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Bummer, but

I think there may be an easy answer - replace the B+ fuse. Manley/VTL amps fuse the high voltage so that if a tube does go supernova, it doesn't take out fellow components on the board. The only bad news is that those 600V fuses are a bit pricey. I keep a stock of them on hand just in case. When tubes age, they tend to require a higher level of bias and sometimes they get cranky and blow the B+.

Bias procedure is also pretty straight forward requiring only a basic VOM and a few minutes of your time.

The Manley website has legacy manuals online. From appearance, it appears you have the "Lab Series 100 watt monos". Click here for the manual.

Good luck!

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  Kimber Kable  

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