Kevin -
Your radio is a Version 2, probably built mid 1966.
Drake switched from 12BA6 to 6BA6 in Version 5, (4/68,) and to 6BZ6 in
Version 6, (10/68,) at V5.
12BA6 to 12BZ6 in Version 4, (9/67,) and to 6BZ6 in Version 5, (4/68,)
at V11.
V12 and V15 were 12BA6's for the entire production.
Kevin,
You will likely find that the schematic you have in your manual probably
doesn't match the rig you have. Also, the manuals changed slowly, if at all,
during the life, only the schematics changed. Garey will have all the
schematics in the CD. One question though, why would you want to "
While I wait for my repair CDs to arrive I have found something I need some
information on. I am in the process of retubing the TR4 I have and I went down
the list of tubes in the voltage chart and ordered all of the tubes. That I
think is my first mistake because when I took the cover off and
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