[R-390] Random tube sub of the day: 6AU6 for 6BA6

[Gord Hayward]

Hi Tim,
More stages than a 390A?
Yes, the 390 and the 392 have more in the IF.
Cheers de Gord, VE3EOS.

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Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.