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Old 10th April 2012, 12:58 AM   #641
Salas is online now Salas  Greece
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Do this and you should have no hum. Your 6.3V secondaries aren't strong enough and you parallel those I suppose.
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Old 10th April 2012, 12:59 AM   #642
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Yup.
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Old 10th April 2012, 12:59 AM   #643
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buzz

one 6V3 winding is directly connected across 5U4's 5V heater !

does just one 6V3 winding have enough current for heating 5U4?
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Old 10th April 2012, 01:01 AM   #644
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Do this and you should have no hum. Your 6.3V secondaries aren't strong enough and you parallel those I suppose.
Just to be sure, you are saying wire the two 330V secondaries in series , not parallel, and common point between two taken to ground.
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Old 10th April 2012, 01:03 AM   #645
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buzz

one 6V3 winding is directly connected across 5U4's 5V heater !

does just one 6V3 winding have enough current for heating 5U4?
I have both 6.3V secondaries in parallel to rectifier. Should be 6A. Antek generally under spec's their trafos, so even one should do, rated at 3A; although working too hard i would imagine.
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Old 10th April 2012, 01:04 AM   #646
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I just saw what Salas wrote about weak windings ........

you canconnect them in parallel , but!! securing that each 6V3 winding have own fixed resistor ;

so determine those resistors by trial and correct , going from higher value , that way that they're paralleled at tube heater

than take your Ub from whatever side of rectifier tube's cathode , as Salas posted
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Old 10th April 2012, 01:06 AM   #647
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Use one 3A 6.3VAC secondary with your CL60 is another way. Should suffice. If it goes a little under 5VAC is better for the 5U4G's lifespan.
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Old 10th April 2012, 01:07 AM   #648
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Quote:
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I just saw what Salas wrote about weak windings ........

you canconnect them in parallel , but!! securing that each 6V3 winding have own fixed resistor ;

so determine those resistors by trial and correct , going from higher value , that way that they're paralleled at tube heater

than take your Ub from whatever side of rectifier tube's cathode , as Salas posted
THe resistors before parallel point being an attempt to balance draw and reduce hum, as hum is essentially a difference or imbalance in voltage?
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Old 10th April 2012, 01:08 AM   #649
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Old 10th April 2012, 01:14 AM   #650
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