Hi all,

?

There is no 6SC7 in the SX-42.

The tubes used are (from the 89D257 latest schematic).

?

1^st RF and 2^nd RF: 6AG5

Local Oscillator & Mixer: 7F8

1^st IF: 6SK7

2^nd IF: 6SG7

3^rd IF: 7H7

Limiter & AM detector: 7H7

Noise Limiter: 6H6

FM Discriminator: 6H6

BFO and S meter Amp: 7A4

Audio Inverter (phase splitter + driver): 6SL7

Audio Output: 2 x 6V6

?

?

Scott, and ?Steve and the gang:

I think Steve clarified a mistake re the sx-110 , but he listed IF tubes for others ?and never said anything about my comment on the sx-42 .

he listed?? “SX-42 (1947-50) 6SK7, 6SG7”?

?my? ?1996 Dachis ?book and my ?Osterman? book says ?6SK7,? 6SC7, 7H7

I also said “Wonder if we have the same printing…”

?

Now I wonder if ? my? ?1996 Dachis ?book and my ?Osterman[ second edition]? books ?are wrong ??about the 42

?

For the 62 you mentioned ?,Osterman ?lists the same IF tubes as it lists for the 42, [6SK7,? 6SC7, 7H7] and also says the A version seems to be the same except for the speaker impedance,, BUT Dachis says? 6SK7?6SG7?6SG7?

I guess I must be off-track, and/or cant read these details so maybe somebody else can check these books?

Don VA3DRL