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Old 1st October 2011, 10:49 AM   #1
hrnous is offline hrnous  Czech Republic
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Default Priboi biasing

hello, what is right bias vloltage for original, not modded Priboi 50 . i, ve never seen original manual,but in schematics is near to g1 tvo voltages, one for priboi 50 ant the other for priboi 75, but with this value - -30V for one tube i get 96mA per lamp, whitch i think is much more... - 48mA idle per one system in lamp.. have anyone right values or scanned manual ?

thanks for all!
s.
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Old 1st October 2011, 05:53 PM   #2
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For Priboi UM-50 the correct standing current per tube (6R3S-I) is 65 mA.
You can measure it (= 0,65 V) above the 10 ohms cathode resistor.

Do not care about g1-voltage, just the cathode current.
Send a Private Message and I send you the full schematic.
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