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Re: [Amps] QRO 2500DX MARK lll 4CX800

To: AMPS <>
Subject: Re: [Amps] QRO 2500DX MARK lll 4CX800
From: Alek Petkovic <>
Date: Sun, 31 Mar 2019 06:00:11 +0800
List-post: <>
Same thing happened with a Russian GU84B tetrode in the Emtron DX-2SP, at my local radio club. The resistive cathode to grid connection only becomes evident as the valve heats up. Strange.

73, Alek. VK6APK

On 30/03/2019 4:37 AM, Bob Gibson via Amps wrote:
After sending all three tubes down to be checked at D&C Electronics all three 
tubes came back bad..the test showed..that once the tube comes up to operating 
temperature there is a resistive cathode to grid short present possibly indicating 
a warped grid or screen.. My question is why would all three come back the same..I 
knew one tube was bad but to have all tubes test the same was a little odd..Anyone 
have any ideas..Bob W5RG

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