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
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
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
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
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 ____________________________
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
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
Hello Steve, http://projectx-docdb.fnal.gov/cgi-bin/RetrieveFile?docid=853&filename=RaabHEPA.pdf&version=1 -- Best regards, Chris mailto:chris@chriswilson.tv _________________________________________
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
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 _____
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
Hello K5AM, What an elegant machine, lovely! :) -- Best regards, Chris mailto:chris@chriswilson.tv _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
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
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@
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
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
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
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
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
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