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RE: Penny wise

"The gain structure of a 2-stage S.E., using D.C. coupling, driven by a triode with an amp-factor of 100, driven into a 2A3 or 45, falls within this ideal 18-to-20 DB range."

How do you figure that?

Your driver stage has a gain of about 54 (that's about 35db) and then you have to add the gain of the output stage. You're not even following your own rules!

Or are you including the loss through the output transformer?

Even so, 18db gain would give 8 volts out for 1 volt in and 8 volts across 8 ohms is 8 watts. Your amp does not give 8 watts for 1 volt in.

Your amp gives 1 watt out for .33 volts in. That's a total amplifier gain of about 9.5 db.

".. the correct gain structure for all of these amps is now 18-20 DB of amplification."

The correct gain structure is the gain needed to get the listener's speakers up to the SPL, at the listening position, required by the listener.

Where do you get that 18-20db is somehow the only correct gain?

Tre'


Have Fun and Enjoy the Music
"Still Working the Problem"


Edits: 12/14/14 12/14/14
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