Don't know your Hammond number but you could use Stancor A53C or A63C. AES, tubesandmore.com , has A53C and Play Things of Past, oldradioparts.com has A53C and A63C. A63C will have a little better frequency response.
Both transformers are 1:3 ratio with center tapped secondary to drive a push pull output stage.
Norm
: Hello I have a bad coupling transformer that couples the 76 Driver to a push - pull pair of 42's. I need to know if someone has an old Hammond catalogue and copuld look this up for me as I have access to a 332 coil. I have also been told that a few other numbers in the 3's and 4's might work. If there would be a better number to use or if the one I have would work I'd like to know. The radio is a GE M-81 equal to an RCA 143 and 242.. I have the schem if this would help. Thanx Brian
The Hammond Catalogue lists the 332 as Plate to PP Grids; Pri. Imp. 20,000; Sec. Imp 80,000; Max Pri. DC 6 ma. The 432 is the same except for sec 20,000/80,000 and DC 8 ma. 333 sec is 20,000/5,000. 335 sec is 9000/2250. 337 sec. is 3200/800.
Ed.
Yes, Hammond 332 will work in your radio. Max primary current is 6 ma. 76 tube is rated at 5 ma. It's made for plate to push-pull secondary so you have the center tap required. It has 20,000 to 80,000 ohms impedance. This would give some gain.
Norm
: Hi,
: The Hammond Catalogue lists the 332 as Plate to PP Grids; Pri. Imp. 20,000; Sec. Imp 80,000; Max Pri. DC 6 ma. The 432 is the same except for sec 20,000/80,000 and DC 8 ma. 333 sec is 20,000/5,000. 335 sec is 9000/2250. 337 sec. is 3200/800.
: Ed.