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In Reply to: RE: Apples and Oranges and Peaches posted by drlowmu on June 01, 2015 at 08:49:12
Ok , maybe I got confused with that but what you suggest , even at the output termianls would be horrible on 110dB drivers . I aim for 1mV maximum at the output terminals with 97dB speakers . I couldn't manage that even with DC filaments with that amount of ripple . How quiet are your amps ? What about pentode SE ? What sort of maximum ripple would you suggest is allowable ?
Al
Follow Ups:
Hiah Al,Generally, I think building a supply for lowest hum is a mistake in a amplifier.
An amp that "plays the music to us in the music's time frame, and not the amp's time frame, with maximum possible dynamic contrasting", is the goal I seek and value the most in designs. This requirement and " lowest possible hum" are at odds with each other, design wise.
Playing back the music in music's time, is the one thing, for example, that a no-feedback amp can begin to give us.
Well, today I layed my main supply caps, and Rk bypass caps into my Type 45 amp chassis. I coated the chassis and the bottom of the caps heavily with GE Silicone II, and mated them together, so that , when cured, the DC LINK Vishay and WIMA caps will be elevated about 1/4 of an inch off the steel chassis. Caps sound better when they don't touch the chassis, and, when they don't touch each other.
BTW, that fellow Barry in London, "Smart845" that I wanted you and Andy Evans to visit and give me a report, has started a blog on audio. Check out his center tapped 45 Globes, a new design from EML.
http://smart845.blogspot.co.uk/
As for SE Pentode, I have no idea what kind of supply that needs. But I KNOW G2 has to be super stable and ideally - separate from the B+ supply, to do it right.
But, why would anyone want to build a Pentode output stage, and have two things going on at once, when simple triodes like the 2A3 and 45 exist ?? That is why I never messed with SE pentodes.
Regards and best wishes,
Jeff Medwin
Edits: 06/03/15 06/03/15
I don't know why you think that I go for minimum hum . I go for a power supply that provides acceptable hum and the best sonics using what iron and caps I have available in stock .
SE pentodes have far less immunity to power supply ripple so a power supply for a SE pentode needs to be approached slightly differently to that of a triode . As for the extra grid and feedback , so what ? If you have not experimented with SE pentodes , you should
I have told you and your creepy cheerleader this already . I don't have the time or the inclination to go and listen to someone elses amp who is a nightmare journey the other side of town .
Al
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