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Re: Best power tube made today for my new project

57.66.65.3

I have built several DC coupled PP amps . There are various problems to overcome at the design stage with DC coupled amps . The first problem with this is that the input stage now stage controls the balance and operating point of the output stage . Then there is the risk that if the input valve fails , the grids of the output stage will see the full driver B+ ! Also with DHT output stages , there needs to be a way of measuring balance , which even with perfectly matched output valves , can be screwed up by the input stage . A pot between the cathodes of the input stage can set balance but there is also the consideration of the input stage tail current , which also sets the current of the output stage . Also much higher voltages will be used , cost of the power supply would increase dramatically . So I would recommend the following for a safe DC amp : CCS under the output stage , pot between the cathodes of the input stage , output transformer with both sides of the primary brought out to allow balance measurement (instead of a centre tap) . I also prefer valve rectification as the DHT will warm up far more quickly than the input stage .


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