02-09-2022, 08:51 PM
The early 90 with two 45 tubes had no metal plate between the four tubes closest to the electrolytics.
Early production of the "middle" 90 with one 47 tube used a round shield over one of the 27 tubes in that four tube section.
Later production 90 sets with one 47 tube, as well as all late 90 sets with two 47 tubes, had the metal plate.
Early production of the "middle" 90 with one 47 tube used a round shield over one of the 27 tubes in that four tube section.
Later production 90 sets with one 47 tube, as well as all late 90 sets with two 47 tubes, had the metal plate.
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Ron Ramirez
Ferdinand IN
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