[R-390] Mixer Tube Substitution

[Perry Sandeen]

List,

Has anyone substituted the 6BY6 pentagrid mixer for the 6BE6 in either one or both of the SP 600?  If so, what were your results?

The 6BY6 had about three times the trans-conductance of the 6BE6 according to my RCA tube manual which implies that it would have better performance just as it has proven to be the case by replacing the 6BA6 RF amplifier tubes with the 6BZ6 types.

Also Hallicrafters used it in their receivers and Blakeslee used it in his SP 600 conversion article.

Regards,

Perrier