Steve, Thanks for your further input but, I do not think I have any accessory
sockets! Being a quite early TR4 it has the whole of 10m with three crystals.
I believe later models only came with part of 10m as standard. The only
crystals I have not removed are for 28.5 to 29.1 and 29.1 to
Damien,
Its not uncommon for the crystals to drift or not oscillate at all. If after
you accomplish the oscillator adjustment per the alignment instructions and any
of the 10 meter band positions show no negative voltage at the test point, the
crystal is bad. You sometimes can try and adjust
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