1/2 12BH7??
On Saturday, January 23, 2016 at 6:23:51 PM UTC-5, Patrick Turner wrote:
On Tuesday, 19 January 2016 05:52:28 UTC+11, wrote:
Hello!
Which tube is equivalent to 1/2 12BH7?
Mr Wieck typed....
"The standard equivalent in use today is the 12AU7, with perhaps a little bit less gain on the latter.
There are those who find that they are indistinguishable as drivers in low-power amps, favoring the 12BH7 over the 12AU in higher-power amps."
Just who says the 12AU7 "the standard equivalent" to 12BH7? The 12BH7 has a much lower Ra and higher Gm, and although both BH7 and AU7 are able to be used in the same audio circuit along with 6CG7, the BH7 has a significantly higher Ea swing because the Ra curve for EG1=0 is a more vertical line than in the AU7 or CG7.
Snippage:
Patrick Turner.
Two people on our little block are instrument amp types.
Explains much.
Peter Wieck
Melrose Park, PA
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