Peavey Triumph 120 Head Keeps Blowing F4

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Just installed another fuse and it is working now. I wonder if I have a cheap batch of fuses, Got them on eBay and they are made in China.

But then, did an in circuit check on C48 (1000/50V) and see a large Vloss of 26%. Seeing just over 25 VDC at CR15 cathode.
 

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