Vintage JFD "Sockette" Radio Tube Adapter #24A used to convert/replace a 6SD7GT tube by using a 7A7 tube. The included JFD paperwork/data states that this can also be used to replace a 6SD7GT with a 7F7 tube.
Also can be used to replace a 6SK7GT with a 7A7 or replace a 12SK7GT with either a 14A7 tube or a 7C7 tube.
Comes with the original box and original folded paperwork that has a double sided chart showing which JFD socket numbers are used for the conversion of which tubes.
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