6BQ5 UL Curves?

[Troncones]

Where can I find UL curves for a 6BQ5? For EL34 would also be helpful.

The other question is what happens to ra?

 

[Svein_B]

Tom Schlangen's Homepage - Tube DIY Pages

Here you will find EL84 / 6BQ5 pentode with 40% UL at Eg2 = 300V

S.

 

[Tubes4e4]

Hi Sven,

Tom Schlangen's Homepage - Tube DIY Pages
Here you will find EL84 / 6BQ5 pentode with 40% UL at Eg2 = 300V

Which, BTW, shows a very standard operation condition situation like with the Mullard 5-10 and all its numerous clones (that is why I made this plot). Okay, Mullard states Eg2=315V for the original model 5-10, but hey, deviation from the Eg2=300V plot will be well within valve tolerances...

Regards,

Tom

 

[Tubes4e4]

Hi,

For EL34 would also be helpful.

For example, have a look at this Sofia Audiomatica plot.

The other question is what happens to ra?

For rising values of screen FB ratios (screen FB essentially is cathode FB, indeed) the dynamic internal anode resistance will fall.

Regards,

Tom