46-200-122: - Printable Version

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46-200-122: - Radioguy52 - 10-04-2021

Hello"  I picked up a very ragged  Model 46-200:-122 The Beitman 1947 Page 116 seems to be a close match, This one has a PM and electrolytic 40/40/40:

Anyone know if there is some document / notes that describes the 122?  Looks to be a radio in MFG transition design.

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RE: 46-200-122: - Radioroslyn - 10-04-2021

https://philcoradio.com/library/download/service%20info/yearbooks/1946-1947/split/Part8-Philco%20Home%20Radio%20Yearbook%201946-1947.pdf
Look at the last pg it has the updates for the different codes.

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RE: 46-200-122: - Radioguy52 - 10-07-2021

Thank You.. Thats what I need.. Radio apears to be a hybrid and this will hopefuly shed some light on the changes and stages..

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RE: 46-200-122: - Radioguy52 - 10-21-2021

Finaly got her up and running.  Turns out it had a bad 1st stage IF coil open.  Found a similar IF at 30 vs 28 ohms and now she plays. (Retuned the 2 stages and oscilator coil. )  PROBLEM #2.. Sound quality sounds poor and I believe the speaker is causing the distortion.  This is a PM .. Output transformer 245 ohms and speaker 1 ohm.  Is ther a way to substitue another misc speaker 4 ohms and its 400 ohm transformer?

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RE: 46-200-122: - Radioroslyn - 10-23-2021

The dc resistance doesn't matter when choosing an output transformer. It's the ac impedance that counts. What you are looking for is something that has a 2,000 ohm primary impedance and the secondary to match the voice coil. With a 1 ohm (resistance) vc I'd find a 3.5 ohm (impedance) spkr to match your original opt. An 8 ohm spkr is not the best match when there are plenty of 3.5 ohm spkrs around.

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