collector-current.. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2004-03/msg00040.html (7,180 bytes)

397. Re: [Amps] Henry 3K-A (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 5 Mar 2004 00:14:15 -0800
*? 2500W CCS. Easily enough steam for a pair of 8877s. Useful mods are: glitch-R in HV Positive circuit, high-speed switching, glitch diodes across meter movements, lower VHF-Rp suppressors, replace
/archives//html/Amps/2004-03/msg00052.html (8,261 bytes)

398. Re: [Amps] sb-220 tuning question - closing in (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 5 Mar 2004 00:14:15 -0800
** True. When I was 18, I worked at a printshop (Point Mugu) where one employee was printing the green. He apparently got a semi-permanent job in a Federal prison printshop. _________________________
/archives//html/Amps/2004-03/msg00053.html (9,860 bytes)

399. Re: [Amps] AMP INT LK500ZC (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 5 Mar 2004 00:14:14 -0800
Bee - - *? Sounds like maybe a grid/filament shorted (0v bias) tube. Typically, the short only occurs when the filament is hot/expanded. Thus, an ohm-meter check on a cold tube will not detect the p
/archives//html/Amps/2004-03/msg00054.html (8,013 bytes)

400. Re: [Amps] sb-220 tuning question - closing in (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 5 Mar 2004 00:14:16 -0800
** It takes c. 140w to drive a pair of 3-500Zs operating at 2800vdc. ** A pair of 3-500Zs has 0.3pF of feedback C. So, at 110MHz, XC is c. 5000-ohms between the output and the input of the tubes. If
/archives//html/Amps/2004-03/msg00055.html (9,049 bytes)

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