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261. Re: [Amps] Class A for AM (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 15 Nov 2006 10:45:07 -0600
It has to do with the plate load impedance that the tube sees. In order to handle the modulation peaks the load on the tube must show the proper impedance to allow the proper plate voltage swing for
/archives//html/Amps/2006-11/msg00204.html (12,946 bytes)

262. Re: [Amps] Class A for AM (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 15 Nov 2006 11:42:26 -0600
As a further note on efficiency, it is not unique to amplifying an AM signal. The exact same efficiency ratios are present when amplifying an SSB signal or a CW signal. As power level is lowered by d
/archives//html/Amps/2006-11/msg00205.html (14,806 bytes)

263. Re: [Amps] Class A for AM (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 15 Nov 2006 17:53:39 -0600
Hi Jeff, No that's not really the case. The plate current peaks have to go just as high in class A as they do in class B. The difference is that on the negative swing of grid drive the class A amplif
/archives//html/Amps/2006-11/msg00208.html (13,210 bytes)

264. Re: [Amps] 30L-1 filter caps (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 13 Dec 2006 15:19:24 -0500
Rich Measures has the best deals on caps, resistors and diodes. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman
/archives//html/Amps/2006-12/msg00083.html (8,746 bytes)

265. Re: [Amps] Error - safety issue (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 24 Dec 2006 13:37:20 -0500
That gives you two diodes in series and back to back. If you only want one diode voltage drop then you need to connect the + and - together and the two AC leads together. Then connect the AC leads po
/archives//html/Amps/2006-12/msg00208.html (8,200 bytes)

266. Re: [Amps] swr (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 4 Jan 2007 16:47:55 -0500
The capacitance of the cable does not get added to the input circuit because the cable is a transmission line. If the capacitance of the cable did get added to a matching network then it would chang
/archives//html/Amps/2007-01/msg00060.html (9,085 bytes)

267. Re: [Amps] schamatis 160 meter amp using 3cx3000a7 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 12 Jan 2007 13:43:33 -0500
What if the tube in question is a 4CX1000 and not a 4-1000? Why not just spell it out like most of the world is used to seeing rather than trying to be cryptic or do short hand. More letters from the
/archives//html/Amps/2007-01/msg00092.html (10,080 bytes)

268. Re: [Amps] schamatis 160 meter amp using 3cx3000a7 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 12 Jan 2007 19:46:01 -0500
Like Bill I have been in the game in excess of 45 years, I am not exactly ignorant of high power tubes and amplifiers, and haven't heard this stuff until recently. Being on a list that is supposed to
/archives//html/Amps/2007-01/msg00099.html (15,019 bytes)

269. Re: [Amps] schamatis 160 meter amp using 3cx3000a7 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 12 Jan 2007 20:45:01 -0500
I just know there's sumthin cryptic in there. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-01/msg00104.html (17,953 bytes)

270. Re: [Amps] How best to reduce filament voltage? (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 2 Feb 2007 11:24:22 -0500
The transformer in question is a power transformer not just a filament transformer. It also supplies the high voltage. 73 Gary K4FMX _______________________________________________ Amps mailing list
/archives//html/Amps/2007-02/msg00019.html (12,465 bytes)

271. Re: [Amps] cooling tubes (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Tue, 6 Feb 2007 16:14:31 -0500
There are muffin fans and there are muffin fans. Some are capable of working under a fair amount of back pressure and some are not. You need to look at the specs on the particular fan used. 73 Gary K
/archives//html/Amps/2007-02/msg00097.html (8,748 bytes)

272. Re: [Amps] Drake L4B (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 7 Feb 2007 10:34:26 -0500
When installing new diodes don't forget to remove the diode equalizing resistors on the boards. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2007-02/msg00119.html (8,342 bytes)

273. Re: [Amps] General question on filament life (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 9 Feb 2007 12:35:28 -0500
I think that the tube manuals somewhere state that the 813 should be turned off if it is idle for more than 30 minutes. ?? Not sure on the time. 73 Gary K4FMX ________________________________________
/archives//html/Amps/2007-02/msg00164.html (10,508 bytes)

274. Re: [Amps] General question on filament life: comments (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 11 Feb 2007 22:02:31 -0500
I have dimmers on lots of lights in my house and it seems I replace a light bulb at least once a month on those circuits. They seem to go bad while they are on. I can hear them making a rather loud
/archives//html/Amps/2007-02/msg00202.html (8,860 bytes)

275. Re: [Amps] 1 tube or two ?? (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 12 Feb 2007 14:29:23 -0500
If we are talking a linear amp here then 6KV @1.0 A is pushing it a little on a single 4-1000A wouldn't you say? 6 KW input at 60% efficiency should give around 3600 watts out. 6000 watts - 3600 wat
/archives//html/Amps/2007-02/msg00229.html (8,870 bytes)

276. Re: [Amps] Tubes <==> Neat? tspa (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 15 Feb 2007 14:18:46 -0500
Thanks for the nice web site John! 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-02/msg00251.html (7,337 bytes)

277. Re: [Amps] Getting rid of blower noise (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 19 Feb 2007 15:24:03 -0500
A couple of things you might try to help: A filter of open cell foam sheet placed over the inlet of the blower will reduce some of the noise, maybe a lot of it. If there is a wall behind the amplifie
/archives//html/Amps/2007-02/msg00304.html (11,580 bytes)

278. Re: [Amps] Edge wound inductors (score: 1)
Author: garyschafer@comcast.net
Date: Wed, 28 Feb 2007 16:22:48 +0000
I assume that you are comparing an edge wound inductor height to that of a similar height round wire. By shaving off the sides of the wire to make it a flat edge wound coil wouldn't you be reducing t
/archives//html/Amps/2007-02/msg00415.html (9,374 bytes)

279. Re: [Amps] B&W FC-30 Filament Choke: EPILOGUE (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 4 Mar 2007 10:33:27 -0500
I have a pair of 813's in GG that I built many years ago and I built a filament choke from a TV flyback core. It works fine. If I remember right I cut the ends off one of the C sections to make a st
/archives//html/Amps/2007-03/msg00053.html (9,149 bytes)

280. Re: [Amps] Old Power Cord (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 4 Mar 2007 16:01:11 -0500
Why would you want to do that? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-03/msg00064.html (7,856 bytes)

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