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Forum 141

Interesting old thread about Tetrode and Pentodes

General Technical Discussion

Last Post by Sundog 2 years ago

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Nuvistor

(@nuvistor)

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Looking through an older section of the forum I came across this interesting thread. I have not read it all yet but will be sitting down with a cup of tea to enjoy it. Other types of valves are discussed all by knowledgeable members.

https://www.radios-tv.co.uk/community/radio/beam-tetrodes-vs-pentodes/

Frank

Posted : 21/10/2020 8:30 am

Till Eulenspiegel

(@till)

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There was a discussion on the other forum about the PL36 and PL81 line output valves. Very early production PL81s were pentodes but later on the valve was redesigned as a beam tetrode. The PL36 has always been a beam tetrode.

Till Eulenspiegel.

Posted : 21/10/2020 8:53 am

Sundog

(@sundog)

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On the original thread one comment by Steve (Synchrodyne) registered with my memory:

I was under the impression that GEC-MOV developed the kinkless tetrode with aligned grids, etc., but assigned initial manufacturing rights to RCA because it though that the precision required was beyond its immediate capability.

Yet I believe they did end op manufacturing them.

Anyway, that thread is a very good read.

Posted : 16/12/2021 8:26 pm