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In Reply to: RE: Tubes more powerful than the 6550 posted by akltam on December 20, 2012 at 05:18:46
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
Follow Ups:
"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."
Kevin,
I've kept my mouth shut since you mentioned this power transformer to me in person back in October... but is it too soon to ask when you expect this to be for sale and how much you expect to be selling it for?
I want one.
Ben
Such admirable restraint! I should have them by the end of next week. I haven't really thought carefully about a price, but there will be two-tiered pricing, one for ST-70 upgrade kit owners and a higher one for everyone else. You. of course, are in the former category.
Kevin Carter
K&K Audio
www.kandkaudio.com
Kevin,
This is a most excellent bit of news. In addition, have you made further headway in developing a drop-in replacement timer for the 5AR4? Just curious. Have a most pleasant holiday!
-Richard
I have a time delay relay available right now for the ST-70 upgrade. Check it out on the Power Amplifier page.
Even better, though, is that I have the first batch of the small/medium Lundahl transformer enclosures on the way. These will house LL1682/PP or LL1663/PP (and LL1660 sized transformers for other purposes) and fit in place of the Dynaco outputs. When I get mine, I will retrofit my ST-70 with LL1682/PPs and take pictures to show how to do it.
Kevin Carter
K&K Audio
www.kandkaudio.com
I need to check the website more often! Thanks!
-Richard
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