[Collins] My 30L1's are so happy with 572B's
Yves Pautard
wn4i at access4less.net
Wed May 11 05:55:49 EDT 2005
DONT expect any more power from 572B's ( yes you still need 4 )
...I dont agree at all with you ...the 572B are the same as 811A's
execepted they can take 2700 volts or more and the plate is very strong
made of Graphit
You have nothing to do to use 572B's ...like I do since 1983 with no Problem
what's oever ......same plate current , same bias , same output because
the 30L1 can only supply about 1900-2000 VDC ...( with a good voltage
doubler power supply using BIGGER capacitors like in my in kit ...still
available )
They have been made to replace the fragile 811A's ....but also usable with
more plate voltage .....if you have a chance to use them on 2700-3000 Volts
amplifiers.
YES never move a 30L1 when it is ON .
Alway make sure the hot side ( BLACK wire ) of the power cord is going to
the tips of the fuse holders .....some ealier 30L1's comes reverse from the
factory. (DANGER)
You will never found any holes in the middle of the plates like in the
811-A's
73
Yves Wn4i...... wn4i at arrl.net
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