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The customer can upgrade later by adding a K41
and good matching between two tubes stays constant like this over the full lifetime
at maximum 170mA
6922 EH Electro-Harmonix on the input and 12BH7 Yugoslavian EI output buffers
the NAD C 268 has features and technology unmatched by other amplifiers in its class
Emission Labs 30A (Pair) 50 The customer can upgrade laterFor these tubes we use a very fine gold grid wire, with a gain of 21x for the 20A and 20B, and 32x for the 30B. It is recommended to use these tubes transformer or choke loaded. This is because you can use them at normal supply voltage then. Of course you can also use them resistor loaded, but then you need a supply voltage of 700V or more. The 20A, 20B and 30A tubes are based on a very old principle, where high gain tubes have much wider Anode
