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Audio and Video Talk
Valves / Vacuum Tubes
LF: RCA branded 6J5 and 76 valves
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<blockquote data-quote="kubusi" data-source="post: 825788" data-attributes="member: 19010"><p>Hi Charles,</p><p> the only difference I am aware of is the interelectrode capacitances of the all metal construction is marginally less than the GT version. This is according to the RCA tube manual as otherwise no differences are given. No mention is made of the glass ST12 shape, I have few examples I seem to think they date from the late 30's and early 40's before the GT shape came about, if there are any differences they did not indicate any at all nor with the 7A4 (loctal version of the 6J5) where the pins come straight out of the glass.</p><p>From a RF aspect the all metal version is superior as no external shielding is needed in critical circuits where there could be a problem otherwise.</p><p>Kubusi</p></blockquote><p></p>
[QUOTE="kubusi, post: 825788, member: 19010"] Hi Charles, the only difference I am aware of is the interelectrode capacitances of the all metal construction is marginally less than the GT version. This is according to the RCA tube manual as otherwise no differences are given. No mention is made of the glass ST12 shape, I have few examples I seem to think they date from the late 30's and early 40's before the GT shape came about, if there are any differences they did not indicate any at all nor with the 7A4 (loctal version of the 6J5) where the pins come straight out of the glass. From a RF aspect the all metal version is superior as no external shielding is needed in critical circuits where there could be a problem otherwise. Kubusi [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
LF: RCA branded 6J5 and 76 valves
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