05-25-2021, 04:26 PM
Ok, just about ready to button up this radio, replacing grille cloth soon. Replaced all the caps, checked resistors, checked the multi section wire wound resistor, tested tubes and did alignment. The only thing that was bad was the primary for the first detector transformer #6 on the schematic was open, plate circuit in the RF amp. I was able to rewind it no problem. The set isn’t particularly sensitive, better at night as expected. Tried a new set of 24s with no difference. All voltages check out. I’m wondering how sensitive of a receiver the model 70 is? One thing I noticed in checking all the coils in this set is the antenna transformer #2 on the schematic, is constructed differently from most coils. The primary is wound on a separate bobbin mounted at the top of the coil form whereas most are wound directly over the top of the secondary. I was kicking around the idea of winding a new primary directly over the secondary like most are, to see if it improves any. Thoughts!
Ron
Ron
Bendix 0626. RCA 8BX5. RCA T64
Philco 41-250. Philco49-500
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Motorola 61X13. Philco 46-42 Crosley 52TQ
Philco 37-116. Philco 70
AK 35 Philco 46-350
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Philco 60B. Majestic 50
Philco 52-944. AK 84