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RE: apologies ...

In my view your results are actually satisfactory having in mind that the sim does not take into account a real world transformer. It's more like "this is what you could get, now it's up to you and your choice of OPT".

Plus, 6k is more suitable and was used in the sim, and with pentodes and beam tetrodes primary impedance is more important than with triodes, i.e. there is a "sweet spot effect".

The OPTs you have used are extremely cheap and probably worse than some scavenged or recycled OPTs from old radio receivers. Just compare your results with a standard 2A3 SE amp and you'll get what I mean. Or, compaee it with other EL84 SE amps and you're going to understand why it had so much success.
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http://rh-amps.blogspot.com/

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