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References: [ +from:chris@chriswilson.tv: 129 ]

Total 129 documents matching your query.

101. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Sun, 11 Jun 2017 21:43:38 +0100
Hello Carl, I am beginning to build an LF amp using a GS35B tube, what do you reckon the HV limit is for a Pi coil wound on a toroid? At 136 kHz air wound coils start to get pretty big nd bulky.... T
/archives//html/Amps/2017-06/msg00171.html (8,230 bytes)

102. Re: [Amps] Real time tests to see if an RF transformer is saturating? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Mon, 12 Jun 2017 13:56:30 +0100
Hello Manfred, Thanks for clarifying that, I have the 20 turn winding with the grounded end coming out on the side of the core with no terminal pins and joining the 8 turn winding on the side with th
/archives//html/Amps/2017-06/msg00184.html (9,702 bytes)

103. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Tue, 13 Jun 2017 15:52:06 +0100
Hello Peter, Thanks for the photos of the LF tube amp, is there any more info on it available anywhere? My friend speaks fluent German if it's in that language. Just how conductive *IS* ferrite anywa
/archives//html/Amps/2017-06/msg00195.html (9,024 bytes)

104. Re: [Amps] Real time tests to see if an RF transformer is saturating? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 16 Jun 2017 12:44:43 +0100
Hello Manfred, Again I thank you for an incredibly detailed reply! Firstly, the "boxes". I used some die cast alloy boxes at picked up at a rally, I bought his whole stock, he was an ironmonger and u
/archives//html/Amps/2017-06/msg00213.html (21,918 bytes)

105. Re: [Amps] Plate coupling capacitor value (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 8 Sep 2017 08:50:09 +0100
Hello John, What value blocking cap would you suggest for a 136kHz amp I am building using a single GS35B tube? Thanks. -- Best regards, Chris mailto:chris@chriswilson.tv ____________________________
/archives//html/Amps/2017-09/msg00041.html (8,276 bytes)

106. Re: [Amps] Pole pigs removed from oil ?? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 3 Nov 2017 10:54:47 +0000
Hello Paul, You lot Stateside are very lucky being able to acquire these "pole pigs". Here in the UK I have never, ever found a source for them, or even found a linesman who knows what happens to old
/archives//html/Amps/2017-11/msg00008.html (8,836 bytes)

107. Re: [Amps] Amplifier for 630 meter band (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 10 Nov 2017 21:31:36 +0000
Hello Catherine, I run several W1VD design Class D MOSFET amps on LF (136kHz) and they perform really well. Most expensive item to source here in the UK is the LPF toroids, mainly di=ue to carriage f
/archives//html/Amps/2017-11/msg00108.html (11,267 bytes)

108. Re: [Amps] Low pass filters and saturated operation (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Tue, 2 Jan 2018 09:15:48 +0000
Hello Steve, http://projectx-docdb.fnal.gov/cgi-bin/RetrieveFile?docid=853&filename=RaabHEPA.pdf&version=1 -- Best regards, Chris mailto:chris@chriswilson.tv _________________________________________
/archives//html/Amps/2018-01/msg00012.html (8,988 bytes)

109. Re: [Amps] Low pass filters and saturated operation (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Tue, 2 Jan 2018 09:19:52 +0000
Hello Chris, and at: https://www.researchgate.net/publication/2980091_The_class_BD_high-efficiency_RF_power_amplifier You may need to pay as at IEEE if you aren't a member -- Best regards, Chris mail
/archives//html/Amps/2018-01/msg00013.html (8,332 bytes)

110. Re: [Amps] Narcissism everywhere (almost) (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Tue, 2 Jan 2018 18:13:14 +0000
Hello Robert, Amusing to see so many latter day Bertie Russells are alive and well and with call signs, to boot! Philosophers with gain.... ;) -- Best regards, Chris mailto:chris@chriswilson.tv _____
/archives//html/Amps/2018-01/msg00016.html (8,212 bytes)

