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In the Forum: Melquiades Amplifier
In the Thread: Single-stage Melquiades vs. DHT amps

Post Subject: One stagePosted by nl on: 12/3/2008

Given that you are using a solid-state preamp with presumably lots of driving power, you might consider a 1:4 stepup and use of either an EML 20B tube or the AVVT AV8 tube. That might get you enough gain. I think Rankin used the 20B in his Mercury amps. The 20B would take a rather special output transformer, as it has an Rp of 3200. I think Rankin used a parafeed output here. A typical 5K:8 OPT could also work, on the 16 ohm drivers, as the reduced inductance is not so much a problem since it would be used above 600hz. The AV8 is somewhat more forgiving, with an Rp of 1500. The new TJ PX25 has a gain of 8 and an Rp of 1500, another possible choice here.

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