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Red Top

 
    
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The Red Top from QRS Music is described as a super detector. The only reference found was on the site wikimedia commons and no details are given.
The dome has been dipped in red lacquer.
The base cap features a logo with an S in a rectangle inside a horizontal diamond.
The wide glass tube envelope is 35 mm in diameter, and excluding the B4 base pins is 91 mm tall.
Reference: Internet.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Updated December23, 2016.
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