EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

Hi Folks,

Haven't been here in quite a while!

I have a question about a Super 12.

I have one I want to rebuild(new cap.'s and resistors). Mine MAY have some missing components. I can see that most of the resistors are 1/4 or 1/2 watt, but are there a few larger wattage one's in there also? Have never located a parts list. I do have all the manuals and schematics.

So my request would be if someone could tell me what resistors are of other power ratings-either by location/function on the schematic or by resistance value.

MANY thanks for any help-and we'll get another radio on the road!

Views: 62

Comment by Norman S Braithwaite on February 24, 2015 at 10:08pm

By the time EH Scott was building the Super 12, they were using resistors that are very reliable and stable.  Chances are that only a few will require replacement.  Most of the original resistors are 20% tolerance and still have resistance within this tolerance.  I recommend that you check the resistors and if you have questions about particular resistors, ask about them.

Norman

Comment by John Berkovitz on February 24, 2015 at 10:58pm

Norman,

Thanks for the quick reply!

What I really need to know though is the power ratings of the resistors. I can go thru the unit with the schematic and visibly see the size of the resistors. However. I'm sure a few are missing, especially in the power supply section. Sure hate to put in a 1/2 or 1 watt when a 5 watt is required! Apparently a parts list was never published for this model. I'll have to go thru it, i.d. the missing resistors, then inquire about the wattage.

Thanks-I'll be back!

Comment by David C. Poland on March 5, 2015 at 1:33pm

Did you pull Riders information on the Super XII?

In many respects the Super XII is a somewhat scaled down Model Sixteen - simplified power supply with one less rectifier tube, scaled down audio circuit less the push-pull 6J5 drivers.  The remaining parts are pretty much the same. so referring to the Sixteen information may be helpful. 

The voltage divider is a candohm unit riveted to the side of the chassis below the IF transformers, same unit as on the Sixteen and 14 tube Masterpiece. 

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