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Old 25th May 2015, 06:11 PM   #901
jazbo8 is offline jazbo8
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What is more interesting is the primary impedance of the Dynaco A470, even though it is spec'd at 4.3k, most measurements on old transformers showed it being closer to 5k or 6k.

Last edited by jazbo8; 25th May 2015 at 06:13 PM.
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Old 25th May 2015, 06:15 PM   #902
Ray Waters is offline Ray Waters  United States
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Quote:
Originally Posted by euro21 View Post
diytube.com • View topic - Sanity check of A470 Output Xfmrs

"From my mid 70s Japanese Dynaco A470 (out of circuit, on my bench):
Measured with Wavetek Meterman 37XR:

Center Tap to front plate lead = 87 ohms
Center Tap to rear plate lead = 104 ohms
Center Tap to front screen lead = 29 ohms
Center Tap to rear screen lead = 34 ohms

I measure 10H from center tap to either plate connection."
Good information! This tracks closely with the specifications of the Transcendar version of the A-470 transformer. Thanks for the link.
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Old 25th May 2015, 06:38 PM   #903
jazbo8 is offline jazbo8
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Quote:
Originally Posted by Ray Waters View Post
This tracks closely with the specifications of the Transcendar version of the A-470 transformer.
Hmm, 100H (Transcendar) vs. 20H (measured) doesn't look so close...
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Old 25th May 2015, 08:20 PM   #904
Ray Waters is offline Ray Waters  United States
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Originally Posted by jazbo8 View Post
Hmm, 100H (Transcendar) vs. 20H (measured) doesn't look so close...
Whoops, you're right. I saw 10H (center tap to plate) and read 100H. I'm not sure what to believe at this point...
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Old 25th May 2015, 09:04 PM   #905
jazbo8 is offline jazbo8
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100H might be a mis-print or just a "marketing spec", since it is 2 lbs lighter than the original, it is unlikely that it has a much higher inductance.
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Old 25th May 2015, 09:46 PM   #906
Ray Waters is offline Ray Waters  United States
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Originally Posted by jazbo8 View Post
100H might be a mis-print or just a "marketing spec", since it is 2 lbs lighter than the original, it is unlikely that it has a much higher inductance.
Probably a misprint (which I should have realized), since the 60 watt A-431 is spec'ed at 40H for the primary inductance.
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Old 26th May 2015, 05:02 PM   #907
rongon is offline rongon  United States
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Another question about modeling a center-tapped choke...

Let's say I want to model a Tango TC60-15W (plate choke with a center-tap). With the center-tap left unused, and the choke used 'single-ended', the primary L is spec'd at 60H, 730 ohm DCR.

If I use the center-tap to B+ and each end of the winding goes to the plates of a push-pull pair of triodes, should I enter 15H as the inductance and 182.5R for each half of the choke (from center-tap to each end)?

I'm using what I learned about calculating inductance of a push-pull choke to apply here.

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Last edited by rongon; 26th May 2015 at 05:11 PM.
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Old 26th May 2015, 05:36 PM   #908
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Each winding is 30H and 365R if they are used separately which isn't really the case for a PP output stage, I think...
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Old 4th June 2015, 03:08 AM   #909
rongon is offline rongon  United States
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Default 6P43P?

Is there, or has there ever been, a SPICE model for the Russian 6P43P-E pentode?

I've collected as many data sheets and curves as I could find. I've attached some to this post, in the (perhaps misguided) hope that one of you SPICE wizards can possibly make a working model out of the info.

In triode, this looks like a beefy and quite linear driver, or possibly the power tube for a small amp (headphone amp?).
--
Attached Images
File Type: jpg 6P43P-E_Reflektor.jpg (149.8 KB, 203 views)
File Type: gif 6p43p-e_triode_curves_0.gif (20.3 KB, 199 views)
File Type: png 6p43p_triode_curves_Klausmobile.png (11.8 KB, 197 views)
File Type: png 6p43p_triode_low_volts.png (12.7 KB, 198 views)
Attached Files
File Type: pdf 6n43n-E.pdf (53.4 KB, 18 views)
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Old 4th June 2015, 01:44 PM   #910
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I think I may have it, unfortunately I am on the road, so someone else may have to make you one... Or you can find a close US or EU equivalent and use it.
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