ultra-linear plate curves

71.210.35.86

Posted on March 18, 2015 at 13:58:55

Posts: 894
Joined: June 16, 2006

Does anyone have or know where I can find U-L plate curves for the 47 tube?
I will probably end plotting them myself but if I could find some it would
save a lot of time.

Cal

Hide full thread outline!

RE: ultra-linear plate curves

PakProtector

09:36:11 03/19/15

9

RE: ultra-linear plate curves

thermionic addictions

11:52:21 03/19/15

RE: ultra-linear plate curves

jazbo8

10:27:41 03/19/15

7

...

Show full thread outline!

RE: ultra-linear plate curves

PakProtector

09:36:11 03/19/15

9

RE: ultra-linear plate curves

thermionic addictions

11:52:21 03/19/15

RE: ultra-linear plate curves

jazbo8

10:27:41 03/19/15

7

RE: ultra-linear plate curves

PakProtector

17:43:37 03/20/15

6

RE: ultra-linear plate curves

jazbo8

14:08:25 03/21/15

5

RE: ultra-linear plate curves

thermionic addictions

15:21:47 03/21/15

4

RE: ultra-linear plate curves

jazbo8

21:05:37 03/21/15

3

RE: ultra-linear plate curves

thermionic addictions

13:35:19 03/22/15

2

RE: ultra-linear plate curves

jazbo8

01:01:36 03/23/15

RE: ultra-linear plate curves

thermionic addictions

09:59:02 03/23/15

RE: ultra-linear plate curves

6bq5

14:42:58 03/18/15

RE: ultra-linear plate curves, posted on March 18, 2015 at 14:42:58

6bq5
Audiophile

Posts: 4393
Location: SF Bay
Joined: August 16, 2001

I googled "RCA Tube Data:47"
and found a bunch of links - this may help
Happy Listening

Cunningham data

RE: ultra-linear plate curves, posted on March 19, 2015 at 09:36:11
PakProtector Audiophile Posts: 12366 Joined: May 14, 2002	You will some means of seeing what the plate response is with a varied g2 voltage. The curves with I_p at various g2 voltages( v_g1=0) are the only way to do this with the required accuracy. Triode curves will provide part of this, but only at V_g2=V_p cheers, Douglas Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

RE: ultra-linear plate curves, posted on March 19, 2015 at 10:27:41
jazbo8 Audiophile Posts: 70 Location: Europe Joined: January 16, 2012	What is the UL tap % that you would like to use?

RE: ultra-linear plate curves, posted on March 19, 2015 at 11:52:21
thermionic addictions Audiophile Posts: 894 Joined: June 16, 2006	Hi Douglas I did manage to find some triode curves for the 47 so I guess I'll look over the info I have so far and go from there. It might be easier to just buy a cheap U-L, OPT from Edcor and breadboard it and see what it sounds like. Cal

RE: ultra-linear plate curves, posted on March 20, 2015 at 17:43:37
PakProtector Audiophile Posts: 12366 Joined: May 14, 2002	That depends on the tube characteristics. It is hard to generalize. For a low voltage 813, I think 20% is very good. The U-L curves depend on where you start; B+ that is. The 47 curves look like they'll like low percentage taps too. cheers, Douglas Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

RE: ultra-linear plate curves, posted on March 21, 2015 at 14:08:25

jazbo8
Audiophile

Posts: 70
Location: Europe
Joined: January 16, 2012

Here is the UL characteristic with 20% tap, not sure it does much...

RE: ultra-linear plate curves, posted on March 21, 2015 at 15:21:47
thermionic addictions Audiophile Posts: 894 Joined: June 16, 2006	Hi Jazbo8 Thanks for the curves. But you are right they don't look that much different than the pentode curves. I wonder how the traditional 43% curves would look? Cal

RE: ultra-linear plate curves, posted on March 21, 2015 at 21:05:37

jazbo8
Audiophile

Posts: 70
Location: Europe
Joined: January 16, 2012

You are welcome, here is how it looks at 43%, a bit better...

RE: ultra-linear plate curves, posted on March 22, 2015 at 13:35:19
thermionic addictions Audiophile Posts: 894 Joined: June 16, 2006	Thanks again jazbo8. That does look better. I think I will go with that since these are easily obtainable "off the shelf" transformers. By the way what curve tracer are you using for this it does a nice job. Cal

RE: ultra-linear plate curves, posted on March 23, 2015 at 01:01:36
jazbo8 Audiophile Posts: 70 Location: Europe Joined: January 16, 2012	You are welcome. The graph was not done with a curve tracer though, you can plot the UL characteristics with a simulation program if you have the SPICE model, which was what I did.

RE: ultra-linear plate curves, posted on March 23, 2015 at 09:59:02
thermionic addictions Audiophile Posts: 894 Joined: June 16, 2006	Interesting I might have to look into that. Cal

Tube DIY Asylum

ultra-linear plate curves

71.210.35.86