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AI500 1 tube overglow
AI500 1 tube overglow
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Old 14th January 2019, 04:59 PM   #11
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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That is not possible to go between pins 3 & 5 it is definitely on pins 4 & 6.
Replace the resistor and measure the grid voltage on pin 5.
CAUTION, there is a possible 350volts on pin 6!
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Old 14th January 2019, 05:37 PM   #12
leiflende is offline leiflende
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I dont know how you would count that otherwise than clockwise from after fitting slit of socket/tube. I am just reading the numbers pregnated on the pictured downside of the socket. As you can see on picture they are numbered 3 and 5, while 4 is the middel (bottom) one not connected with resistance. So you mean its a 100 ohms and not 1 k.ohms resistans?
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Old 14th January 2019, 05:53 PM   #13
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Originally we fitted 100R some had 1k0. I prefer 1k0 but measure the others and fit the same.


The link of wire is between pins 8 & 1. so count clockwise from the right hand tag (pin1).
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Old 19th January 2019, 11:43 AM   #14
leiflende is offline leiflende
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It blows the 2,5A main fuse quite fast with that tube 4 inserted, so I have to measure fastly.
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