12-22-2008, 09:55 AM
"its chassis has 6 tubes"
***The 5Y3 is a common modification when the transformer develops a high voltage breakdown in the filament winding. Don't try to wire it back to a 5Y4. It may measure OK with a multimeter but will be a short when measured with a high voltage "megger".
What are the tubes in your 37-610? If you have two 6K7's, someone probably exchanged the original chassis with a 37-620 chassis; in that case the extra 6K7 is located on the RF chassis near the 6A8; the 37-620 chassis will also have a three section tuning cap whereas the 37-610 will have only two.
***The 5Y3 is a common modification when the transformer develops a high voltage breakdown in the filament winding. Don't try to wire it back to a 5Y4. It may measure OK with a multimeter but will be a short when measured with a high voltage "megger".
What are the tubes in your 37-610? If you have two 6K7's, someone probably exchanged the original chassis with a 37-620 chassis; in that case the extra 6K7 is located on the RF chassis near the 6A8; the 37-620 chassis will also have a three section tuning cap whereas the 37-610 will have only two.
Pete AI2V
