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361. Re: [Amps] ARB-704 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 18 Feb 2004 01:58:34 -0800
** Bob -- Although it's more work on your part, one solution is to convert the SB-201 from a negative to a positive relay supply V, remove the original relay and cockamamie bias switching scheme, and
/archives//html/Amps/2004-02/msg00162.html (7,367 bytes)

362. Re: [Amps] Output Impedance 4-572B's in Parallel (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 18 Feb 2004 01:58:36 -0800
** RL is a function of the anode supply V.. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2004-02/msg00163.html (7,622 bytes)

363. Re: [Amps] sb-220 on 17 meters (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 22 Feb 2004 07:21:57 -0800
** What is the plate/anode current reading with key-down/A&Oslash; emission on the CW tap? What is the input SWR? Tnx _______________________________________________ Amps mailing list Amps@contestin
/archives//html/Amps/2004-02/msg00204.html (7,731 bytes)

364. Re: [Amps] Sb-220 grid Chokes (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 24 Feb 2004 01:02:20 -0800
** Disc ceramics have less less L than silver-micas. Also, the grid-gnd circuit is not part of the tuned input circuit, so the stability of a silver mica is not needed. ______________________________
/archives//html/Amps/2004-02/msg00217.html (7,416 bytes)

365. Re: [Amps] sb-220 on 17 meters (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 24 Feb 2004 01:02:21 -0800
** Is the SB-220's 20m tuned input modified? Normally, the 17m input SWR is over 2 to 1 using the 20m switch position. _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2004-02/msg00218.html (9,542 bytes)

366. Re: [Amps] Need Svetlana 3CX2500F3 Info (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 24 Feb 2004 01:02:21 -0800
** Hello, Ron - - Both are the cathode since it is a directly-heated filament-type electron tube -- i.e., thoriated tungsten filament/cathode. Is the ... F3 going to used as a linear amplifier?. ___
/archives//html/Amps/2004-02/msg00219.html (7,179 bytes)

367. Re: [Amps] muffin fans (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 25 Feb 2004 00:37:02 -0800
** For even more pressure, use a radial-wheel centrifugal blower. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a
/archives//html/Amps/2004-02/msg00237.html (8,317 bytes)

368. Re: [Amps] sb-220 non uniform grid current ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 25 Feb 2004 00:37:01 -0800
With 700 - 800mA key-down on the CW tap, what is the grid-I? Tnx. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/am
/archives//html/Amps/2004-02/msg00238.html (7,905 bytes)

369. Re: [Amps] Thanks for the 3CX2500F3 Info (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 25 Feb 2004 07:06:04 -0800
** For a fun project, why not try the 8171in ultra-linear Class A @ 1400w out ? It's easy to cool, easy to drive, has plenty of emission, doesn't make x-rays, and if push comes to shove, you can run
/archives//html/Amps/2004-02/msg00242.html (8,449 bytes)

370. Re: [Amps] sb-220 non uniform grid current ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 25 Feb 2004 09:28:48 -0800
** Thanks. These grid-I figures seem normal to me. However, the ZSAC (zero signal anode current) seems a bit low. With the reduced anode supply V on the CW tap, grid current is higher because the ano
/archives//html/Amps/2004-02/msg00245.html (9,911 bytes)

371. Re: [Amps] sb-220 non uniform grid current ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 25 Feb 2004 13:21:21 -0800
ur welcome, Dan. The preferable way to tune an amp is with max drive, with the amp Tune and Load adjusted alternately for max out. Tuning a 220 with high speed dits is safest. ______________________
/archives//html/Amps/2004-02/msg00248.html (11,635 bytes)

372. Re: [Amps] ITT Jennings part numbers (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 26 Feb 2004 06:27:45 -0800
The DC V rating is either 3kV or 5kV. Normally, a suffix of 3S or 5S is used to designate which is which. I would measure the DC breakdown V with a high-pot tester to determine which one it is, and
/archives//html/Amps/2004-02/msg00259.html (7,438 bytes)

373. Re: [Amps] Sb-220 grid Chokes (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 26 Feb 2004 06:27:46 -0800
** More grid-gnd bypass C is needed with a fusing resistor in order to protect it from RF on 10m - due to the 5pF anode-grid C. Thus, the original 3 x 200pF or so caps need to be padded with an addit
/archives//html/Amps/2004-02/msg00260.html (9,160 bytes)

374. Re: [Amps] sb-220 non uniform grid current ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 26 Feb 2004 07:02:49 -0800
** Luck is not of any value. Knowledge is. To tune up a g-g amp, apply 100% of drive, preferably pulsed at 20 - 30 pps - unless one is tuning an amp with a 2500w HV-PS (Henry 3KA), and Tune/Load for
/archives//html/Amps/2004-02/msg00261.html (8,870 bytes)

375. Re: [Amps] sb-220 non uniform grid current ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 26 Feb 2004 07:34:55 -0800
** True enough, Vic, however, no transceiver currently being manufactured is clean enough to show the improvement from heavier loading. _______________________________________________ Amps mailing l
/archives//html/Amps/2004-02/msg00262.html (8,257 bytes)

376. Re: [Amps] Grounded B+ amplifier (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 27 Feb 2004 03:40:22 -0800
** Such a circuit is high-pass, although it does eliminate any RFC in the anode circuit. For a low-pass configuration, a RFC would be needed to keep the anode at DC-ground potential. ** Insulating t
/archives//html/Amps/2004-02/msg00278.html (10,276 bytes)

377. Re: [Amps] Choosing a first amp (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 27 Feb 2004 03:40:23 -0800
** The SB-220 is probably the best value - and it makes a nice driver for a serious contesting g-g amplifier - such as an 8160. However, a pair of 3-500Zs have c. 0.3pF of feedback-C, so improving t
/archives//html/Amps/2004-02/msg00279.html (7,900 bytes)

378. Re: [Amps] SB-200 80 Meter dilemma (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 27 Feb 2004 03:40:24 -0800
** Sounds like the 80m Tune-C padder cap switch contacts have been evaporated by occasionally arcing when they are open (40m - 10m). The arcing is apparently caused by an intermittent VHF parasite. T
/archives//html/Amps/2004-02/msg00280.html (7,829 bytes)

379. Re: [Amps] 2 x 8877 (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 27 Feb 2004 09:37:11 -0800
** Paul -- 2, 8877s cost about the same as a Svetlana 8170. 8877s are more delicate, and they require at least a 180-second warmup. 8170s are good to go in under 1-second. The input circuit for an C
/archives//html/Amps/2004-02/msg00288.html (7,676 bytes)

380. Re: [Amps] plate supply ratings and thoughts (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 27 Feb 2004 09:37:12 -0800
** Good point, however, this is mostly a factor in conventional core transformers. For a Hipersil&reg; core transformer, coupling loss is a minor factor. ____________________________________________
/archives//html/Amps/2004-02/msg00289.html (7,900 bytes)

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