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161. Re: [Amps] Hipot tester Info Needed (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 13 Feb 2006 11:22:49 -0500
An easy way to get a nice hipot tester is to pick up one of the AC units that no one wants. They can be had very cheap. I got a 5 kv AC unit then built a simple voltage doubler to be used external to
/archives//html/Amps/2006-02/msg00237.html (10,985 bytes)

162. Re: [Amps] GG Class C (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 17 Feb 2006 11:19:01 -0500
Hi Jeff, That's a really long post! My thoughts on modulating a GG class C amp. The amount of driver power that doesn't need to be modulated is that amount that is used up as actual grid drive in the
/archives//html/Amps/2006-02/msg00313.html (16,352 bytes)

163. Re: [Amps] Passive grid triodes? (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 17 Feb 2006 20:42:19 -0500
I believe stability is the main problem with a triode. In non grounded grid operation there is no shield between plate and the active grid. It most always needs to be neutralized. The fact that a tub
/archives//html/Amps/2006-02/msg00325.html (11,029 bytes)

164. Re: [Amps] 87A vs. IC-PW1 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 22 Feb 2006 17:38:17 -0500
I guess that then makes all SSB contesters lids? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-02/msg00404.html (9,138 bytes)

165. Re: [Amps] 87A vs. IC-PW1 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 22 Feb 2006 20:03:57 -0500
"A refresher course in logic", I would say that might be in order here. QSK can be done on SSB as well as CW although no one that I know is set up to do so, but it can be done between syllables of s
/archives//html/Amps/2006-02/msg00412.html (10,353 bytes)

166. Re: [Amps] HB amps (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 3 Mar 2006 14:32:26 -0500
A pair of 813's will easily produce 600 watts output and do it for years and years. They are very rugged tubes. I have an amp with a pair of them that I built in the mid 60's and it still has the sa
/archives//html/Amps/2006-03/msg00042.html (10,611 bytes)

167. Re: [Amps] HB amps (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 3 Mar 2006 17:36:41 -0500
It is GG. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-03/msg00048.html (9,867 bytes)

168. Re: [Amps] HB amps (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 3 Mar 2006 17:39:39 -0500
It has been many years since I looked at the IMD on them but remember that it was not real terrible. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2006-03/msg00050.html (10,660 bytes)

169. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 22 Mar 2006 23:22:42 -0500
There was some discussion on this board awhile back and wasn't it decided that the tuner is actually an L network and not a PI? That would make it unsuitable as a tuned input network. 73 Gary K4FMX _
/archives//html/Amps/2006-03/msg00609.html (10,163 bytes)

170. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 23 Mar 2006 11:33:06 -0500
It is the input waveform of the amp that matters, not the output wave form. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
/archives//html/Amps/2006-03/msg00615.html (13,138 bytes)

171. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 24 Mar 2006 11:45:39 -0500
Yes you are right they do "both matter" but my point was that with the high Q output tank circuit of the amp it is going to clean up the waveform pretty well to where I don't think you would see any
/archives//html/Amps/2006-03/msg00637.html (15,876 bytes)

172. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 24 Mar 2006 11:47:44 -0500
With an L network if the tube impedance is lower than the driver impedance then there will be a coil to ground at the cathode rather than the needed capacitor. If the cathode impedance is higher than
/archives//html/Amps/2006-03/msg00638.html (13,389 bytes)

173. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 24 Mar 2006 15:02:29 -0500
That is exactly the point! That is why I said "you might as well use the tuner in the driver" if you don't have enough capacitance at the cathode with the L network tuner. Neither is adequate. You ca
/archives//html/Amps/2006-03/msg00646.html (18,054 bytes)

174. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 24 Mar 2006 15:20:54 -0500
You can look in Bill Orr's handbook and he says you need 13 pf/meter of capacitance at the cathode for proper operation. That's 1040pf on 80 meters. Then figure out what L network values are needed
/archives//html/Amps/2006-03/msg00647.html (10,593 bytes)

175. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 24 Mar 2006 15:43:08 -0500
Yes Roger, I think the small tuner is a great idea also but with an L network you are limited to a specific value of L and C that you can use in order to get a match. The Q is fixed and can not be c
/archives//html/Amps/2006-03/msg00649.html (10,458 bytes)

176. Re: [Amps] Need some 220K 2 watt carbon resistors (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 26 Mar 2006 21:54:50 -0500
Hi Chris, If you are using them for cap equalizers in a power supply I would use metal film resistors instead. The carbon resistors drastically change value. 73 Gary K4FMX ___________________________
/archives//html/Amps/2006-03/msg00678.html (8,393 bytes)

177. Re: [Amps] HP 3336B (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 30 Mar 2006 23:35:38 -0500
Hi Will, I don't know much about the 3336B other than I see it listed in the old HP catalog along with the 3586C. I believe it can be slaved to the 3586. It looks like a very precise synthesizer alt
/archives//html/Amps/2006-03/msg00792.html (10,237 bytes)

178. Re: [Amps] The ongoing 4CX250B verbage! (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Tue, 4 Apr 2006 12:48:04 -0400
I wish all would stay with your convention (the proper way) of dB below a single tone of two tones when expressing IMD. :>) After all, even if you note that the IMD figure is below PEP, it is still
/archives//html/Amps/2006-04/msg00045.html (8,776 bytes)

179. Re: [Amps] small signal diodes (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Wed, 5 Apr 2006 11:21:20 -0400
1N5711 if I remember right, are the ones some have used in the 8405 probes. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
/archives//html/Amps/2006-04/msg00080.html (7,869 bytes)

180. Re: [Amps] AM Downward Modulation (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 13 Apr 2006 22:20:20 -0400
Some radios have the alc active on AM and allow you to set the carrier higher than the 25% level. As the peaks reach the 100 watt mark the alc reduces the gain which reduces the carrier level and you
/archives//html/Amps/2006-04/msg00238.html (9,370 bytes)

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