EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

I am in the process of restoring an early pointer dial Philly, only problem is I don't have the Magnavox speaker or tweeters that belong to this radio,

here is my solution to the problem, not original but it works ok, and if the correct speaker can be found it's just a simple matter of swapping over,

the field coil is replaced with resistors, there is around 17 watts of heat to dissipate hence the large heat sink and die cast box,

my late type psu uses a 10 way Jones plug, this can be seen in the photo.

The cable is sleeved in woven cotton tube, dyed a sand color with rit dye to match the older existing radio leads, the ends are fixed with glue lined shrink tube.

Here is a shot under the chassis,

the four output terminals on the right hand side of the box, allow for a modern 8 ohm speakers to be connected,

I fitted a 2.2uf cap mounted behind the tag strip at the top of the photo, this is in the original Scott schematic as a crossover for the tweeters.

Three 50W metal clad resistors are used to help to spread the heat dissipation, the values chosen give a very close approximation to the original field coil.

I have also added a 20uf motor run cap from the center tap of the output transformer to chassis, not originally fitted, but as the inductance of the field coil is missing, a bit of extra decoupling wouldn't be out of place here,

here is the Jones plug version schematic,

and diagram for the round plug version,

I hope this is of some use to someone.

Mike

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Where did you find the "woven cotton tube"?

Hi Russ,

ebay of all places, there is also a place in the uk called hifi collective, and there is a website in Holland http://www.techflex.nl, they have it,

look on the net for woven cotton sleeve.

mike

WOW!!! Awesome job! What speaker are you going to use with it?

Thanks for the compliment Brad,

I have a 15" Fane that has been in a box for years waiting for a good home, along with a couple of 4" tweeters,

not original I know but at least I can use the radio, and the best bit is nothing has been modified.

Mike

Very nice work. 

Beautiful work Mike, but that is what we have come to expect from you.  :-)

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