Stevem 1960: thanks for the response...your experience sounds like mine...I did some tube rolling, and sent email to Kevin Covi outlining my results. Here is copy of text sent to him:
"Tried RCA 45's: bigger, rounder, fuller...less focused than PX4's.
Tried Cunningham 45's: but had problem with right channel tube making really weird noises...this must have been my problem before, when I had the Korneff 45 mono amps in the system.
Tried Electro Harmonix 300b: nice. good bass, detail, vocals, better dynamics than PX4 or 45's.
Swapped TJ mesh plates from Welborne 300b's into Grange, and ran EH 300b's in Welborne monos: best yet...best vocals, detail, soundstaging, bass, dynamics etc. May have to pick up another pair at $279 pair new....
Don't know if I will swing the WE300b's...sure would like to try though..."
Based on the above, I went ahead and ordered another pair of TJ premium mesh plates...life is good...
"Tried RCA 45's: bigger, rounder, fuller...less focused than PX4's.
Tried Cunningham 45's: but had problem with right channel tube making really weird noises...this must have been my problem before, when I had the Korneff 45 mono amps in the system.
Tried Electro Harmonix 300b: nice. good bass, detail, vocals, better dynamics than PX4 or 45's.
Swapped TJ mesh plates from Welborne 300b's into Grange, and ran EH 300b's in Welborne monos: best yet...best vocals, detail, soundstaging, bass, dynamics etc. May have to pick up another pair at $279 pair new....
Don't know if I will swing the WE300b's...sure would like to try though..."
Based on the above, I went ahead and ordered another pair of TJ premium mesh plates...life is good...