Thanks for the info and the cool ad
It seems they made this chassis for several years and there were many revisions.
Here's an excerpt from Beitmans 1952.
Quote:
A 12H6 tube may be used instead of a 6AL5 tube for V404 sync discriminator. A 6H6 tube was also used in some sets. The pin numbering for the 12H6 and 6H6 is identical; the 6AL5 pin numbering is different.
When the 12H6 tube is used for V404, an auto-transformer is used to step up the 6.3 volts to 12.6...
If a 12H6 is not available for replacement, a type 6H6 tube may be used if the following changes to the heater circuit are made...
|
It seems not just resistors were in short supply.