CAJames
Seasoned Member
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"I've run every red light on memory lane."
Posts: 2020
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It will probably work fine, IMO. The 5R4 is in between the 5U4 and 5Y3 (or type 80) in the rectifier hierarchy, so if you'd use a 5Y3 in your amp then a 5R4 will be fine. The concern is that is it only rated for a 4 uF power supply capacitor. But I've used them in in my UFOs with no problem and I fell like the maximum current rating is very high and in general old stock rectifiers are really robust so I wouldn't hesitate. But the JMO/FWIW/YMMV.
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