Comments on: Do all 9-pin vacuum tubes for amplifiers have the same pin connections? http://audiograveyard.info/engineering/do-all-9-pin-vacuum-tubes-for-amplifiers-have-the-same-pin-connections All About vintage pro audio Tue, 07 Feb 2012 14:04:56 +0000 http://wordpress.org/?v=2.2.2 By: Technobuff http://audiograveyard.info/engineering/do-all-9-pin-vacuum-tubes-for-amplifiers-have-the-same-pin-connections#comment-459 Technobuff Mon, 01 Jun 2009 02:02:00 +0000 http://audiograveyard.info/engineering/do-all-9-pin-vacuum-tubes-for-amplifiers-have-the-same-pin-connections#comment-459 You want to improve the performance of an existing preamp circuit? I'm sure the manufacturer would have already optimised the circuit and values around a specific valve for the purpose it was intended for. No, pinouts and even number of elements in a valve varies, also internal element connections may be different or even non- existant. If you're lucky, the filaments may be wired the same. I seriously doubt you would gain anything trying to "re- invent the wheel". You want to improve the performance of an existing preamp circuit?
I’m sure the manufacturer would have already optimised the circuit and values around a specific valve for the purpose it was intended for.
No, pinouts and even number of elements in a valve varies, also internal element connections may be different or even non- existant.
If you’re lucky, the filaments may be wired the same.
I seriously doubt you would gain anything trying to “re- invent the wheel”.

]]> By: billrussell42 http://audiograveyard.info/engineering/do-all-9-pin-vacuum-tubes-for-amplifiers-have-the-same-pin-connections#comment-458 billrussell42 Thu, 28 May 2009 18:09:03 +0000 http://audiograveyard.info/engineering/do-all-9-pin-vacuum-tubes-for-amplifiers-have-the-same-pin-connections#comment-458 no. they vary. Similar tubes may share a common pinout, but you don't know for sure until you look up the datasheets on both. . no. they vary. Similar tubes may share a common pinout, but you don’t know for sure until you look up the datasheets on both.

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