Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Stereomour => Topic started by: balancedtriode on November 12, 2012, 05:29:09 PM

Title: Using a "paramount" Driver board for a stereomour?
Post by: balancedtriode on November 12, 2012, 05:29:09 PM

hey,
I saw a old post PJ made about the possibility of a redesign of the paramount driver board for the stereomour which uses the 5670 tube. Is this still in the works?
I bet there would be some enthusiasm about such a product!
thanks any info would be appreciated
thanks,
Coltrane

Title: Re: Using a "paramount" Driver board for a stereomour?
Post by: Paul Birkeland on November 12, 2012, 06:15:25 PM

Hello Coltrane,

The PC board in the Steremour is functionally nearly identical to the soft start PC board (the Soft Start board is a little more flexible).

Since the 5670 is strictly a 6.3V tube and the Steremour has a 12V heater winding, this is probably not the best choice. 

-PB

Title: Re: Using a "paramount" Driver board for a stereomour?
Post by: balancedtriode on November 12, 2012, 10:42:50 PM

I should have looked at the schematic before posting,
sorry.

Title: Re: Using a "paramount" Driver board for a stereomour?
Post by: Paul Joppa on November 14, 2012, 10:41:29 AM

The useful thing the soft-start board has is an adjustable shunt-regulator chip you can use as the cathode bias for the drivers. This allows lower-gain tubes such as the 12AV7, 5965, 12AY7, 12SN7, etc. to be used - if you don't need the gain. Some of these will need an adjustment in the plate current as well for optimal operation.