Hi Jacques, last reply tonight

Ok Ill try. I guess I must be getting cranky!

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I followed this case more or less since Emanuele posted it, so be kind if I misunderstood anything about.

I remember that Emanuele complained about a complete loss of sensitivity in the lower part of the Bands 1 and 2: is it right ? ???yes

Does somebody already asked him to check the amplitude of the Local Oscillator at the low end of those two bands ??? ??don’t think so

My doubt is: this seems to be an alignment problem, yes ?but what will be the effect of a “dying” LO on the low end of the BC band, for example ? I don’t know

That can happen if the Q of the oscillator coils is lower than they should be, or if the 6SA7 is end-of-life (not enough gain).

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FYI He said the LO aligned well on all bands, the RF and mixer tanks align and work well on band 3,4 ??but the RF and mixer tanks ?of 1,2 don’t align apparent too much mmFd at minimum.?? He has an impedance sweeper of some sort, and they show resonance too low, say 1200 kc not 1400 but don’t quote me.?

I was trying to get him ?to sweep at 600kc dial position, because if that if way off no little trimmer will help. Im sure he did a lot before posting and knows a lot.

I felt that it is a common mode problem ?all four tanks, but ?if so it has not been found. ???If the LO was weak, wouldn’t it show up first on band 4? … a question.

But your though may well be IT.? I don’t know how he did the sweeps but I would think they would be independent of the LO, mystery continues< I quit for now. Please fix my spellink ??I’m too tired.

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