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Skywave · 16th Sep 2006, 1:40 am

If you take sensible precautions with the HT, a pair of TT21 in push-pull (class AB1) should look impressive. And deliver a fair few watts as well. Mind you, you'll have to do a bit of experimenting with anode and screen voltages to get a reasonable impedance match to any existing O/P transformer, since these bottles were originally designed for power RF applications up to about 10 Mc or thereabouts.

Just a thought.

Al.

16th Sep 2006, 1:40 am	#19
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: output valve choice If you take sensible precautions with the HT, a pair of TT21 in push-pull (class AB1) should look impressive. And deliver a fair few watts as well. Mind you, you'll have to do a bit of experimenting with anode and screen voltages to get a reasonable impedance match to any existing O/P transformer, since these bottles were originally designed for power RF applications up to about 10 Mc or thereabouts. Just a thought. Al.