[ARC5] Audio stage impedances.

[Kenneth G. Gordon]

Thanks, Ian. Yes. I got my data from Frank's site. I use it regularly.

Audio amps and impedances have always flummoxed me. I have never 
spent the necessary time to educate myself about them.

Ken

On 23 Jan 2013 at 22:49, Ian Wilson wrote:

> The RCA data sheet for the 12A6 (available from Frank's
> amazing site, etc - http://www.tubedata.org ) has a handy
> chart at the end that shows power output and harmonic
> distortion versus the load seen by the tube.
> 
> The typical operating parameters in Class A fit fairly well
> with the rule-of-thumb for Class A amplifiers:
>   Rload =~ plate_V / (plate_I * 1.3)
> 
> Note that 'plate resistance' is the small-signal slope of plate
> voltage with respect to plate current, whereas the effective
> load resistance is a large signal parameter.
> 
> 73, ian K3IMW
> 



Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne