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In Reply to: RE: Venturing into SET active system. Does a 45 have enough power? posted by LewinskiH01 on August 22, 2016 at 11:41:53
IME, the 45 will be enough and is a good fit for the midrange and upper range. However the 45 could not provide enough dynamics for my tastes even with my 100+ dB horn speaks. I like the JJ2A3 better. Also, I would prefer a 2 amp system with solid state on bottom and tubes on top to keep things simpler but again....just my preference.
Have fun and let us know how it turns out.
Jim
Follow Ups:
Hey Jim.
Thanks for the input. Yes, dynamics are a concern. In fact that is what's mostly behind my question around whether they have enough power for the job.
People have commented about the sensitivity of the driver, but not about the impedance. I'm puzzled. It is my understanding the SET amp develops a certain amount of power at certain voltage, so using a 12 ohm 104dB/W driver should be better for dynamics than an 8ohm 104dB/W driver. Right?
"12 ohm 104dB/W driver should be better for dynamics than an 8ohm 104dB/W driver. Right?"Nothing sets in stone here! Depends on your speaker's true impedance curve, the amplifier circuit, transformer load to the output tube matching and the Output transformer's true impedance ratio.
This requires try and true approach and listen to the speakers at different tap. Generally, a higher impedance 16ohm tap will provide almost twice the voltage of the 8ohm so it sounds louder so it may sound a little more dynamic at the same amount of volume at 8ohm but some music may suffer.
And depends on the type tube and and the amplifier circuit, using the wrong impedance tap for a long period of time may shorten the output tube life due to the more stress placed on the output tube. And people have to wonder why they need to retube often?
45 has a really good tube life for normal use!
.
.
.Thou shall not stand where I type for I carry a bottle of Certified Audiophile Air and a Pure Silver Whip.
Edits: 08/26/16
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