Mk III Blue Stripe - Class A Class AB switch

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Gördon

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Just bought a MK III blue stripe picking it up in a week or so. According to the seller (shop) the power amp class switch on the rear top right is labelled Class A and Class AB ? It has 4 power amp tubes. I thought the rear switch was either Class A Simul Class ? Thanks in advance
 
My Mark III DRG Blue Stripe is labeled Simul Class in the up position and Class A in the down position. Perhaps the shop owner is mistaken...?
 
Cheers - yep I’ll get photo taken. Dealer said Class AB top position & Class A bottom. Having said that Simul- Class is Class AB

Cheers
 
The inner two tubes are in class AB and the outer two are A, both the inner and outer tubes together are what makes it simulclass
 
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