Quote:
Originally Posted by jr_tech
Not necessarily, I have also seen a "cost effective" addition of an additional IF amp stage without adding another IF transformer, by simply RC coupling two tubes together between two transformers. IIRC, this trick was also used on some Philco models, causing some confusion as to the number of *actual* IF stages in the radio, similar to the confusion caused by adding a RF stage *without* using a 3 gang tuning capacitor. Check the schematics to be sure, especially on 40s-50s Philcos.
jr
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The first generation "hippo radios" used the same RF stage. The later ones used two IF stages instead and a 14AF7 osc mixer tube.
I have to consult the schematic again! I don't remember if it had another IF transformer. I know, a lot of companies didn't, just the RC coupling.
I have an Emerson that has four 6BJ6's, one for the osc, one for the mixer and two for the two IF's, RC coupled.
