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Think hybrid

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Where output stages go beyond what can be done with nice triodes like the 300b, 2a3 etc (or 845, 813 etc if you like high voltages), I think it's time to look at a hybrid. There's the Moskido thread over on DIY Audio which gives you all the info to build one. And a possibly more interesting route still is the "hypex hybrid" thread there. You buy a fairly cheap digital output stage and bypass the opamp input. You then replace it with a high quality tube circuit. Best option - DHT input tubes like 26 to 4P1L finishing in a push pull transformer like the LL1689 in 4.5:1 stepdown. But any kind of tube stage that will drive 1.8K inputs will work.

I have no more patience for huge boatanchor tube amps - just seems a wasteful and very expensive way of doing something which can be done in a cheaper and simpler way. The quality is in the input tubes and circuitry anyway.

Andy


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  • Think hybrid - andy evans 04:55:36 03/20/12 (0)

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