[Arran]

Mike;
The set sounds pretty good for a first power up. This model 10A is a perfect example of why single dial tuning was such a big improvement just a few years later. It also illustrates why they made such a big deal out of "screen grid" tubes, more gain, less feedback, this was why so many of these early sets had a rheostat to adjust filament voltages for each stage. I did think that they had feedback neutralizing condensers to prevent the oscillation, but maybe that was on the model 20 and later A.K and RCA sets?
The microphonic issue was also why they quit making tubes with globe style envelopes, which why it's ironic how audiophools seem to gravitate towards them, also demonstrating how technologically illiterate they are. If type #50s were really "the bomb" with high fidelity why did they replace them with #45s, 2A3s, etc.? For that matter pentodes and beam power tubes are much more complicated to make then triodes.
Regards
Arran