The Gold Lion KT-88's are new replacements for my VTL 450MKII amp. If a tube goes bad, it's identified and quickly replaced. The box is filled with 6550 SED's also for used with the 450's. Every once in a while change is fun. The small tubes are replacement 12AX7, 12AT7 and 12BH7. In the past, I have used NOS tubes but market has become to pricy the last few years.

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