Re: A Hallicrafters S27
The output transformer was probably replaced because of the odd secondary impedance, 500 and 5K ohms, instead of the usual 4 to 8 ohms normally used with a speaker. If the original Hallicrafters speaker was purchased with the receiver, it would've been fitted with a matching transformer.
BTW, the original issue Hallicrafters speakers are as valuable as the receiver, or possibly a bit more.
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