05-26-2007, 12:13 PM
All are rated at 1140 ohms. The value is not given in Bulletin 250 (37-620) or Bulletin 251 (37-630), but is given in Bulletin 251A (revision for both 37-620 and 37-630).
The 8 inch K-38 speaker used in Model 37-630T has a larger field coil than that used in Model 37-620B (S-7), even though they have the same DC resistance. Heavier field - better bass response. Ditto the 10-1/2" speakers used in the console models (H-24 and HS, respectively) - note that the originals were 10-1/2" diameter, not 12".
The 8 inch K-38 speaker used in Model 37-630T has a larger field coil than that used in Model 37-620B (S-7), even though they have the same DC resistance. Heavier field - better bass response. Ditto the 10-1/2" speakers used in the console models (H-24 and HS, respectively) - note that the originals were 10-1/2" diameter, not 12".
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Ron Ramirez
Ferdinand IN
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