[Hallicrafters] SX-28 sensitivity on 10-15 meters?

[jackiv at juno.com]

use a 717A for the 6SK7 and a 6SB7 for The  6SA7?? then use a 300 ohm
from 75 ohm TV balun 
at the antenna if you are using co-ax feed

jack

On Mon, 17 Mar 2003 10:01:55 -0500 Roy Morgan <roy.morgan at nist.gov>
writes:
> At 10:01 PM 3/14/03 -0800, you wrote:
> 
> >All:
> >
> >Just wanted to know how the SX-28 fairs on 10 and 15 meters?
> 
> Not so good.
> 
> >I suspect low sensitivity. Is this true?
> 
> Yes, the thing is prettey deaf on the upper frequencies.
> 
> >  What are ways to "lessen" the deafness?
> 
> Substitute a different for the mixer or RF amplifier then do an 
> alignment. 
> Sorry, I can't find the notes I have on that substitution but it is 
> 
> something like using a 6SR7 for a 6SK7 or a 6SH7 for a 6SA7 or some 
> 
> such.  The tube you are looking for is moderately uncommon but 
> apparently 
> works much better than the one normally used.  Other list members 
> may have 
> the info.
> 
> In any case, the following should all be done:
> 1) replace all, repeat all, paper capacitors in the radio
> 2) replace all resistors that have drifted high in value
> 3) do a complete alignment
> 4) do the alignment again
> 
> Roy
> 
> 
> >  Thanks. Cal, N6KYR.
> >
> >
> >
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