[AMRadio] BC-348-R HFO Cover Needed


Ray Smith rrs4 at sti.net
Sat Feb 13 15:30:59 EST 2010


Jim,

You are correct about the grid cap on the 6K7.  The person that changed the 
6K7 to a 6AC7 was looking for higher front-end gain.  To get it, he 
installed a shielded wire from the coil selector box through a hole in the 
small chassis plate next to the first RF socket, and from there to the G1 
pin on the socket.

Ray

----- Original Message ----- 
From: "Jim Tonne" <tonne at comcast.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>; <ne1s at securespeed.us>
Sent: Tuesday, February 09, 2010 7:42 AM
Subject: Re: [AMRadio] BC-348-R HFO Cover Needed


>
>
>
>>  the 6AC7 (9000 umhos) instead.
>> Either one far outshines the 6K7 with a
>> transconductance of 1650 umhos.  I
>>  think I have a 6K7 around, and it would
>>  be interesting to compare
>
> I think the 6K7 has a grid cap on top of
> the tube but the other tubes mentioned
> don't.
>
> - Jim W4ENE
>
>
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