Golden Tube Audio 
The customer brought the amplifier in for a bench test after a tube was blown. He also said that the high frequency was rolled off on the top end. On the bench test, the amplifier showed a frequency response of only up to around 16 khz. We replaced certain capacitors on the unit, and also upgraded certain components on the amplifier. Subsequent bench test met factory specification. Frequency response was back to normal. 
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