UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

usradcoll1 · 4th Dec 2017, 5:57 pm

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.

4th Dec 2017, 5:57 pm	#7
usradcoll1 Heptode Join Date: Mar 2017 Location: Cedar Grove, Wisconsin, USA. Posts: 823	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.