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It is currently 15 May 2021, 22:04

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PostPosted: 17 Feb 2021, 00:42 
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Joined: 17 Feb 2021, 00:22
Posts: 2
Location: Montreal Qc
Hello,
building my first diy tube amp.

Just as in the schematic, connected the 6.3V output of the power transformer to a diode bridge.
The 6.3V from the power trans reads 6.5Vac on my digital multimeter.

Where it seems strange is when I measure the output of the diode bridge I get 3,3 Vac, and 42,8Vdc, still using my digital multimeter. There is no filtration after the diode bridge.

I am no electronics wizz, but I don't understand how 6.5 Vac can become 43Vdc after going through a diode bridge. Does this make any sense to anyone?

Thanks, Phil.


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PostPosted: 17 Feb 2021, 11:58 
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Joined: 17 Feb 2021, 00:22
Posts: 2
Location: Montreal Qc
Just connected a 150 ohm load to the rectifier bridge and it does stabilize the output.
I am now reading 4.7Vdc and 2.5Vac at the resistor.

Not really close to the required 6.3V for the heaters.

Would it be better if I just forgot the rectifier bridge and feed 6.5Vac to the heaters?


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PostPosted: 18 Feb 2021, 19:13 
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Joined: 13 Feb 2013, 11:02
Posts: 55
Location: Canada
Your meter was probably at fault in the first instance. The high ripple throwing things off.
The low DC in the loaded instance is because you have no filtration.

_________________
Dan Santoni
DTS Audio Electronics
www.dtsaudioelectronics.com


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