[MrFixr55]

Hi Folks, 

7 Henry sounds to be way too much.  How many Henrys (Henries?) is a power supply filter choke, 30 maybe?  With a 7 H choke in series between the 1st AF and the interstage transformer, this thing is gonna have a frequency response of about 30-300Hz (yes, 300.)  I may be wrong in my guestimate here, and my college Physics II textbook is buried in the garage (archeological dig), but I have a VEC 1290K AM Transmitter kit, with a rather clever way of modulation.  The output of an LM386 is directly connected through a 1000 uH (micro-Henry) choke, to block the RF from the Audio Output, which is actually the B+ for the Transmitter final, hence the coupling only by a choke, no cap in series.  The Schematic is attached in case this whets someone's appetite).

So I think the choke should be in millihenries instead of Henries.  I don't think any harm would come by just trying the resistor, especially since this part is not in later sets (OK, it is in the 73A, but other sets that have push pull and interstage transformers, I think that this part eventually disappeared.  If it sounds horrible, then try to find the right inductance.  There is inductance to the transformer to begin with.


Maybe that 7 H choke will fix the ringing in my ears but the high frequency response of my hearing is bad enough!   Ms Fixer is always )!$$ed at me every time I ask her to repeat herself.

Best Regards, 

John,