Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise

It is currently Jan Tue 22, 2019 5:42 pm

All times are UTC [ DST ]

Post New Topic Post Reply  [ 1 post ] 
Author Message
 Post subject: Howard 1932 Model 400 chassis K open interstage audio XFMR..
PostPosted: Apr Thu 05, 2018 6:18 pm 
New Member

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
File comment: Drawing shows components but no part numbers or values.
drawing.jpg [ 199.85 KiB | Viewed 227 times ]

cabinet.jpg [ 49.07 KiB | Viewed 227 times ]

name plate.jpg
name plate.jpg [ 183.84 KiB | Viewed 227 times ]

Post New Topic Post Reply  [ 1 post ]  Moderators: Marcc, Norm Leal

All times are UTC [ DST ]

Who is online

Users browsing this forum: Chas, jrehkopf, Tarpawns, WB7ANG and 12 guests

Search for:
Jump to:  

Privacy Policy :: Powered by phpBB