Wurlitzer 140B transistor part numbers?

Started by David68, March 26, 2022, 04:05:25 PM

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I was wondering if anyone knew the generic replacement part numbers for TR68-73 in a 140B amp.

I could order them online, but I have plenty of MPSA18, MPSA06,2N3391A,BC550B/C etc... transistors in my parts drawers. Seems unnecessary to order what I might already have.

Alan Lenhoff

Some years ago, I rebuilt my 140B amp, replacing all the original small signal transistors with lower noise MPSA18 transistors. The MPSA18s were recommended to me by a leading EP tech. They do the job perfectly.

For the record, I have the second version of the 140B amp, which started with piano serial number 29091. I don't know whether it would make any difference if you have the earlier version of the amp.

Co-author, "Classic Keys: Keyboard Sounds That Launched Rock Music"

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1965 UK Vox Continental;1967 Gibson G101 organ; 1954 Hammond B2; Leslie 21H; Leslie 31H; 1974 Rhodes Mark I Stage 73; 1972 Rhodes Sparkletop Piano Bass; 1978 Hohner Clavinet D6; 1968 Hohner Pianet N II; 1966 Wurlitzer 140B; 1980 Moog Minimoog Model D; 1983 Roland JX-3P; 1977 Fender Twin Reverb; 1983 Roland JX-3P synth; Vox AC30CC2X amp.
(See the collection: https://vintagerockkeyboards.com/ )