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nrs and current reading interpretation
nrs and current reading interpretation
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Old 16th January 2020, 02:43 PM   #11
jazz is offline jazz  Netherlands
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Join Date: Dec 2001
Location: leiden, physically that is...
Hi,

Thanks for the replies guys. For now the tubes will stay but the message is to change em sometime this year. As for the coupling caps: russian ky42 at 600V suffice I'd say (i Always rate the coupling caps at hv). Anyway, i checked and the don't see more then 400V at start up.

More worried about the 500V psu cap For the output tubes for that matter... That's what brought it in for service in the first place. I'll increase the ntc at the ac input and up the resistance between that cap and the first stage a bit.

regards,
Joris
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Old 16th January 2020, 02:54 PM   #12
Diabolical Artificer is offline Diabolical Artificer  United Kingdom
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Forgive my ignorance but what is "nrs"? Negative regulated supply?

Andy.
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Old 16th January 2020, 03:14 PM   #13
baudouin0 is offline baudouin0
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I was too afraid to ask.
Negative resistance or some disease (Demolition Man)?

Last edited by baudouin0; 16th January 2020 at 03:21 PM.
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Old 16th January 2020, 06:58 PM   #14
Alllensoncanon is offline Alllensoncanon  United States
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Location: NorCal, East Bay
nrs and current reading interpretation
NTC thermistors as in Negative Temperature Coefficient. It is a surge protection device. Increase its initial resistant value should help.
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Old 16th January 2020, 07:55 PM   #15
jazz is offline jazz  Netherlands
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Join Date: Dec 2001
Location: leiden, physically that is...
Hi,

This is about the bias of the tube. Sorry I used the dutch term. It says 'negatieve rooster spanning'. In engrish, negative grid bias....

sorry, my bad.
Joris
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