Hello All,
Congratulations to Mark, N1VQW on his AC-4 Re-build (with the 'Soft Start') and
the subsequent comments by Garey, K4OAH and Dick, KE4NS. Etc. I rather like the
idea of a remote 'Switch Board'. As far as originality of equipment is
concerned could the relay have been mounted outboard in the Speaker Cabinet?
But then, how many of us have got fans mounted on the back of equipment PA
Cages?
The first thing that came to my notice was the reduction of 'Inrush Current',
at the switch; 365ma down to 10ma. This must mean longer life for the on/off
switch.
Although 'Inrush Current' did not seem to be considered a problem many years
ago (1950s and '60s) Orr mentions it in his Radio Handbook, 18th. Edition and
22nd Edition. His concern was the possibility of damage to the rectifier diodes
(18th. Ed. p781) and vacuum tubes (although this may have only applied to
thoriated-tungsten filaments) and rectifier stack (22nd. Ed. p 23.6 and 23.24).
Did Collins consider this a problem and if so what did Art do about it?
I wonder what else 'Inrush Current' could affect ?
I would appreciate any comments anyone would like to make on this topic. After
all we are dealing with quite old equipment and the more theoretical and
practical knowledge we have, the better (in my opinion).
Keep the Drakes on air.
Bob ZL2AAQ
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