6H30 data

[Steve Morley]

I've seen Rp data for this tube of 840 ohms and 2000 ohms. Which is correct or is neither?

Thanks, Steve

 

[rayma]

It varies, higher current gives lower Rp and higher gm. Only mu is quasi-constant.

 

[daanve]

6H30 Tube Data

 

[Steve Morley]

Thanks daanve.

Cheers, Steve

 

[TonyTecson]

plate resistance is more plate voltage related, just like mu, and transconductance is cathode current related, the higher the cathode current the greater the gm gets...

a look at the tube datasheets for triodes will show this...

 

[Steve Morley]

Thanks guys.

Steve

 

[TonyTecson]

you will soon learn that increasing the B+ supply increased the cathode currents and so increased the gains...

what then is your limitation? the plate dissipation ratings, make sure you do not approach it, small signals use a fraction of the plate dissipation ratings when considering the tube operating point.....

 

[Eli Duttman]

When gm and R_P are measured, electrical factors affect the result and considerable variance is observed. OTOH, geometry is the principal factor that affects μ and (no surprise) the value observed is sensibly constant.