[Milsurplus] Ideas on Japanese circuit ?

[Tom B]

Hi Ray,


Here is a simplified version of the schematic.


Tom



On 7/10/2023 9:49 PM, Ray Fantini wrote:
>
> Looked at that schematic for a bit and it can drive you up the wall 
> beyond a point, correct me if I am wrong but it looks like there are 
> two RF stages followed by a mixer and separate HFO then two stages of 
> IF and what I would suspect a grid leak detector in the final IF tube. 
> The mind blowing part is the mixer tube also has a triode used as a 
> audio driver that feeds a push pull audio output pair of triodes with 
> one in each RF amplifier all transformer couppled, cannot explain the 
> two remaining triodes in the first IF and HFO, one has to be a BFO 
> oscillator but no clue witch and what the other is doing?
>
> Ray F/KA3EKH
>
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