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Total 8 documents matching your query.

1. [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: Ken Harada <jo1vrk@hayama.net>; Date: Wed, 24 May 2023 21:20:11 +0900; Hi Amp enthusiasts, I am building a HF linear amp with 2 x 4CX350A with cathode driven circuit, but getting a strange symptom. Ep=2000V, Esg=300V (regulated with Zener and FET), Ecg=-50V to -20V (b; /archives//html/Amps/2023-05/msg00019.html (8,276 bytes)
2. Re: [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Wed, 24 May 2023 15:36:48 +0300; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2023-05/msg00020.html (7,532 bytes)
3. Re: [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Wed, 24 May 2023 15:39:13 +0300; Perhaps it's breaking into oscillation? 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ I am building a HF linear amp with 2 x 4CX350A with cathode driven circu; /archives//html/Amps/2023-05/msg00021.html (9,005 bytes)
4. Re: [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: Ken Harada <jo1vrk@hayama.net>; Date: Wed, 24 May 2023 21:42:08 +0900; Then my wiring is not good? But I don't hear noise on a receiver beside the amp - though I should watch different frequency to detect... 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5; /archives//html/Amps/2023-05/msg00022.html (9,678 bytes)
5. Re: [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Wed, 24 May 2023 15:51:23 +0300; Yes, it could be at VHF or even LF. 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.; /archives//html/Amps/2023-05/msg00023.html (9,887 bytes)
6. Re: [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: sm0aom--- via Amps <amps@contesting.com>; Date: Wed, 24 May 2023 19:59:02 +0200 (CEST); The 4CX350A is susceptible to grid emission, which can give very similar symptoms. This is due to the very small spacing between control grid and cathode, It the tubes are used, this becomes quite co; /archives//html/Amps/2023-05/msg00024.html (8,892 bytes)
7. Re: [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: Ken Harada <jo1vrk@hayama.net>; Date: Thu, 25 May 2023 19:51:21 +0900; I have placed a bleeder resistor to screen grid circuit. Should I do the same for control grid as well? Ken / JO1VRK It the tubes are used, this becomes quite common. One possible remedy is to use l; /archives//html/Amps/2023-05/msg00025.html (9,287 bytes)
8. Re: [Amps] 4CX350A Cathode Driven HF amp strange symptom (score: 1): Author: Ken Harada <jo1vrk@hayama.net>; Date: Tue, 10 Oct 2023 18:06:18 +0900; Hi, It was indeed an oscillation. I have then given up Ground Grid / Cathode driven circuit, and modified it to GK/Grid Driven with input load resistor. It works perfectly fine & stable, with drivi; /archives//html/Amps/2023-10/msg00026.html (10,179 bytes)

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