On 2/7/2012 12:25 PM, David Forbes wrote:
On 2/7/12 11:29 AM, threeneurons wrote:
Almost any dual triode can be made into a flip-flop, so your 8 transistors
can fit into 4 bottles. Even a 7-pin 6J6 can work, since flip-flops generally
have common cathodes anyway.
Not really. Audio tubes fail in that application.
The computer tubes developed in the early 1950s by IBM and Remington-Rand solved
the problem of cathode poisoning that digital circuits excite in dual triodes.
You want the 5963 or 5965 as replacement for the 12AU7, or the 5964 as a
replacement for the 6J6. These digital tubes used to be cheap, until some seller
to audiophiles got the bright idea to claim that they have that warm tube sound.
Another dual triode that was common as dirt in computers was the 6211. It's
faster than the 5963. IBM bought millions of 'em from GE 50 to 55 years ago.
--
David Forbes, Tucson, AZ
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