98.206.37.100
In Reply to: RE: Best (least bad?) misuse of LL1682 posted by KevinC on October 17, 2009 at 10:19:59
As I said in my first post, I was a bit concerned about the power loss when putting such a high load on the tube (but gaining lower distortion in the trade-off). I ran some numbers tonight and here's what I came up with:Power Out 3.16 W
into impedance 8 ohmsVoltage needed (at speaker) 5.03 V RMS
OPT pri 8200 ohms
Ratio 32.0Voltage Needed (at plate of 845): 160.97 V RMS
845 mu 5.5
845 Rp 1700
845 Gain 4.56Voltage Needed (at grid of 845): 35.34 V RMS = 99.96 V p-p
That means that with an op point of -50V bias, and an ~8k load, I can still get over 3 watts out. (FYI, the same calculations run on a 4100 ohm load yields 4.6 watts with the same -50V bias.) I was expecting more power loss, so that's a nice surprise.
Three watts is plenty for me, and I like the idea of the lower distortion. Looks like I'll go the 8K route, but I may still give a quick listen to the seriesed/4K configuration just to hear the difference.sonically.
Thanks, Tom
Edits: 10/17/09 10/17/09Follow Ups:
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