6BQ5 UL Curves?

Troncones · 14th February 2011, 02:37 PM

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 · 14th February 2011, 03:35 PM

Tom Schlangen's Homepage - Tube DIY Pages

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

S.

Tubes4e4 · 14th February 2011, 08:25 PM

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

Tubes4e4 · 14th February 2011, 08:34 PM

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

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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help with setup to trace UL curves	avincenty	Tubes / Valves	17	26th February 2010 04:53 PM
5-125 UL curves anyone?	dowdylama	Tubes / Valves	2	10th October 2008 11:43 AM
EL34 UL Curves	draperphoto	Tubes / Valves	8	29th September 2008 11:54 AM
6AG7 UL Curves	sorenj07	Tubes / Valves	6	16th October 2007 05:17 AM
Derive Triode Curves from Pentode Curves?	dsavitsk	Tubes / Valves	3	14th May 2007 06:10 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)