[HBR] Another Receiver Project -- HBR-4, Part 9

[N2EY at aol.com]

In a message dated 8/15/04 12:22:01 PM Eastern Daylight Time, 
waltah at earthlink.net writes:


> A Butler circuit 
> (which is just a cathode coupled multivibrator with a series mode 
> crystal between the cathodes) will *always* work right off.   The 
> others seem generally to take some tinkering to get working.   
> 

Well, I've always had good (overtone) luck with the classic circuit in the CW 
Crystals flyer, whether I used a 6U8 triode or half a 12AX7 (as in the 
HW-101). Same circuit will work with fundamentals as well.

Nowadays (Type 7) I use all fundamentals, using a 6AU6A or 6CB6 in the 
grid-plate circuit, Shamelessly copied from the "Sideband Package" article. This 
circuit can multiply in the plate circuit, too. Oodles of output and easy on the 
rock if the screen voltage is low (I use 75-150 volts).

73 de Jim, N2EY