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Old 29th December 2012, 12:36 AM   #3371
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Using the Peter Daniels boards - when I'm back in CA I'll post a pix in the Jango thread

Sorry I don't have any extra R100s
In fact if I screw up the project goes away
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Old 29th December 2012, 12:43 AM   #3372
6L6 is offline 6L6  United States
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Quote:
Originally Posted by flocchini View Post
I don't have any extra R100s
In fact if I screw up the project goes away
LOL.

I get it.

My delay for my Jango project is chassis - I need to have the UMS drilled into the chassis I am using. (As well as the holes for Peter's boards.) That chassis will be made modular, and serve as the test bed for my F6 and the 'normal' Aleph J.
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Old 29th December 2012, 01:03 AM   #3373
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I am working with Generg to get distortion figures off my F6. Got the probes and software, just brain in the way now!
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Old 29th December 2012, 01:25 AM   #3374
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Hope it works for you - I still haven't got it to work with my brain
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Old 29th December 2012, 02:37 AM   #3375
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Quote:
Originally Posted by flocchini View Post
Hope it works for you - I still haven't got it to work with my brain
Perhaps a nice Circlotron would do the thing for you....

(sorry, bad insider pun)

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Old 29th December 2012, 03:37 AM   #3376
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Originally Posted by Nelson Pass View Post
Perhaps a nice Circlotron would do the thing for you....

(sorry, bad insider pun)


much appreciated
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Old 29th December 2012, 04:33 AM   #3377
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Circlotrons are now on my reading list
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Old 29th December 2012, 11:53 PM   #3378
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I have searched but not found the input level requirements for maximum output. Is it 2 vrms? If so, does it mean that the negative feedback to the transformer primary is mandatory in order to get the smaller Vgs range to stay in class A?
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Old 31st December 2012, 05:57 PM   #3379
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Must be.... I received some SJEP120R125's and ran one thru my home made curve tracer. I think the curves are very close and gives me an op point very close to what Pass talks about. Max Vgs swing is around .6v to .7v to remain in class A. It is quite cold in Los Angeles today and I was not able to get the transistor to go above 35 degrees Celsius. Tried heating it further with a small shrink wrap gun but it did not make a difference on the Id. I have the transistor on a large heatsink.

I did not capture the effect on the below curves, but going above 2 on the Vgs make the upper curves look bad as my tracer can't provide the required incrementing Ig.
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File Type: jpg SJEP120R125 F6 Load Line.jpg (550.1 KB, 382 views)
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Old 31st December 2012, 06:01 PM   #3380
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Neat curves. I wish you and every DIYer a happy, healthy, and prosperous 2013.
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