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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: IT transformer for 2-stage SE amp posted by RHone on May 15, 2014 at 15:06:46:
I have had a lot of experience with the "D3a type" pentodes, triode-connected, as drivers, both SE and PP. That means D3a, 6J9P, 6J11P, 6J49P, and 6J52P. In most of the applications I've found that something like 175-200VDC on plates and 12-15mA makes very good sound in combination with the LL1692A. I typically use them without significant step-up, to ensure low impedance drive, but I don't quibble about the +0.6dB of 3.5:4! :=)) These are under appreciated tubes that deserve more use, especially the Russian ones that are so inexpensive and rarely microphonic (unlike the costly D3a).
I've not fared as well with the 6E6P sonically, although I didn't use it with fixed bias as Romy "the Cat" insists it must be used. He's right more often than most DIY posters, so that tube bears another trial sometime in the future.
Kevin Carter
K&K Audio
www.kandkaudio.com
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Follow Ups
- RE: IT transformer for 2-stage SE amp - KevinC 16:48:03 05/15/14 (3)
- 6E6P - Maxamillion 05:43:27 05/17/14 (1)
- PS: Cree SiC Schottky Diode Bias - Maxamillion 06:59:58 05/17/14 (0)
- RE: IT transformer for 2-stage SE amp - RHone 17:30:31 05/15/14 (0)
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