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

Total 314 documents matching your query.

121. Re: [Amps] Pi-L Network (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 29 Mar 2007 12:54:10 +0200
Hi Tom, The output impedance of the tubes are 1000-1500/3000 respectively. The corresponding mid impedances are 600-800/1200 ohms. Yes, I avoid that on my bandswitched homebrew amps for the mentioned
/archives//html/Amps/2007-03/msg00389.html (9,554 bytes)

122. Re: [Amps] Pi-L network (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 29 Mar 2007 23:15:32 +0200
I also found out that decoupling of the coils does the trick. With a single coil layer and the loading cap simply tapped to it, it was much worse. The Racal TA1800 with a 4CX10000D in AB1 is 2-30 aut
/archives//html/Amps/2007-03/msg00395.html (8,936 bytes)

123. Re: [Amps]8877 blower requirement...TXN ! ?Now..Airflow sensing ? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 10 Apr 2007 01:21:12 +0200
What an effort instead using a simple microswitch in the airflow path There is nothing as simple and reliable as that. 73 Peter One simple method is a small fan, free to rotate in the air stream. An
/archives//html/Amps/2007-04/msg00041.html (7,575 bytes)

124. Re: [Amps]8877 blower requirement...TXN ! ?Now..Airflow sensing ? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 10 Apr 2007 17:16:52 +0200
Hi Peter, The microswitches with the built on lever arm are very sensitive, it only needs a small blade fixed to the end of it. The switches are activated already with a small blow from ones lips. 73
/archives//html/Amps/2007-04/msg00055.html (8,598 bytes)

125. Re: [Amps]8877 blower requirement...TXN ! Now..Airflow sensing ? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 10 Apr 2007 23:23:47 +0200
I use Marquardt switches, model 1040.0114 at 0,12 Euro http://www.eas-y.de/scripts/upk/upkweb.dll/eas/start2?tranid=302423902 Factory homepage: http://www.marquardt.de The vane made of thin sheet met
/archives//html/Amps/2007-04/msg00068.html (9,009 bytes)

126. Re: [Amps] Triode vs Tetrode Amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 26 Apr 2007 21:19:47 +0200
What tetrode people do you think of? The tetrodes in Europe are specifified commercially and are typically -50db down or better on 3rd order IMD. 73 Peter 2.) The tetrodes, when we cut through the ad
/archives//html/Amps/2007-04/msg00325.html (7,402 bytes)

127. Re: [Amps] 2m W6PO input T network tuning. (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 28 Apr 2007 00:14:20 +0200
Hi Hugh. In to what impedance did you terminate the T-network when you did the test with the analyser? The cathode impedance of a triode in GG, your 8877, is depending on drive and grid current. So i
/archives//html/Amps/2007-04/msg00348.html (8,110 bytes)

128. Re: [Amps] W6PO 2m amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 10 May 2007 01:21:13 +0200
How could you that without powering it up? Did you use an artificial load from cathode to ground? 73 Peter Before I powered it up I tuned the input and output sections for minimum SWR at 144.1 MHz us
/archives//html/Amps/2007-05/msg00094.html (6,940 bytes)

129. Re: [Amps] Amps Digest, Vol 54, Issue 3 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 4 Jun 2007 12:17:01 +0200
They like it very much when high mu connected with all grids grounded. My L4B run a pair of them for more then 20 years without any trouble. I am using 4-400G by Amperex. 73 Peter mark, gongrats on t
/archives//html/Amps/2007-06/msg00024.html (7,480 bytes)

130. Re: [Amps] Re 200w fast relay (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 10 Jul 2007 19:10:44 +0200
Are you sure to talk about the S2 relay formerly manufactured by SDS? It works much longer at 1KW+ in TL922, SB-220s and L4Bs on qsk then the Jennings RJ1 vacuum relay before the contacts are gone. h
/archives//html/Amps/2007-07/msg00162.html (11,578 bytes)

131. Re: [Amps] wanted suitable blower for 8877 tube (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 19 Aug 2007 17:41:33 +0200
The G2E085 is much too small for a 8877 at 1500W dissipation, unless you run the tube qrpThe G2E108 is the right size to run it at half the voltage (and much less then half the noise) at normal qsos
/archives//html/Amps/2007-08/msg00124.html (10,310 bytes)

132. Re: [Amps] stability of amps (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 25 Sep 2007 05:53:04 +0200
That design has nothing to do with neutralization, there is none. It&acute;s just passive grid, I did that quite often with tetrodes and it always worked very well for me. 73 Peter --Original Message
/archives//html/Amps/2007-09/msg00245.html (9,018 bytes)

133. Re: [Amps] 4CX250 IMD (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 29 Sep 2007 15:31:05 +0200
4CX250B run quite well at 1500V anode voltage in the Racal TA1800 to drive the 4CX10000D. One 4CX350A works as a wide band pre driver, two in parallel are the tuned driver tubes. The amp is run with
/archives//html/Amps/2007-09/msg00475.html (9,333 bytes)

134. Re: [Amps] IMD (Some important useful corrections) (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 29 Sep 2007 17:06:40 +0200
True, but I did see that he wrote that his input measurement was not at key down (single tone) 73 Peter Now that we see how it works, if we look at the 490 watts and assume the meters were average or
/archives//html/Amps/2007-09/msg00479.html (9,644 bytes)

135. Re: [Amps] 4CX250 IMD (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 30 Sep 2007 15:00:18 +0200
That&acute;s the efficiency I always wanted to obtain! 73 Peter Input power is 500WDC, Output is 470W PEP, not key down CW. _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2007-09/msg00509.html (8,659 bytes)

136. Re: [Amps] 4CX250 IMD (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 30 Sep 2007 15:15:52 +0200
The spec sheet can be found here: http://www.g8wrb.org/data/Eimac/4CX250R.pdf SSB data is on page 2, at 470W output DC input is 750W, IMD -23db 73 Peter Input power is 500WDC, Output is 470W PEP, not
/archives//html/Amps/2007-09/msg00511.html (8,881 bytes)

137. Re: [Amps] Vacuum coax T/R relay (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 4 Oct 2007 21:27:52 +0200
I have a couple of Jennings vacuum coaxial relays, Actually those are transfer relays marked 2.5KW@30Mc. Those are equipped with N-connectors. I think I saw similar on the SSN webpage. 73 Peter Pat M
/archives//html/Amps/2007-10/msg00041.html (8,628 bytes)

138. Re: [Amps] Anyone build a GU5B? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 4 Oct 2007 22:55:32 +0200
Looks almost identical to the FTL3-1 RF heater-generator tube by BBC. The 80m monoband amp I built in the 70s with it had very poor 3rd order IMD, about -18db! Still good for CW and FSK, but not for
/archives//html/Amps/2007-10/msg00044.html (7,809 bytes)

139. Re: [Amps] Anyone build a GU5B? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 5 Oct 2007 20:43:36 +0200
They do quite well, a few are running also in Germany, Example loaded up: http://www.pbase.com/df3kv/gu81_at_friend 73 Peter --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounce
/archives//html/Amps/2007-10/msg00061.html (12,510 bytes)

140. Re: [Amps] CB Amps or full spectrum??? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Wed, 10 Oct 2007 17:57:50 +0200
It&acute;s no tube amp, but a 12V transistor amp where band passes are necessary 73 Peter I wondering about your comment about filtering. If you look at the tank circuit of these amps, you see a pi n
/archives//html/Amps/2007-10/msg00095.html (12,039 bytes)

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