Products > Amp Audio Upgrade Kits > Quad 11 Power Amplifier Series

Our audio upgrade kits offer a selection of the best quality modern production items along with high quality new old stock valves to give you an improved sound and a cost effective upgrade. We have over 30 years' experience with using and listening to high end audio amplifiers and over 25 years in improving the valves. These kits have been put together after many hours of listening tests to confirm the valves performance in any given application.

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  • NameBrandCommentStockPrice PhotoOrder
  • Quad 11 Eighty Mono Power Amplifier JJ KT88 6SL7 Upgrade Kit Pair Quad Amplifiers The Quad II Eighty mono power amplifier upgrade kit is for a pair of monoblock amplifiers. The Quad 11 Eighty is an ...In stock£574.00Buy Now
  • Quad 11 Forty Mono Power Amplifier JJ KT88 Upgrade Kit PairQuad Amplifiers The Quad II-Forty mono power amplifier upgrade kit is for a pair of monoblock amplifiers. The Quad 11 Forty is an ...In stock£300.00Buy Now
  • Quad 11 Forty Mono Power Amplifier Gold Lion KT88 Upgrade Kit PairQuad Amplifiers The Quad II Forty mono power amplifier upgrade kit is for a pair of monoblock amplifiers. The Quad 11 Forty is an ...In stock£352.00Buy Now
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All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by all EU countries.


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