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In Reply to: RE: Unfortunately it's too later to change the impedance posted by maxhifi on November 26, 2014 at 15:22:17
Is the secondary tapped?
A 8 ohm speaker on a 16 ohm tap gives you a 2500 ohm primary.
Just thinking out loud.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
There is the extra primary inductance and better HF but the disadvantage are the copper losses of a 5k primary and the 16 ohm secondary tap which would be much higher than a 2k5:8 transformer . Sowter's 5K SE TX already has high copper losses , especially on the primary .
Al
Yes, I certainly could give that a try. The only reason I haven't gone down that path, is the transformer will be more lossy that way. Us engineers can tend to hit a mental road block when entering the "use outside of design intent" territory, I am happy for this suggestion, especially since it should have been an obvious one.
This extra transformer loss may be more than compensated for though by the tube being loaded properly and making more power. In either case this is sure easy to test.. will try it tonight and see what happens. I suspect I will get better power output and a slightly worse damping factor.
What am I missing?
Dennis/ Jeff have been criticised for suggesting a 2k5 load was suitable for the ~ 42mA 250V operating point... and that was into a pair of speakers that likely did not need a low impedance drive. Now 2k5 is considered a more suitable load than 5k?
Well, it will net you higher power... at the cost of distortion and lower damping factor, which I imagine could be an issue with your speakers (it is with most speakers). OTOH, I guess it is "proven" is Dennis' amps.
I think I need a break...
Cheers.
"In the beginner's mind there are many possibilities, in the expert's mind there are few." Shunryo Suzuki
When I said "A 8 ohm speaker on a 16 ohm tap gives you a 2500 ohm primary."
I was just saying he wasn't stuck with 5k. He could go for 250vdc 60ma. 2500 ohms for instance.
But at 250 42ma, 5k is too high (but might be fine assuming the power output is enough for his situation) and 2.5k is too low leading to high HD at all power levels.
I really wasn't trying to confuse anyone.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I am just a little (lot!) sleep deprived and therefore have pulled my cranky pants on.
Sorry, I did not mean to hassle.
Cheers.
"In the beginner's mind there are many possibilities, in the expert's mind there are few." Shunryo Suzuki
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