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Old 18th September 2006, 03:55 AM   #1
zxx123 is offline zxx123  United States
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Default Secondary Tap of Power Transformer?

hi, I am planning to build up a simple 6V6 PP Power Amp (10W
only PI circuit with a 12AT7 per a channel).
I have a power transformers, of which the secondary tap has
a 125-0-125 120mA tap.

Does it mean that it can provide more than 250V DC
to power tubes?

If not no, can anybody recommend me a hammond pwr for this project?

Thanks.
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Old 18th September 2006, 05:07 AM   #2
jarthel is offline jarthel  Australia
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Default Re: Secondary Tap of Power Transformer?

Quote:
Originally posted by zxx123
hi, I am planning to build up a simple 6V6 PP Power Amp (10W
only PI circuit with a 12AT7 per a channel).
I have a power transformers, of which the secondary tap has
a 125-0-125 120mA tap.

Does it mean that it can provide more than 250V DC
to power tubes?

If not no, can anybody recommend me a hammond pwr for this project?

Thanks.
if you don't use the CT (i.e. use bridged diodes), it can provide approximately 250 x 1.414 VDC (if capacitor input)
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Old 18th September 2006, 01:35 PM   #3
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Using a full-wave bridge rectifier, no connection to tap, you can get about 300V at 90 mA, which should be enough for a push-pull pair of 6V6s.
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Old 18th September 2006, 01:46 PM   #4
zxx123 is offline zxx123  United States
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Join Date: Aug 2003
Location: ca
Quote:
Originally posted by Tom Bavis
Using a full-wave bridge rectifier, no connection to tap, you can get about 300V at 90 mA, which should be enough for a push-pull pair of 6V6s.

;Hmm, connecting 0-125 with bridge diode (and capacitor input)
will make 300V at 90ma, right?
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Old 18th September 2006, 11:09 PM   #5
jarthel is offline jarthel  Australia
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Join Date: Jan 2002
Location: somewhere in Australia
Quote:
Originally posted by zxx123



;Hmm, connecting 0-125 with bridge diode (and capacitor input)
will make 300V at 90ma, right?
read my message again. when I said "no CT", I meant the leads to the bridged diodes are connected to both the 125V.
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