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New Tim Mellows OTL project
New Tim Mellows OTL project
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Old 25th August 2017, 08:00 PM   #781
victor dascalu is offline victor dascalu  Romania
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Nice work, congrat.
Can you post your final schematics with balanced input?
Have you tried a CCS stage on the triode cathods?
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Old 25th August 2017, 08:04 PM   #782
victor dascalu is offline victor dascalu  Romania
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Quote:
Originally Posted by Black Jack View Post
I think you haven`t any chance to match 33`s from batch of 10. Need 100 tubes
I preburn 33`s with heater 6-9-12 VDC for 12 hours each step.
Also I decrease bias to 50 mA in OTL and burn some hours before 100 mA and 200 mA...
Why 6-9-12 vdc and why dc ?
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Old 25th August 2017, 08:29 PM   #783
Black Jack is offline Black Jack  Ukraine
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It`s "training"
Because 6C33C work with 12.6 Vrms heaters in Tim Mellow`s design.
And applying standard voltage for new tube is not good.
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Old 25th August 2017, 08:32 PM   #784
victor dascalu is offline victor dascalu  Romania
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ok, let say trainning, but why dc instad of ac?
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Old 26th August 2017, 06:23 PM   #785
Black Jack is offline Black Jack  Ukraine
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No matter AC or DC for training. VAC_rms = VDC
And using 12.6 VDC the same as 12.6 VAC
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Old 6th December 2017, 07:05 AM   #786
Tyimo is offline Tyimo  Hungary
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Hi!

How many Vrms needs the 6C33C output stage for full output power?

Greets:
Tyimo
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"Replacing any coupling capacitors with a well designed and correctly matched driver or interstage transformer yields an almost shocking improvement in sound..." Peter Qvortrup
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