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thr light in pcl82
thr light in pcl82
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Old 22nd April 2012, 08:09 AM   #1
death is offline death  Iran
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Join Date: May 2011
Location: tehran
Default thr light in pcl82

hi there
recently i tried a pcl82 se amp. the problem is with the heater.
i supply the heater with 15 volts ac of a 2x7.5 V,3A transformer.the no load voltage of the trans is about 17volts ac. by my knowledge this tube's heater is a 300mA at 16 volts. it works but when i power on the tube, i see a yellow light shining from the junction of the heater in the tube. it shines for just a second .i want to know if this is bad for the tube.?
my tube is telefunken and is not used so i think maybe the power supply is not good for this kind of tube.or maybe its because of the tube !?
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Old 22nd April 2012, 10:49 AM   #2
v4lve lover is offline v4lve lover  Netherlands
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Join Date: Aug 2010
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thr light in pcl82
dont worry its pretty common .
PCL82 are there in abundance if it breaks replace it .
maybye add an NTC ?

v4lve .
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Old 22nd April 2012, 11:07 AM   #3
Shoog is offline Shoog
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Join Date: Aug 2002
Location: Eire
This type of power on surge is very common on old valves. There is no problem and the valve will give normal service.

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Old 27th April 2012, 08:41 PM   #4
death is offline death  Iran
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Join Date: May 2011
Location: tehran
thank you all
so i think its safe to continue .
last night i was reading "pcc88" datasheet and it said that there is a need for current limitig resistor because of the starting current is high when the filament is cold. i think the ntc may works.
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