Effect of Tube shape?

debk · 2261

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Offline debk

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on: April 03, 2011, 03:21:08 PM
I am curious.  Looking at different 300b's and some other tubes, they are made with different shaped glass envelopes.

What effect does the envelope shape have on the tube?

Thanks

Debra

Debra K

Eros 2Phono amp
BeePre2, Psvane ACME 300b
Kaiju, Linlai Elite  300b
Monamour 2a3 amps various tubes
Sota Sapphire, Pete Riggle Woody Tonearm, Kiseki Purpleheart Cartridge
Rega P6 Ania Pro cartridge
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Offline 2wo

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Reply #1 on: April 03, 2011, 04:35:45 PM
I have globe mesh plate 300B and 45's. I think they look cool. There is some talk that the ST version of the 300B is slightly less microphoneic. the mica is smaller and slides into the straight sided top segment.  I have not had problems with mine...John     

John S.

Offline Doc B.

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Reply #2 on: April 03, 2011, 04:57:14 PM
Yeah, in general ST (shouldered) shaped envelopes have structural differences inside that should make the tube less microphonic. But you really have to smoke it and see.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

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