[HBR] questions about HBR-11

[N2EY at aol.com]

In a message dated 11/18/04 4:35:45 PM Eastern Standard Time, 
waltah at earthlink.net writes:


> Boy, the HB-67 uses a rare tube.  The 6T9 is one of those 10-pin 9-
> pin tubes, isn't it?  Has anyone *ever* seen the socket one of those 
> things?
>    
> 

Oh yes. It's a 12 pin Compactron. 

While not an exact replacement, I think a 6AQ5 is a pretty close match for 
the power pentode side. The triode might be replaced by a 6AT6, with some 
redesign. 

IIRC the 6T9 is used in the audio section so it's not that much of a job to 
redesign it slightly to use available tubes.

73 de Jim, N2EY