Many forget the sweep tubes were used as the horizontal output tubes in TV
sets. They ran hours at max conditions. Unfortunately when they are used
in ham sets, the ability to exceed the grid and plate currents when tuning
gave these fine devices a bad wrap. If you follow the book and tune as
as
I've always questioned Drake's decision to use the 6HF5 in that
transmitter. Sweep tubes made some sense for SSB at the time, but a CW
transmitter meant for beginners? A 6146 would have been so much more
forgiving and reliable.
73 de W3NU
On 3/21/2013 1341, Curt Gidding wrote:
The manual su
The manual suggests that the final 6HF5 be replaced with the same manufacturer
tube as
is in the xmtr. How critical is this? Is there one manufacturer that is
better? Tnx for your
reply.
Curt Gidding KC9UNL
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