Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: luthierwnc on August 08, 2020, 02:11:13 pm

Title: Unusual heater elevation question
Post by: luthierwnc on August 08, 2020, 02:11:13 pm

Hi All.  I built an elevated heater voltage circuit into an amp and then ordered a power transformer without a center-tap on the 6.3v winding.  Can I create an artificial center-tap with resistors and still use the circuit or should I bag it and use the filaments as designed?  Other possibilities include using DC for the preamp tubes.  Thanks, Skip

Title: Re: Unusual heater elevation question
Post by: kagliostro on August 08, 2020, 02:16:12 pm

To me you can

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https://el34world.com/Forum/index.php?topic=10452.msg95779#msg95779 (https://el34world.com/Forum/index.php?topic=10452.msg95779#msg95779)

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Franco

Title: Re: Unusual heater elevation question
Post by: sluckey on August 08, 2020, 02:52:24 pm

Quote from: luthierwnc on August 08, 2020, 02:11:13 pm

I built an elevated heater voltage circuit into an amp and then ordered a power transformer without a center-tap on the 6.3v winding.  Can I create an artificial center-tap with resistors and still use the circuit

Yes, absolutely.

Title: Re: Unusual heater elevation question
Post by: luthierwnc on August 08, 2020, 04:47:56 pm

Like so?

Title: Re: Unusual heater elevation question
Post by: sluckey on August 08, 2020, 05:25:41 pm

yes

Title: Re: Unusual heater elevation question
Post by: luthierwnc on August 08, 2020, 05:35:57 pm

Thank you gentlemen, as always, sh