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 Post subject: Howard 1932 Model 400 chassis K open interstage audio XFMR..
PostPosted: Apr Thu 05, 2018 6:18 pm 
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Joined: Apr Thu 05, 2018 3:25 pm
Posts: 6
I am young and eager to bring back a beauty to life. I have a 1932 vintage Howard Radio Company Model 400 (pictures attached) with chassis type K Serial Number 400006. I can find very little in regards to schematics with actual part numbers and values on them. The problem is I have no audio. I have isolated the problem to the inter-stage audio transformer (not the power transformer or output transformer) is open across the primary (attached diagram marked red with 0VDC). This transformer seems to couple the output of the driver tube (56 tube) to the push-pull audio output stage (two 47 tubes). I have no part number or anything to help me replace this transformer. Any help that anybody could provide would be greatly appreciated.
Craig Brown
Attachment:
File comment: Drawing shows components but no part numbers or values.
drawing.jpg
drawing.jpg [ 199.85 KiB | Viewed 159 times ]

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cabinet.jpg
cabinet.jpg [ 49.07 KiB | Viewed 159 times ]

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name plate.jpg
name plate.jpg [ 183.84 KiB | Viewed 159 times ]


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