03-13-2014, 04:27 AM
Regarding the "thunder" noise produced by the 75 tube, before tossing that tube out, try this tip from Arran: Remove the old solder from the grid cap on top, make sure the little wire inside is making good connection to the cap, and resolder. This will often cure the "thunder" issue.
One other thing - There is no such monster as a 37-12.
One other thing - There is no such monster as a 37-12.
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Ron Ramirez
Ferdinand IN