Quote:
Originally Posted by dieseljeep
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.  |
Bingo! One of my "hippos" has the RC coupled IF stage... two 7B7s with a 16K plate resistor on the first, then a 220 pf cap to the 150K grid resistor of the second. I have actually used a similar scheme once or twice when I could not find a suitable replacement IF transformer for one with an open primary or secondary. I thought that was pretty sleazy, but it worked ok.
Talk about sleazy, looks like Emerson really got the tube count up on that model.
jr