Re: [TCML] VTTC-tuning. John got me started ;-)

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi Dr. John,

Have you looked into the Miller effect? The plate to grid capacitance is 
low in the pF's, but as the tubes are usually triodes?? Probably still 
far to small to make a big difference on the primary, however, it seems 
it would effect maybe some drift in the tubes frequency response and the 
tube would vary differently depending on secondary characteristics 
(int/ext C). I guess what I'm trying to say is that maybe the slight 
changes in for example the top terminal C is mainly affecting the 
frequency response of the tube. I would think spark loading impedance is 
a major factor when tuning and it would appear although resonance is 
important of course, in a VTTC, the tubes frequency response is affected 
by the those sparks and slight other changes in C, and tuning is a means 
of really getting the tube itself to respond well.

Just thoughts, no experience here.
Take care,
Bart

Dr. John W. Gudenas wrote:
> Every tube has a set of characteristics that are defined by the maker 
> usually referred as the "characteristic curves".  Fortunately for our 
> common transmitting triodes this operating data is all readily 
> available. Output impedance is an important issue for optimal 
> performance. For example, consider an audio amp that matches to 8 ohm 
> speakers. If you use 16 ohm speakers you will still hear sound but 
> loose a lot of power.

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