SmartFold, кстати, вот даже на сайте SoZo описание этих конденсаторов:
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Our BlueMolded line of capacitors are retrofits for Astron or Blue Molded caps used in vintage tweed, brown, and blackface Fenders™.
These capacitors amazingly capture vintage fender tones of the Blackface era, and the famous 1959 tweed 5F6-A Bassman era; which is so musical and good,
Marshall modeled their amps after them!
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Думаю вопрос исчерпан