Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Stereomour => Topic started by: ebag4 on August 04, 2011, 06:30:17 AM

Title: Stereomour Power Transformer
Post by: ebag4 on August 04, 2011, 06:30:17 AM

Would there happen to be a spare 12-0-12 output rated at 5VA available on the power transformer of the stereomour?

Best,
Ed

Title: Re: Stereomour Power Transformer
Post by: Paul Joppa on August 04, 2011, 07:26:09 AM

No.

The 12-volt CT winding (6-0-6v) can deliver about 0.5 amps RMS current; the 12AT7 consumes 0.15 amps so there is 0.35 amps to spare. That's about 4.4 volt-amps.

The center tap must be grounded since this winding serves as an electrostatic shield for the 2.5v windings. Are you thinking perhaps of generating a +/-12vDC supply for some other circuit? If so, that could possibly be done.

Title: Re: Stereomour Power Transformer
Post by: ebag4 on August 04, 2011, 12:01:14 PM

Quote from: Paul Joppa on August 04, 2011, 07:26:09 AM

No.

The 12-volt CT winding (6-0-6v) can deliver about 0.5 amps RMS current; the 12AT7 consumes 0.15 amps so there is 0.35 amps to spare. That's about 4.4 volt-amps.

The center tap must be grounded since this winding serves as an electrostatic shield for the 2.5v windings. Are you thinking perhaps of generating a +/-12vDC supply for some other circuit? If so, that could possibly be done.

Thanks for the info Paul.  I am going to install a LDR volume control in my Stereomour chassis, if the current transformer could handle it that would save me a small transformer, since it can't I will simply purchase the transformer as well.

Best,
Ed