Gm for a good NOS 12SX7

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I have been looking out for a tube tester on ebay for a little while now. Well my Hickok 752A tube tester arrived today and as you can imagine I could not wait to test my 12SX7GT tubes that I have had for a few weeks now. It seems to work fine but I am new to tube electronics and I would appreciate a little help. The roll data states that the Gm should be no less than 400 but what should I be expecting to read for a NOS tube. I realise that the two triodes should match as closely as possible. Am I correct in thinking that V1, V2 and V4 would benifit more from triode matching than V2 would.
Many thanks
Roy

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Topic - Gm for a good NOS 12SX7 - Roy 14:26:22 04/25/02 (6)

Re: Gm for a good NOS 12SX7 - mark 16:26:17 04/25/02 (5)

Re: Gm for a good NOS 12SX7 - Roy 22:43:56 04/25/02 (4)

Re: Gm for a good NOS 12SX7 - Lew 06:20:51 04/26/02 (3)

Re: Gm for a good NOS 12SX7 - Al Sekela 13:49:40 04/26/02 (2)

Re: calibrating TV7D/U - Keith 09:47:10 04/28/02 (1)

Re: calibrating TV7D/U - Al Sekela 20:39:39 04/28/02 (0)

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