I have made an interesting note on the FL2100B input swr VS.
tubes.!!!
I have been fighting this amp for a long time now using chinese
tubes and could never get the input swr down much below 2.5 :1.!!!On 10
mtrs. I had to add capacity to the input pi-net to get anywhere near
even 2:1. !!
I recently acquired a pair of Cetrons, ( 572B/T160L ) , which
I think was the tube originally used in that amp.
I tuned the inputs per the original instructions and lo and
behold, the inputs are almost all well below 1.5:1 swr. the only
exceptions are the high end of 80 ( 1.55:1) and the High end of 10 (
29.4 -29.7 , 1.45 :1 , !!!) I also had to remove the extra capacitance
I had added on 10.
I have to wonder now about the actual input capacitance of
the chinese tubes !!!!
what ever it was that caused the problems on 10 mtrs. I will soon
see if it has gone away.!!!!!
Has anyone else had problems with the 2100 on ten mtrs ??
Just wondering.!!!!
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