[Amps] 813 efficiency

[Eddy Swynar]

On 2013-02-25, at 7:11 AM, Jim Thomson wrote:

> 
> On 2013-02-22, at 11:14 AM, Jim Thomson wrote:
> 
> 
> ###  How can a tiny coil in the plate lead possibly screw up the tuning on the lower bands ?  The most it will do is lower the plate load Z on10m a whole bunch... and lower it a little bit on 15m,
> and even less on 20m.  A tiny bit on 40m..and next to nothing on 80m.  I had a hb 2 x 813 GG amp back in 1974..and it too had the L–PI config.  80-10m. 

Have you ever actually tried tuning the amp BOTH ways, Jim...? If you haven't, please do---and be prepared to be amazed.

> 
> ##  The YC-156 is one of the worse for C.... 35 pf..which rises to 50 pf, when bolted to the chassis.  The L-PI is used there too.  Baffles me why you would have to shunt out the tiny coil when on the
> lower bands. 
> 

Ditto above, Jim! I can only share with you my own personal real-world experiences here...

~73~ de Eddy VE3CUI - VE3XZ