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-   -   Center tap or not... (http://www.diyaudio.com/forums/tubes-valves/186670-center-tap-not.html)

ixe13 8th April 2011 04:09 PM

Center tap or not...
 
Hi,

I need extra filaments 10 volts AC taps for 2 310A tubes, I suppose I can use a totally independant small transformer (1 Amp) from the main tranformer, and connect the 2 301A filaments in parallel?

But, does it need to be center tap? cause without the center tap it's much smaller. Not much room in the chassis

Would save me from having to buy a new power transformer.


Thanks

Wavebourn 8th April 2011 04:34 PM

You can balance filament by a pair of 100 Ohm resistors. They are small. So center tap is not necessary.

ixe13 8th April 2011 04:41 PM

Quote:

Originally Posted by Wavebourn (Post 2531977)
You can balance filament by a pair of 100 Ohm resistors. They are small. So center tap is not necessary.

Hi Wavebourn,

Please forgive my ignorance, how can I do that?

Thanks,

kevinkr 8th April 2011 04:45 PM

Quote:

Originally Posted by ixe13 (Post 2531990)
Hi Wavebourn,

Please forgive my ignorance, how can I do that?

Thanks,

Wire the two resistors in series across the filament lines, ground the center between them. Use a pair of 100 ohm 5% 1W metal oxide or similar.

ixe13 8th April 2011 05:23 PM

1 Attachment(s)
kevinkr, cool, thanks


like this:

ixe13 8th April 2011 06:31 PM

Quote:

Originally Posted by ixe13 (Post 2532045)
kevinkr, cool, thanks


like this:

Actually it was meant as a question : Like this?

to all...

:p

DigitalJunkie 8th April 2011 10:45 PM

Yep,like that. :)

ixe13 8th April 2011 11:14 PM

Awwwright,

Thanks guys,


:D


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