Could be someone did a switcherooney on the tubes. When I track down a schematic I'll find out for sure. 
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Altec Valencias ESS AMT1A Monitors Revox B795 TT Uher Royal Deluxe RTR VAS Cit Sound Mono Blocks HK Cit I II III Acrosound UL2 Acrosound S1001 ARC SP3
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