Vintage output transformer - from memory, this was salvaged from a pro tape recorder (early transistor era) so probably has decent frequency response. Shielded enclosure (soldered). With the following markings:
1594I, 73-4-2
Primary 15,000 ohms @5mA DC
Secondary: 62.5, 150, 250 or 600 ohms
Any known circuit designs out there calling for a transformer like this?
Can this transformer be directly coupled with a tube output stage (e.g. 12AU7)?
What else might it be good for?
Can it handle balanced I/O (given the separate shield terminal)?
Any suggestions -- tubes, circuits, topologies -- would be appreciated. Had this for a long time, I'm weighing up whether to finally build something simple and straightforward, like a microphone preamp, or sell it on.
1594I, 73-4-2
Primary 15,000 ohms @5mA DC
Secondary: 62.5, 150, 250 or 600 ohms
Any known circuit designs out there calling for a transformer like this?
Can this transformer be directly coupled with a tube output stage (e.g. 12AU7)?
What else might it be good for?
Can it handle balanced I/O (given the separate shield terminal)?
Any suggestions -- tubes, circuits, topologies -- would be appreciated. Had this for a long time, I'm weighing up whether to finally build something simple and straightforward, like a microphone preamp, or sell it on.
Attachments
For testing you may drive it through a nominal impedance resistor, say 15k, and measure secondary frequency response, then decide what to do with it.
Measuring beats guessing 1000:1
Measuring beats guessing 1000:1