[Amps] Soft 572b's

[Gudguyham at aol.com]

In a message dated 11/22/2007 1:00:38 A.M. Eastern Standard Time,  
sub1 at rogerhalstead.com writes:


My  question is that the amp tunes up fine on all frequencies
> ( including  WARC) up to about 26 MHZ but will not amplify 10 meter
> frequencies at  all. The amp does have the 10 meter mod and I have
> changed the coil  tap back to the 10 meter position


There is a filter that grounds the input at the 27-30 mhz freq.  The  filter 
needs to be by-passed.  This filter is sometimes NOT shown on the  schematic.  
It is a small PC board about 1" square with a toroid coil and a  couple caps 
on it.  Bypass that or remove it and you'll be good to go on 10  meters, also 
be sure the bandswitch mod has been done.  You sometimes need  to advance the 
stop on the bandswitch and tap the coil for 10 meters as  well.  Good Luck



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