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Re: the "COMPACT" ...

68.60.233.193

I picked up some 6528s based on the massive construction and specs but find linearity is poor. A triangle wave has a nice curve to both rising and falling slopes.

I've read that with a more complicated circuit and several feedback loops this tube sounds great. This isn't a good tube for simple no feedback amps.

The compact works because of the sensativity of and ease of drive of the 6BQ5. Other tubes that might work well are the 7591 and 8417.

I'd be interested in seeing how ballanced the UL design would be. Having a signal on the G2 that is effected by the other output tube might make it more ballanced than pentode operation.

Of course not bypassing the cathode resistor or CCS would increase output Z.


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