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References: [ +from:df3kv@t-online.de: 314 ]

Total 314 documents matching your query.

181. Re: [Amps] Cathode Z GS35b (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 26 Jan 2009 20:39:29 +0100
This one is S= 25-40 mA/V according to the original data sheet. Driving impedance therefore is 25-40 ohms in GG 73 Peter Anyone have a fairly accurate figure on this? I read everything I can find- ha
/archives//html/Amps/2009-01/msg00307.html (9,000 bytes)

182. Re: [Amps] Plate Choke Values (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 5 Feb 2009 17:54:13 +0100
As you are already going to use vacuum variables you can put the choke after the roller inductor to the 50 ohm side. The anode variable and roller must withstand twice your anode voltage and the bloc
/archives//html/Amps/2009-02/msg00114.html (8,048 bytes)

183. Re: [Amps] SB-220's, 3-500's, some history (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 6 Feb 2009 21:44:49 +0100
The band switch of the SB-220 looks to me as one of a 100W transmitter from the 60s. 73 Peter Carl et al, not an adervetisment by any means.? What prompted this writing was the awareness of the insan
/archives//html/Amps/2009-02/msg00156.html (16,888 bytes)

184. Re: [Amps] SB-220's, 3-500's, some history (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 7 Feb 2009 12:45:38 +0100
Yes, something which did well at 100W AM (400W PEP) will do fine at 600-700W PEP if the antenna is low SWR and the tank properly tuned. The many toasted contacts clearly show its being on the edge. 7
/archives//html/Amps/2009-02/msg00171.html (22,299 bytes)

185. Re: [Amps] MFJ Analyzer for adjusting matching network... (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 21 Feb 2009 16:16:45 +0100
The plate load impedance depends roughly on the possible anode voltage swing, not supply voltage, and on the mode (conduction angle) the tube is biased for. The tube canīt be driven to zero volts on
/archives//html/Amps/2009-02/msg00609.html (8,233 bytes)

186. Re: [Amps] MFJ Analyzer for adjusting matching network... (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 21 Feb 2009 18:03:32 +0100
Hi Scott, I just entered the Eimac website, opened their library page and found it immediately: http://www.cpii.com/docs/related/22/AB5.pdf 73 Peter I have been Google searching for that tube perform
/archives//html/Amps/2009-02/msg00612.html (9,847 bytes)

187. Re: [Amps] 8122 op temp in NCL-2000 amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 14 Mar 2009 19:56:45 +0100
Hi Fern, Sure those are for use with grid driven AB1 tetrodes? 73 Peter Hi Frank: Your amp certainly looks like a perfect candidate to install an electronic vox biasing board to drop that needless hi
/archives//html/Amps/2009-03/msg00409.html (8,000 bytes)

188. Re: [Amps] 8122 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 15 Mar 2009 20:23:26 +0100
Hi Manfred, The 6146 (QE05/40) which is a beam power tetrode has 20W allowable dissipation in CCS service. According to my Valvo tube manual idle current at 750V is 12mA, that is 9W, almost 50% of di
/archives//html/Amps/2009-03/msg00429.html (7,853 bytes)

189. Re: [Amps] 4100VD 3CPX1500A7 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 19 Mar 2009 18:50:39 +0100
I donīt know anybody who managed to built a 10-160m amp with the YC-156 73 Peter Thats extremely easy to overcome with half the 10M coil before the Tune cap. Big commercial amps have been doing that
/archives//html/Amps/2009-03/msg00490.html (10,343 bytes)

190. Re: [Amps] Anyone ever used or owned a HLF-2500 Gates Amp? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 26 Mar 2009 17:19:26 +0100
Hi Jack, Yes I use one. I drive it with 50mW to full output. So far not any problem. Disadvantage is that bandchanges take longer then with a ham amplifier. Mine is sitting on one band most of the ti
/archives//html/Amps/2009-03/msg00514.html (8,032 bytes)

