[Heath] SB-200 findings.

[Kenneth G. Gordon]

On 5 Jan 2012 at 19:31, J.D. MacAulay, WQ8U wrote:

> I understand that the input impedance of the SB-200 changes as the
> plate circuit is loaded.

That is true of any amp. Furthermore, as the amp tubes age and get 
weaker, the impedance changes yet again.

> Did you do your measurements and adjustments
> with the plate fully loaded?

I have. I can't answer for Peter though, but I imagine he did. I 
think our different results are due to different antennas and tuners.

Ken W7EKB