[heathkit] Heathkit SB400 low output

["Robin McNeill" <robin@venturesouthland.co.nz>]

Hi,

I am restoring a SB300/SB400 station (I live with solid state, but for
fun vacuum beats silicon any day). The trouble is that the SB300
(master) HFO oscillator doesn't like being connected to the S400 on 40m
and 20m. That's not quite true- the HFO refused to oscillate on 40m when
connected to the SB300, but after I tinkered with the coils, I now can
use the twins on 40m, but the 20m crystal now refuses to oscillate. I
haven't been able to reverse this. The other bands work fine- in fact I
have a bit of fun Dxing into Europe on 40m with the twins.

I have swapped the valve and I have swapped the crystals from the SB400
(where they go just fine) and without joy. The oscillator (TGTP) circuit
is so simple that it just can't not oscillate. Somebody, please point
out to me the very simple, very obvious, dumb thing I have overlooked.

73, Robin ZL4IG
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