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drdna wrote:

The subwoofer still needs a substantial power source. Right now it is being driven by a solid state amplifier.  It would be interesting to see what impact the SET could have here if any.

I see, I did not know that subwoofer needs a substantial power source. If so then sure it might be interesting. To make from GU-48 a powerful LF DSET would not be difficult.  The output transformer will be very simple as well. The high voltage transformer for transmission tubes usually screen up HF as they need excessive high voltage isolation but for LF only DSET it would be no brainer. Make 500mA transformer with larger lamination you will be able to found and coils with 3000V-4000V isolation. I think if you find somebody why would  make it large enough to get 5Hz-7Hz at FULL POWER then it will be around 500-700 transformer. Everything else will be relatively easy if you can talk like this about an amp hat will have 1.5kV on plate. BTW, the GU-48 has high gain, so who know it might be even a single stage amp…

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