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57.66.65.3
In Reply to: RE: 101D amp schematic. The aim. posted by iodemus on September 22, 2014 at 12:36:33
I think you will be hard-pushed to get anything like 400-700mW out of a 101D . I was under the impression these were only good for around 250mW hence my comment regarding the intended design goals . There is also microphony , which can be a major issue with using HE speakers with DHT amps
Al
Follow Ups:
Al,
I think you are a little pessimistic now.
Here is a link where you can read about the Yamamoto amplifier.
Johnny
Yamamoto-san says :
'With this output power, since it seemed that it is too small, we decided to apply somewhat higher voltage to this vacuum tube'
Thrashing the poor things nutless , tennis balls like this need treating with respect . There are better valves to use as output stages , also running RL=Ra is a good way of generating excessive 2nd harmonic .
I have used 3A/141A which is STC's ST version of the 101D . It's best suited to line stage use
Al
Those power specs, .69 and .63 watts, are at 10% distortion not the usual 5%.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
10% distortion !!
My first transistor amp fifty years ago had only 0.01%.
So sad I scrapped it, I could have saved hundreds of dollars.
Thank you for that information.
My point was only about power.
Not about sound.
When we think of a 45 we think 2 watts at 5% distortion.
A 2a3, 3.5 watts 5%.
A 300b, 8 watts 5%.
I think Al is right when he said "I think you will be hard-pushed to get anything like 400-700mW out of a 101D" at least not at 5% distortion.
Take this info how ever you want to.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
1/4 watt at 5% 2nd HD, 1.4% 3rd.
If 1/4 watt is all you need, I'm sure it's a great tube.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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