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Old 20th March 2012, 08:17 AM   #11
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by lowtherfan View Post
We had a similar discussion when i was looking for an amp to drive my 100db speakers and you recomended the simple SE amp in a Ergo chasis.
Yes, because you have around 6dB more REAL efficiency compared to the Audio Note AN-E's. The AN-E are basically 4Ohm, so real, normalised efficiency is 94dB/W/m.

Where in your case pushing the 300B towards "45" Operation and sacrificing power for finesse is a great choice, as you have much greater efficiency, your friends Speakers need something that can push a bit harder, IMHO, unless he only listens to "Girl & Guitar" Music and Baroque chamber ensembles and recorder solos...

Quote:
Originally Posted by lowtherfan View Post
He sort of fancied something along the lines of what's offered by the company who makes his speakers. I built and heavily upgraded their KIT amps before moving on to something more to my taste.
I'll see what he says. Kevin.
Audio Note Kit's has a 300B PSE Kit with 6SH7 or such pentode driver. These would probably also be a good match and offer similar power as the Lux 91. The design philosophies differ notably.

If you friend likes the Amp you have he may not like the AN Kit as much, it has a different "tuning" in sound. It is hard to describe the difference and I do not not want to sound like criticising a competitor.

Both are good but different choices for your friends Speakers and ideally your friend would try to listen to a commercial or Kit AN Amp as well before deciding.

Ciao T
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Old 3rd August 2012, 10:31 AM   #12
diyAudio Member
 
Join Date: Mar 2010
Location: Hawkes Bay
Hi Thorsten,
Took a chance on a pair of Diy Hi Fi clearance Shuguang 205D tubes.
Any Idea what might be the 'best' bias and B+ values
if fitted in the 'simple 300B amp' ?
Any idea if these valves could or should be used in a Tram 11 ?
Do you have any experiance with 'filament bias'?
ie running the filament and anode currents through a suitably sized
cathode resistor. The idea being to reduce the valvue of the cathode resistor
and eliminate the need for a cathode by pass cap.
It occured to me that i could use DIY HIFI filament supplies on say D3As
to do just this. Any thoughts, thanks Kevin.
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