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#26 pre amp
#26 pre amp
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Old 21st March 2013, 12:22 PM   #2711
merlin el mago is offline merlin el mago
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87,5V
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Old 21st March 2013, 12:22 PM   #2712
stajo is offline stajo  Sweden
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#26 pre amp
Ok, measure voltage over 10 ohm cathode resistor.
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Old 21st March 2013, 12:24 PM   #2713
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Old 21st March 2013, 12:32 PM   #2714
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#26 pre amp
Hmm, peculiar. Voltage over 20 k filter resistor?
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Old 21st March 2013, 12:38 PM   #2715
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Old 21st March 2013, 12:41 PM   #2716
stajo is offline stajo  Sweden
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#26 pre amp
Ok, can you parallell the 20 k with something like a 100 k, or change it to something like a 15 k? And measure drop over "the new" 20 k and B+ on tube? Measure the new resistorvalue in ohms to plz.
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Old 21st March 2013, 12:46 PM   #2717
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I have 15K, please wait I do the change.
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Old 21st March 2013, 12:59 PM   #2718
merlin el mago is offline merlin el mago
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Across 15K 151,8V, plate 98V
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Old 21st March 2013, 01:03 PM   #2719
stajo is offline stajo  Sweden
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#26 pre amp
Ok, tube starts to bias up. Im at work so I have no PSUD. Try same with 10 k
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Old 21st March 2013, 01:11 PM   #2720
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ok
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