Yes. An Audio friend of mine works on a high performance line preamp with my 10Y / VT-25 for the moment : I wait for his conclusions now.
To my side, the tests that I made for a flea-power 1WRMS amp worked, but the results are not so amazing, compared to the stuff needed to make those 10Y operate, if only for direct direct current heating...
Tests on my bench :
View attachment 3128243
The matching schematic :
View attachment 3128244
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