[ARC5] "ARC-5" Market Value - It's Crazy

[Kenneth G. Gordon]

On 10 Aug 2015 at 17:52, Phillip Carpenter wrote:

> See: "Transistorized Q Multiplier", QST January 1958. Uses a CK768 PNP junction
> transistor (NTE100, 2N482, 2N309, 2N308).
> 
> Phillip

That's it. Thanks, Phillip.

One thing to remember about that circuit though, is that it uses "parallel" feed 
of the DC to the transistor. My friend tried to use a modern 10 mH choke 
there, and its "Q" was so high that the "Q" multiplier oscillated at something 
like 10 KHz instead of 455 KHz. He had to go to a series DC feed, and that 
fixed it.

He told me that in his RME-69, it works very well.

Ken W7EKB