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Old 8th January 2004, 03:53 PM   #11
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Default Re: Re: Re: Re: Re: Re: Anyone tried this at home?

Quote:
Originally posted by 316a


12V DC ! Thats a bit wimpy . The things look far more impressive with 20V on them .


I know,tried before,then it's a really lightbulb!



The sockets are adapted from teflon septars . The contacts are removed and the holes opened up . I then insert bullet crimp shells inside the holes and use a slice of teflon with a nut and bolt to retain the contacts .

You have slices of teflon laying around...

Topcaps can be made from terminal blocks withe the connectors removed .

Have made a nice sort of "spring retainer" for that...All clamped nicely,and for high temp..

I just drill out a slice of 1" teflon bar and push the teflon on to the connector once its screwed on to the topcap . None are for sale , you have to make them yourself but I do have a fair quantity of the septar sockets in stock in case you are interested in making some yourself .

Well i sure am:-))

Maybe i can make you happy with something else to trade?
What do you really need,maybe i have it:-))

I should really get busy with the triode curves now......

OOOoops,yep...didn't want to disturb...:-))

Thanks,have a nice evening.

Arthur.

316a
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Old 27th January 2004, 05:57 PM   #12
316a is offline 316a  England
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Default GK71 as a triode

Ran some tests last week on the AVO using an outboard filament supply . Limited by the AVO CT160 tester limits (400V / 100mA) , mu measured as 4 and gm at 2.6mA/V (approx 1.5k) at 60mA/250V . As I can only test up to 400V at present , 250V is about central for calculating mu which is very constant as was gm at various operating points for the same current . As current increases so will mu and Ra will decrease , I would expect Ra to approach 1k and mu to increase to 5 >100mA . Curves are similar to the 845 but lower Ra . Hopefully will have some 5K SE transformers wound in the next few months to see what the things can really do , unless anyone UK based has a pair of 5k SE outputs going begging

316a
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Old 27th January 2004, 08:45 PM   #13
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Default i have some

well there must be here somewhere:-))laying around...think i have some 7 k's...
thanks for the forework...
post when i am underway with the whole thing....but there are 4 amps before that to make...so i'll have to hurry:-))
happy listening!
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Old 27th January 2004, 11:49 PM   #14
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Here is a curve for the GK-71 I did a year or so ago. The curves are alot smoother than they look in the graph, but I plotted onto graph paper straight from the measurement, so I had a time getting it into a computer graph. Hope it's useful.

MichaelGK-71 Triode graph
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Old 27th January 2004, 11:56 PM   #15
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Second try at link

GK-71 Triode Graph
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Old 28th January 2004, 12:01 AM   #16
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Here is a curve for the GK-71 I did a year or so ago. The curves are alot smoother than they look in the graph, but I plotted onto graph paper straight from the measurement, so I had a time getting it into a computer graph. Hope it's useful.

MichaelGK-71 Triode graph
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File Type: jpg gk-71 triode curves.jpg (5.0 KB, 260 views)
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Old 28th January 2004, 04:07 AM   #17
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sorry still can't see them micheal
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Old 28th January 2004, 09:55 AM   #18
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Default picture problem

Sorry, don't know what the problem is. I tried linking to my website and attaching the file and neither one seems to work. If you want to email me I will send you the file. Use a subject line like GK-71 data else I might think it's junkmail.

Michael
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Old 8th February 2004, 06:10 PM   #19
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Thanks Michael....now i have to see when i've got some time on my hands to actually try it out.Let you know when i do..thanks again.
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