[NJARC] Power Supply Question

Sat, 04 Jan 2003 17:37:20 -0500

Joe

Was the speaker ever disconnected?  Seems to me I remember hearing the voice coil
and electromagnet had to be in phase with one another.  Maybe one of the windings
had been reversed inducing hum into the voice coil instead of canceling it.  The
electromagnet is normally used as part of the power supply filtering circuit.
Does anyone else have knowledge or experience with this?

Aaron

[email protected] wrote:

> Jim,
>        Thanks for the advise.  Unfortunately, I don't have any extra 35's or
> 47's to substitute.  I've tried the 27's and 80 with no changes.  Tapping the
> tubes, chassis, etc..., produces no noise.
> The tube complement for the Sparton 15 is:
> 27 x 3,
> 35 x 3,
> 47 x 1,
> 80 x 1.
>        I'll go back to the original caps and bring it to the meeting next
> week.  I'm sure other sets of eyes will see what I'm not.
>
> Thanks again.
> Joe
>
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