6BQ5 UL Curves?
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 14th February 2011, 02:37 PM #1 Troncones   diyAudio Member     Join Date: Dec 2009 Location: Orange County, California. 6BQ5 UL Curves? Where can I find UL curves for a 6BQ5? For EL34 would also be helpful. The other question is what happens to ra? __________________ The Myth: A hand full of Tubes, Caps, Resistors and Iron and you have an Amp. The Reality: You have self induced Dementia. Newbie.
 14th February 2011, 03:35 PM #2 Svein_B   diyAudio Member   Join Date: Oct 2005 Tom Schlangen's Homepage - Tube DIY Pages Here you will find EL84 / 6BQ5 pentode with 40% UL at Eg2 = 300V S.
Tubes4e4
diyAudio Member

Join Date: Jul 2005
Location: Leverkusen
Hi Sven,

Quote:
 Originally Posted by Svein_B 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
__________________
If in doubt, just measure.

Tubes4e4
diyAudio Member

Join Date: Jul 2005
Location: Leverkusen
Hi,

Quote:
 Originally Posted by Troncones For EL34 would also be helpful.
For example, have a look at this Sofia Audiomatica plot.

Quote:
 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
__________________
If in doubt, just measure.

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