191. Re: [Amps] Plate voltage for GS35B (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 3 Apr 2009 20:19:43 +0200
If they hipot somewhere over 5KV but not to at least 9KV it will not work at 4.7KV. The tube will get the DC voltage + peak RF voltage on its anode. 73 Peter Ulf, I run 4200-4400 VDC on the plate wit
/archives//html/Amps/2009-04/msg00043.html (8,460 bytes)

192. Re: [Amps] Zero signal current 3CPX800A7 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 5 Apr 2009 05:57:35 +0200
Eimac claims 15mA at 2.2KV anode voltage and 40mA at 2.5KV per tube. Both with 8.2 zener diode in the cathode line. 73 Peter --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounce
/archives//html/Amps/2009-04/msg00052.html (9,203 bytes)

193. Re: [Amps] tank calculations - MFJ analizer - resistor (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 21 Apr 2009 18:18:09 +0200
The tube has to be in or you have to add its capacity parallel to the resistor. 73 Peter ok, quick question...(it'll be a poll) DO I leave the tube connected to the tank circuit and put on a 1/2w res
/archives//html/Amps/2009-04/msg00180.html (8,522 bytes)

194. Re: [Amps] High SWR (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 23 Apr 2009 21:24:52 +0200
I donīt care about VSWR as long it is less then 3 and my amp can tune into it. 73 Peter I think the importance VSWR in HF multiband operation lies somewhere in between extreme views. I need to know t
/archives//html/Amps/2009-04/msg00307.html (11,165 bytes)

195. Re: [Amps] Tank value problems and grid current (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 5 May 2009 15:36:41 +0200
To see 1.5KW output your anode current must be around 1.2A if you have 2100V on the plate. Your load Z will be about 1-1.2kOhm, so on 80m (3.5MHz) your coil should be about 5.7ĩH, not 3.7 and never 7
/archives//html/Amps/2009-05/msg00011.html (9,817 bytes)

196. Re: [Amps] Power Limits:M17/158 RG-142 (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Fri, 17 Jul 2009 21:18:20 +0200
On 50MHz it is specified at 3500W, 350W at 3GHz 73 Peter What are the Power limits on this cable. In particular at 50 MHz. ? I Googled it, but all those ..."request a quote"... joints drive me bonker
/archives//html/Amps/2009-07/msg00208.html (7,204 bytes)

197. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Mon, 20 Jul 2009 23:42:27 +0200
Donīt try that with the 4CX250B, it will loose its grid as soon it is driven 73 Peter Years ago we used to tie the screen and control grids together and ground them in 4-1000's. It was very stable bu
/archives//html/Amps/2009-07/msg00229.html (13,030 bytes)

198. Re: [Amps] Grounded Grid (Screen) 4CX250B power gain (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Tue, 21 Jul 2009 21:12:30 +0200
The Collins 30S1 is a good example were it is done with a 4CX250B style tube 73 Peter I dont believe there is any way to run a 4CX250 style tube in GG without destruction. Very few tetrodes have the
/archives//html/Amps/2009-07/msg00245.html (11,094 bytes)

199. Re: [Amps] inexpensive HV fuse (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Wed, 22 Jul 2009 18:55:38 +0200
I realized the 170 Joule crowbar for my 7.5KV HT supply with a string of thyristors, much more convinient then thyratrons and probably cheaper. 73 Peter resistor in the HT line between capacitor stac
/archives//html/Amps/2009-07/msg00278.html (8,699 bytes)

200. Re: [Amps] inexpensive HV fuse (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 23 Jul 2009 19:03:14 +0200
In one amp I use a Jennings vacuum contactor. They are cheap on Ebay from time to time. http://www.jenningstech.com/pdf/cont/rt1g.pdf http://www.surplussales.com/relays/REVacRel-7.html http://www.glv
/archives//html/Amps/2009-07/msg00309.html (11,647 bytes)

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