111. Re: [Amps] Shipping a heavy HV Transformer (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Sun, 21 Jan 2018 20:26:40 +0000
Hello Ed, I know when I ship race engines to Australia I have to provide paperwork that the wooden crate is treated against God knows what infestations, Could it be some states have legislation about
/archives//html/Amps/2018-01/msg00126.html (8,619 bytes)

112. Re: [Amps] Series C in amp output (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 16 Feb 2018 14:37:23 +0000
Hello K5AM, What an elegant machine, lovely! :) -- Best regards, Chris mailto:chris@chriswilson.tv _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
/archives//html/Amps/2018-02/msg00035.html (10,763 bytes)

113. Re: [Amps] Rick Measures AG6K (SK) (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Sun, 18 Mar 2018 13:26:32 +0000
Hello Amp builders, I am saddened by this news, Rick was helpful to me on a number of occasions and patiently answered several queries. Condolences to his family and friends. -- Best regards, Chris m
/archives//html/Amps/2018-03/msg00054.html (8,176 bytes)

114. [Amps] 220 / 240 Volt filament transformer for 3CX3000 wanted (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 18 Jul 2018 15:09:09 +0100
18/07/2018 15:08 Anyone got a 220 / 240V filament transformer for a 3CX3000 for sale? I am in the UK but unable to source one here at the moment. Thanks. -- Best Regards, Chris Wilson. mailto: chris@
/archives//html/Amps/2018-07/msg00054.html (6,724 bytes)

115. Re: [Amps] 220 / 240 Volt filament transformer for 3CX3000 wanted (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 20 Jul 2018 18:01:50 +0100
Hello Chris, I believe I am sorted thanks. I have been pointed to a UK comany who can make a toroidal core one with 4 primary taps for voltage adjustment at £85 UK Sterling plus VAT at 20% Sounds pre
/archives//html/Amps/2018-07/msg00065.html (8,078 bytes)

116. [Amps] RX protection scheme, is this sound? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 12 Sep 2018 11:52:31 +0100
12/09/2018 11:42 RX protection sought for either a Kenwood TS-590 or a Red Pitaya functioning as an SDR for the LF 136kHz band. Change over relay box for the antenna has a 60 Amp automotive relay gro
/archives//html/Amps/2018-09/msg00011.html (7,397 bytes)

117. Re: [Amps] RX protection scheme, is this sound? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Mon, 17 Sep 2018 11:57:32 +0100
Hello Steve and Chris Hayes, thanks for the replies. I have gone for two ultra fast high power diodes in back to back with a festoon bulb of 5W at 12V in series before them. It was not practical to w
/archives//html/Amps/2018-09/msg00016.html (9,616 bytes)

118. Re: [Amps] Help with Henry Amp mechanical challenge (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 19 Oct 2018 22:25:02 +0100
Hello Amps, Thursday, October 18, 2018 They sound like Bristol splines, and are popular on older US equipment, some reckon the spline form is far more reliable than Torx or hexagon. I have some Colli
/archives//html/Amps/2018-10/msg00077.html (9,888 bytes)

119. Re: [Amps] Nylon in RF Tank Circuits (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Mon, 10 Jun 2019 11:59:02 +0100
Hello MU, Friday, June 7, 2019 Test it in a microwave oven? Best regards, Chris 2E0ILY mailto:chris@chriswilson.tv _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2019-06/msg00027.html (8,410 bytes)

120. Re: [Amps] Fwd: Re: Removing grid shorts (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Thu, 13 Jun 2019 00:30:44 +0100
Hello Alek, Wednesday, June 12, 2019 As an ornament it will still be as beautiful, but you may get lucky and it will return as a functional tube. nothing ventured.... ;) Best regards, Chris 2E0ILY ma
/archives//html/Amps/2019-06/msg00035.html (19,267 bytes)


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