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RE: Tubes more powerful than the 6550

If you want to operate your output tubes at or near the 100mA bias current point, which your power transformer and output transformer will support without a problem, you will need to change to KT-120s. I recommend operating at the higher bias point, because it sounds better.

The new ST-70 compatible power transformer will have dual 120VAC primaries, and 840VCT @ 475mA (with tap), 2 x 6.3V @ 4A, and 5.0V @ 2A secondaries.

A larger core for higher voltage/current Lundahl power transformers does exist, but the transformer would likely cost over $350 each. That will limit the sales severely, so I'm not sure it's worth it.

Kevin Carter
K&K Audio
www.kandkaudio.com


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