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1st October 2011, 09:49 AM
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#1 |
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diyAudio Member
Join Date: Jun 2008
Location: Czech
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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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1st October 2011, 04:53 PM
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#2 |
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diyAudio Member
Join Date: Feb 2010
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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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