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Not sure on '48 model, but, by '49 it went to miniature I F 's.
They are troublesome.
Also, seems to have some problem with primary of audio output transformer shorting to chassis, and, burning up.
The fil. resistor in all of these tends to short to bracket, and, will cause a hum problem. Also have seen them blow out, going open.
Price seems a little high, but, you are saving on shipping, and, that may well make up for the over cost.
Hope this helps.
Bill Cahill
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