09-05-2013, 05:10 PM
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.
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.
--
Ron Ramirez
Ferdinand IN
