Jeff:
Full/rich 12au7's in the Foreplay are:
RCA black plate (50's/60's)
RCA gray plate (50'/60's)
Sylvania BP (yellow print 50's/60's)
Sylvania GP (yellow print 50's/60's)
Still pretty full sounding, but with increased HF extension:
Amperex Orange Globe 12au7a/ecc82 (mine are really Mullards)
RCA 5814a white label (mine have 3 mica spacers)
GE's can also be good (nice & full), but they have been hit and miss from my collection (think the ones I like are actually RCA's branded GE).
Full/rich 12au7's in the Foreplay are:
RCA black plate (50's/60's)
RCA gray plate (50'/60's)
Sylvania BP (yellow print 50's/60's)
Sylvania GP (yellow print 50's/60's)
Still pretty full sounding, but with increased HF extension:
Amperex Orange Globe 12au7a/ecc82 (mine are really Mullards)
RCA 5814a white label (mine have 3 mica spacers)
GE's can also be good (nice & full), but they have been hit and miss from my collection (think the ones I like are actually RCA's branded GE).