Re: SX-110 2nd IF Circuit Design
¿ªÔÆÌåÓýJacques ?and the gang Do you/we believe that an early version of the schematic was much the same as later versions BUT the old drawing was in error by calling the 7H7 a Limiter, when all the time it was an IF amp? don ? From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Sunday, October 30, 2022 4:55 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-110 2nd IF Circuit Design ? Hi all, ? There is no 6SC7 in the SX-42. The tubes used are (from the 89D257 latest schematic). ? 1st RF and 2nd RF: 6AG5 Local Oscillator & Mixer: 7F8 1st IF: 6SK7 2nd IF: 6SG7 3rd 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 ? 73, Jacques, VE2JFE in Montreal ? 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 _._,_._,_ |
don Root