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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 23rd Jul 2019, 7:42 am   #1
tubehead1
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Default VT-167 E1541 CV1716 Triode not 6K8

Hi I have some valves new in box that look like PX4 Triodes but they like the settings on my AVO VCM163 it overloads every time I test as a PX4, I cannot find any data whatsoever in relation to its use and its specs the boxes and tubes have have the following stamped on them GPO VT-167 and then in plain writing CV1716, they are beautifully constructed tubes, any information out there ?

https://www.radiomuseum.org/tubes/tube_cv1716.html

Thanks
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Old 23rd Jul 2019, 7:44 am   #2
tubehead1
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Default Re: VT-167 E1541 CV1716 Triode not 6K8

I meant they don't like PX4 settings Gm sits at 5 but Ia goes off scale and shuts down, I don't want to damage my AVO or the valves
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Old 23rd Jul 2019, 7:52 am   #3
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Default Re: VT-167 E1541 CV1716 Triode not 6K8

Data here:-

http://www.r-type.org/pdfs/cv1716.pdf
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Old 23rd Jul 2019, 9:10 am   #4
Mike. Watterson
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Default Re: VT-167 E1541 CV1716 Triode not 6K8

Use a more negative grid bias.
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Old 24th Jul 2019, 6:52 am   #5
tubehead1
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Default Re: VT-167 E1541 CV1716 Triode not 6K8

Thank you both, any idea of what they were used in ?
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Old 24th Jul 2019, 5:37 pm   #6
Mike. Watterson
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Default Re: VT-167 E1541 CV1716 Triode not 6K8

Telephone Trunk / inter-exchange amplifiers. Very long ago. Hence a GPO designation.
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