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Originally Posted by Eric H
Hi Steve,
Never seen that set before but perhaps the chassis is more closely related to the 721?
The 721 has the mini tubes but also has the resistor housing.
The basic chassis seems to have been used in a lot of sets, my 48 Coronado uses a 721 chassis but unlike the 721 it has a fuse on the back apron and a PM Ion trap instead of the EM.
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I look at the 721 as a 621 with updates