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Total 406 documents matching your query.

221. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Mon, 27 Jul 2015 07:15:08 +0300
You don't bypass the neutralizing cap. You reduce the value of the bypass cap at the cold end (away from the grid) of the grid tank circuit so that it will above ground for RF to some extent. You con
/archives//html/Amps/2015-07/msg00153.html (11,402 bytes)

222. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Mon, 27 Jul 2015 17:49:12 +0300
OK, it has a PI input. I suspect there was originally a swamping resistor from grid to ground and the PI circuit is intended as a low-pass filter matching device to compensate for the grid-cathode ca
/archives//html/Amps/2015-07/msg00157.html (10,780 bytes)

223. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 28 Jul 2015 06:58:30 +0300
I suggested to the original poster that he make it a swamped class AB1 amplifier. He will get plenty of drive with a 50-ohm swamping resistor. The only tuning he needs is a small coil to balance out
/archives//html/Amps/2015-07/msg00168.html (11,109 bytes)

224. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Tue, 28 Jul 2015 06:59:20 +0300
Great minds think alike! 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ 73 Dick, K5AND REPLY: I see a potential problem with that. Having only the single variable capacitor will case
/archives//html/Amps/2015-07/msg00169.html (11,510 bytes)

225. Re: [Amps] IMD and spurious measurements (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Sat, 8 Aug 2015 21:26:29 +0300
I had a problem that a nearby 50 kW BC station was picked up by my vertical antenna, causing the diode TR switch in my K3 to conduct, and squirting junk all over my receiver. It didn't occur to me th
/archives//html/Amps/2015-08/msg00011.html (15,198 bytes)

226. Re: [Amps] Amp output power (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Tue, 25 Aug 2015 21:59:17 +0300
I think, all things considered, that if I were building another amplifier I would use an 8877 in GG. Easy to tune (unlike my last tetrode amp), no regulated screen supply needed, no worries about gri
/archives//html/Amps/2015-08/msg00095.html (10,051 bytes)

227. Re: [Amps] vacuum relay (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Wed, 9 Sep 2015 09:49:37 +0300
Usually people use two SPDT relays. The input relay can be a fast, inexpensive reed relay. It makes it easier to sequence the input and output switching when there are two relays. Vic 4X6GP/K2VCO ___
/archives//html/Amps/2015-09/msg00032.html (7,241 bytes)

228. Re: [Amps] Tl 922 mods (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Wed, 28 Oct 2015 23:30:18 +0200
W8ZR designed a sequencer board sold by Harbach which will protect your relays, amplifier and transceiver. See <http://w8zr.net/QSK/index.htm>. This is the best way. Whatever you do, you should read
/archives//html/Amps/2015-10/msg00058.html (8,392 bytes)

229. Re: [Amps] Switching out a Henry choke (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Thu, 29 Oct 2015 06:30:02 +0200
It would be a lot safer and easier just to convert to a capacitor-only filter and use a soft start circuit in the primary circuit. Vic 4X6GP/K2VCO _______________________________________________ Amps
/archives//html/Amps/2015-10/msg00071.html (7,664 bytes)

230. Re: [Amps] Tl 922 mods (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Thu, 29 Oct 2015 06:35:23 +0200
That's what I said in the second paragraph of my post. Vic 4X6GP/K2VCO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
/archives//html/Amps/2015-10/msg00072.html (10,487 bytes)

231. Re: [Amps] GS-35b 10M+6M dual-band (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Wed, 4 Nov 2015 20:29:49 +0200
It's a regular PI network with a small coil between the blocking capacitor and the tuning capacitor. So it becomes an L-C-L-C network. 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ T
/archives//html/Amps/2015-11/msg00011.html (9,919 bytes)

232. Re: [Amps] Question about SPE 1.3K-FA amplifier (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Mon, 9 Nov 2015 09:01:02 +0200
Wouldn't they be measuring the combined IMD of the transceiver (ICOM 7800) and the amplifier with this test setup? About -32 dB 3rd order IMD is not so great. 73, Vic, 4X6GP/K2VCO Rehovot, Israel htt
/archives//html/Amps/2015-11/msg00031.html (9,302 bytes)

233. Re: [Amps] Ugly Amp Power Supply (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Sun, 6 Dec 2015 09:44:50 +0200
I like the Tupperware insulating enclosure inside the PS. Can't tell what's in it, but I've often used them for baluns and antenna tuning components. 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.q
/archives//html/Amps/2015-12/msg00029.html (7,543 bytes)

234. Re: [Amps] Need for bias switch (CW/SSB) (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 17 Jan 2016 19:26:09 +0200
Close to cutoff is class B. If the amplifier has a combination of fixed bias plus some way of generating additional bias when driven (e.g. a grid resistor in a grid-driven amp) then it can move deepe
/archives//html/Amps/2016-01/msg00021.html (9,778 bytes)

235. Re: [Amps] SB 220 Exploding Resistor (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 17 Jan 2016 19:56:19 +0200
This is a 'glitch resistor' intended to protect tubes and other components against arcs caused by gassy tubes. You might replace it with a 25 or 50 ohm 50w resistor and it will work fine, if the tube
/archives//html/Amps/2016-01/msg00022.html (9,194 bytes)

236. [Amps] Impressive solid-state 1.5 kW amp (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Tue, 23 Feb 2016 10:24:39 +0200
If this is real, it looks like what we (those of us who can afford it!) have been waiting for. <http://www.dedicatedrf.com/> -- 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ ________
/archives//html/Amps/2016-02/msg00054.html (6,640 bytes)

237. Re: [Amps] : Impressive solid-state 1.5 kW amp (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Thu, 25 Feb 2016 09:48:58 +0200
It has an unneeded slash at the beginning. Try [1]http://www.dedicatedrf.com In plain text [2]<http://www.dedicatedrf.com> 73, Vic, 4X6GP/K2VCO Rehovot, Israel [3]http://www.qsl.net/k2vco/ It doesn't
/archives//html/Amps/2016-02/msg00061.html (9,064 bytes)

238. Re: [Amps] WOW! (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Mon, 28 Mar 2016 20:13:26 +0300
The tank circuit is especially impressive. Note the short lead to the plate cap. 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ 73, Roger _____________________________________________
/archives//html/Amps/2016-03/msg00042.html (7,203 bytes)

239. Re: [Amps] 3-500Z tube problems (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Mon, 13 Jun 2016 16:39:45 +0300
I have seen a few of these in genuine Eimacs from a specific period. I don't recall the date codes, but I'm sure someone here knows. The problem was bad welds which allowed the grid assembly to move
/archives//html/Amps/2016-06/msg00036.html (9,128 bytes)

240. Re: [Amps] Anybody remember... KW mobile amp installation (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 15 Jun 2016 19:35:24 +0300
I worked W6AM from his mobile one day in 1958 on 20m. I was in NY and he was good and loud. I had a card with a picture, but unfortunately I lost it. But here is the same picture that I remember from
/archives//html/Amps/2016-06/msg00053.html (9,151 bytes)

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