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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: RE: Interstage transformer to 600R recommendation needed posted by KevinC on December 6, 2013 at 12:44:24:
Hi Kevin,
Thank you.
Actually, I wasn’t aware that the reflected impedance ratio is SQRT of the turns ration.
Thus, LL1892A Alt. Q with turns ration of 3.5:1 will reflect 600R on the secondary as 7.35K load to the tube, which isn’t bad at all.
The D3a will run at either 18mA or 22mA, with plate supply voltage is to be determined. (I will decide it, based on the final circuit bias point and plate current).
I believe that the static resistance of the primary in Alt. Q is 690R (two C windings in series). Is that correct?
What is the approximate inductance of LL1892A/18mA in Alt. Q connection and what the approximate inductance of LL1892A/22mA in Alt. Q connection?
While I’m at it, is there a way to calculate the LF attenuation, knowing the tube’s internal impedance and the primary inductance?
Alternately, how can I estimate the LF attenuation in each case?
The answer to the above question will also be part of the answer to my second question below, since I may use a preamp with 6V6 @ 22mA and not E55L @ 55mA. At the moment I’m considering both options.
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Follow Ups
- RE: Interstage transformer to 600R recommendation needed - Joshua_G 13:37:02 12/06/13 (7)
- RE: Interstage transformer to 600R recommendation needed - KevinC 15:44:11 12/06/13 (6)
- RE: Interstage transformer to 600R recommendation needed - Joshua_G 10:35:47 12/07/13 (3)
- RE: Interstage transformer to 600R recommendation needed - KevinC 16:51:06 12/08/13 (2)
- RE: Interstage transformer to 600R recommendation needed - Joshua_G 04:11:49 12/09/13 (1)
- RE: Interstage transformer to 600R recommendation needed - KevinC 04:26:48 12/09/13 (0)
- RE: Interstage transformer to 600R recommendation needed - Joshua_G 16:34:45 12/06/13 (1)
- RE: Interstage transformer to 600R recommendation needed - KevinC 05:45:43 12/07/13 (0)
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