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141. [Amps] Initial RF testing of 4CX1000A amplifier (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Mon, 04 Nov 2013 21:40:48 -0800
After fixing various stupid mistakes (including mislabeling input and output connectors -- really!) I applied some RF drive to my new amplifier for the first time tonight. In order to stay out of tro
/archives//html/Amps/2013-11/msg00045.html (7,199 bytes)

142. Re: [Amps] Initial RF testing of 4CX1000A amplifier (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Mon, 4 Nov 2013 22:22:58 -0800
Forgot to add that screen voltage was 325, tightly regulated by GM3SEK tetrode board. Vic _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
/archives//html/Amps/2013-11/msg00046.html (7,888 bytes)

143. Re: [Amps] TL922 on 12/17 (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 5 Nov 2013 04:50:28 -0800
I have one which I use on those bands, with some nervousness. Power output is about 900-1000 w CW instead of 1200-1300 I get on other bands. FWIW this amp has grids directly grounded. Vic k2vco _____
/archives//html/Amps/2013-11/msg00048.html (7,378 bytes)

144. Re: [Amps] Initial RF testing of 4CX1000A amplifier (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Tue, 05 Nov 2013 08:34:11 -0800
My meter reads -10 - 0 - 40. Actually it is a normal meter with a new scale. There is a 10 mA bleed which brings the pointer to zero when there is no screen current. Very clever idea by GM3SEK. I'll
/archives//html/Amps/2013-11/msg00054.html (8,186 bytes)

145. Re: [Amps] where to begin (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 07 Nov 2013 08:37:31 -0800
I found this article <http://www.granta.g4axx.com/linear.php3> provides extremely helpful information about designing and constructing a tetrode amplifier. On 11/7/2013 7:47 AM, Carl wrote: While the
/archives//html/Amps/2013-11/msg00106.html (11,424 bytes)

146. [Amps] Question for the tetrode experts (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 07 Nov 2013 15:14:29 -0800
I've finally applied full drive to my 4CX1000A amplifier. Here is what I'm seeing: I have tried two tubes, both pulls. In one case I can run about 1kW out, and with the other, maybe 1200. What happen
/archives//html/Amps/2013-11/msg00123.html (7,607 bytes)

147. Re: [Amps] Question for the tetrode experts (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 07 Nov 2013 16:59:51 -0800
Gerald, I have only tested so far on 40 meters. There are no fixed capacitors in the tank on this band...but there is a ferrite choke across the output. I'll check to see if the choke is heating. I d
/archives//html/Amps/2013-11/msg00131.html (9,540 bytes)

148. Re: [Amps] Question for the tetrode experts (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 08 Nov 2013 10:37:08 -0800
Thanks to everyone for your responses. Here are the answers to all of the questions, plus latest results. The band is 40 meters. There are no padder capacitors in the circuit on this band. There was
/archives//html/Amps/2013-11/msg00150.html (11,754 bytes)

149. Re: [Amps] Question for the tetrode experts (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 08 Nov 2013 13:09:18 -0800
I have a vernier on it. Maybe I exaggerated -- it's not all that bad, just different. It is smooth. I just need to get used to it. A plus: the screen meter is very useful as a tuning indicator! None
/archives//html/Amps/2013-11/msg00155.html (10,304 bytes)

150. Re: [Amps] Question for the tetrode experts (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 08 Nov 2013 14:53:13 -0800
Q should be about 12. I have discovered that the screen meter is the tuning indicator. I have my trip point set at 35 mA, so I have so far kept it at 25-30 mA. I have still only tried it on 40M. I'm
/archives//html/Amps/2013-11/msg00162.html (12,696 bytes)

151. [Amps] Alpha chimneys (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 08 Nov 2013 15:02:41 -0800
Can someone tell me how Alpha and others that use silicone rubber chimneys on the tubes deal with the tops of the chimneys? Do they just butt up against a perforated section of the top cover, do they
/archives//html/Amps/2013-11/msg00163.html (7,226 bytes)

152. Re: [Amps] Question for the tetrode experts (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 08 Nov 2013 15:07:23 -0800
Maybe I'll learn more when I try it on other bands. I think California is less interesting these days than you may believe! OK, on 40 you have 375mA or so of RF current in the choke. My suspicion was
/archives//html/Amps/2013-11/msg00165.html (8,819 bytes)

153. [Amps] Screen current problem solved! (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sat, 09 Nov 2013 08:19:22 -0800
Yesterday I reported that the screen current of my 4CX1000A was dropping when the key was down for more than 10 seconds or so. Several of you suggested that some component in the tank circuit or scre
/archives//html/Amps/2013-11/msg00175.html (7,023 bytes)

154. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sun, 10 Nov 2013 08:08:27 -0800
Interesting point about the 'speedup' circuit. I am using a vacuum relay in series with a reed relay in a circuit similar to the Measures circuit. The voltage across the relays is normal when measure
/archives//html/Amps/2013-11/msg00214.html (14,834 bytes)

155. [Amps] Chinese 4CX1000A from Alpha (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 15 Nov 2013 08:33:53 -0800
I wasn't entirely happy with the behavior of 4CX1000A pulls, so I decided to bite the bullet and try a new tube. So much for my 'cheap' amplifier project (you hot rod guys understand the phenomenon o
/archives//html/Amps/2013-11/msg00343.html (7,465 bytes)

156. Re: [Amps] Chinese 4CX1000A from Alpha (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 15 Nov 2013 16:27:32 -0800
According to the data sheets, they are very different. The 1500B has a special grid structure that produces a very low level of IMD, if you operate them according to the parameters on the data sheet
/archives//html/Amps/2013-11/msg00349.html (9,768 bytes)

157. Re: [Amps] Chinese 4CX1000A from Alpha (score: 1)
Author: "Vic, K2VCO" <k2vco.vic@gmail.com>
Date: Sat, 16 Nov 2013 08:15:25 -0800
I didn't intend to criticize Alpha. Alpha said they were "interchangeable in these amplifiers" which is reasonable if they are running lower screen voltage. Since they are using two tubes, the lower
/archives//html/Amps/2013-11/msg00353.html (9,419 bytes)

158. Re: [Amps] Commander HF-1250 problem (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Mon, 18 Nov 2013 21:09:06 -0800
Bad connection at the plug on the line cord? If there is a terminal strip for 120/240 setup, a screw could be loose. Check the easy stuff first! On 11/18/2013 8:57 PM, doug ferguson wrote: Hi, My HF-
/archives//html/Amps/2013-11/msg00367.html (8,471 bytes)

159. [Amps] Fan sounds like F-15 (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 21 Nov 2013 08:32:54 -0800
I've been using my new 4CX1000A amplifier for a few days. It works great. But there is one problem that I need to solve: the fan -- it's a flat centrifugal type -- here's a construction photo from my
/archives//html/Amps/2013-11/msg00406.html (8,060 bytes)

160. Re: [Amps]  negative screen current (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Mon, 30 Dec 2013 16:44:34 -0800
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2013-12/msg00205.html (8,123 bytes)

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