[Boatanchors] SP-600

[TVComlGuy at aol.com]

Larry,
 
Have the caps been changed?
 
73//Ron, KB0WAR
 
 
In a message dated 8/4/2011 11:52:49 A.M. US Mountain Standard Time,  
telegrapher at q.com writes:

My  sp-600 started going south a few days abck.  Noticed some ringin when i 
 moved the tuning dial across the band rapidly.  I could hear what sounded  
like oscillations and ringing from the speaker.  I found that if i  smacked 
the main tuning dial it would quit.  hmmm.  Need a bigger  hammer maybe.  
then last night the audio got really scratchy and sounded  like it was off 
frequency.  This AM i went thru it and replace about 7  tubes that failed to 
meet specs.  Been a while since that has been done  evidently.  Now while the 
meter reads about the same, audio sounds like  they are using VOX to talk 
with even on SW stations.  And it's still a  bit scratchy even though signals 
are nice and loud.  

I did not  have 6BE6 tubes so used 5915 types instead.  One thing if ound 
is that in  the back left corner (viewed from the front) the 6BA6 marked on 
the chassis is  a 6AH6 in the socket.  The 12AU7 has a 12AT7 in it's place.  
I tried  the original chassis marked tubes but that didn't work so now i 
have new 6AH6  and 12AT7 tubes in those sockets.  I think they are there 
because of the  radio having been modified for SSb receiption.  Does anyone know 
if that  would have been done for a mod like this?  

All tubes now in the  radio test well above minimum levels according to the 
tube tester  charts.  Only thing i can think of that may have caused this 
were the two  6BE6 tubes and maybe the 5915 types, while the test settings 
are the same, may  indeed not be valid subs.  

I need some good 5750/6BE6  types.  Or even the GE 5Star rated 6BE6 would 
be nice.  I've pulled  some supposedly new RCA types and found that they 
wouldn't even meet  specs.  Same with 5750's from JAN  stock.

Comments?

Larry
W0OGH
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