Quote:
Originally Posted by bikerhifinut
Just a note on EF86, they are horribly expensive, even the Russian ones.
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I've found the 6BR7 is fully as good as the EF86, and generally much less pricey. Like the EF86, it was designed as a low-noise, low hum, low microphony preamp.
EF91s are great at RF but horrible as audio preamps - invariably noisy and microphonic.