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Antique Radio Technical Forum
Brunswick model 15 1930-31

Posted by nom on 04/02/2009 05:18

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:::: I can hear my signal generator coming in on a tuned frequency (signal generator and dial on radio match) with 2 of the tubes removed. That would be 1RF and 2RF removed. My signal generator hooked to a pin on 3RF.
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::::Now if I “HEARD” you right, you have the sig gen into the INPUT circuitry of the THIRD RF, therefore the 1st and 2nd wouldn’t
::::come into play, being in FRONT OF that RF signal flow path.
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::::How’s about leaving a “ to be evaluated” 24 in that 3rd RF slot and bring the mod RF from the signal generator down to a just
::::perceivable weak detected audio tone and lock that reference into your mindset and then sub in each of the other 24’s for a
::::warm-up and judgment against that initial criterion . (OR that of another 24 in that tube sequence , in case there was a
::::decided difference between a tubes amplification performance. . . . .2 tubes out of 3 should let you evaluate a norm.
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::::The e e e e e n you can phase in a 24 tube for the 2nd RF slot and move a greater attenuated RF signal input to that point and
::::eventually progress to the full 3 RF stages complement of the set, to see if there possibly are circuitry problems or alignment problems
::::in the frontal stages.
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:::Okay great! Thank You. I have 4 good 24's in now & I also I have my first actual reception of a
:::: transmitted station!
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:::Now I just need to be able to adjust the carrier freq., or IF, and do an alignment on this "OLD" gal and she will be back in service...do you have any tips on this proceedure?...nom
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::::73's de Edd

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::You can't adjust the carrier frequency, that is set by a crystal at the transmitter. i will try to find my book (which I haven't seen since I left radio about forty years ago) and see if I can help out.
::Lewis
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:Thank You Lewis...I have checked riders and bietmans and have got a good schematic and other data. But no alignment proceedure. I have 4 adjustment screws on the (my mind's gone blank) the thingy with the fins that you adjust for frequency. They appear to be lined up with the 1rf, 2rf, 3rf, and detector tubes. You can inject a signal into the antenna connection and tweak those 4 screws and get any frequency on the dial. But when you improve it on the high end you loose it on the low end. Thanks again for your interest...Neal

TUNER, there are 4 sections of the tuner. Each one has an adjustment bolt. By moving these adjustment bolts in or out you can tune to any frequency (between 550 and 1500kc) matching the dial with the signal generator. But if you tune them in for one frequency you loose your adjustment for the frequencys on the opposite end of the dial. It's got to be a matter of which ones are tuned when...Neal



Brunswick model 15 1930-31 
nom 03/31/2009 02:04 
Edd 03/31/2009 12:04 
nom 03/31/2009 16:31 
Lewis L 04/01/2009 11:11 
nom 04/02/2009 00:40 
nom 04/02/2009 05:18 
Edd 04/02/2009 16:44 
nom 04/03/2009 02:41 
nom 04/03/2009 09:55 
nom 04/04/2009 21:45 
Edd 04/10/2009 17:23 
nom 04/11/2009 22:24 
nom 04/16/2009 08:15 
nom 04/18/2009 22:40 
nom 04/19/2009 11:29 
nom 04/21/2009 03:52 
Lewis L 04/21/2009 13:42 
nom 04/22/2009 01:32 

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