[murf]

Anyone know ifthe speaker and output transformer from a 37-630 would be the same as the speaker in a model 620?
I believe the 620 was made in 1936.
The 630 is a 6 tube set, while the 620 is a 5 tube set.
Thanks

[Radioroslyn]

When did they change??? Both have 6 tubes. The 610 has 5 tubes. Speaker should work on all 3 if the field coil is the same
Terry

[murf]

Your right Terry,
My mistake.
What I should have asked, is if the output transformer is the same on both.
Thanks

[Radioroslyn]

Generally speaking if the output tube is the same your good in terms of the output transformer.It must have the same type of output stage single ended or push-pull. If the set has more tubes it's going to pass more current though the field coil. So as long as it's only a tube or two you should fine.
GL
Terry

[Ron Ramirez]

The 610, 620 and 630 used a single ended 42 output tube.

The 37-610, 37-620 and 37-630 used a single ended 6F6G output tube.

42 and 6F6G have the same characteristics; the 6F6 is the octal version of the 42.

The output transformer may have a different part number, but the impedance should be the same.