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Old 16th August 2009, 03:33 AM   #11
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I made a few mods to the circuit and managed to reduce the power consumption by half. It's still a power hog, and I have a bit of studying to do before I can improve further. Sim specs are good: 2nd harmonic at 4.5 watts = 0.0002%. 3rd harmonic = 0.1%
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Old 16th August 2009, 04:20 AM   #12
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Quote:
Originally posted by carpenter
The 3055 is easy to locate, the LU1014D is a bear to find at a reasonable price. The 3055 can be replaced with another bipolar, the power jfet can't.
I have lots of them. How many do you need?

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Old 16th August 2009, 04:33 AM   #13
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I don't like curve 4: http://pdf1.alldatasheet.com/datashe...C/LU1014D.html

However, 24V breakdown may be not a problem, if to use them in cascodes.

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Old 16th August 2009, 07:31 AM   #14
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Quote:
Originally posted by Nelson Pass


I have lots of them. How many do you need?


You really are a sweetheart of a guy...

I have a small stash, but over time, it will become depleted. When I'm empty, perhaps I can purchase from you if you still have some in stock.

In the meantime, if there's anything I can do for you... I'm a very good carpenter with a Sprinter van loaded with tools.
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Old 16th August 2009, 07:35 AM   #15
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Quote:
Originally posted by Wavebourn
I don't like curve 4: http://pdf1.alldatasheet.com/datashe...C/LU1014D.html

However, 24V breakdown may be not a problem, if to use them in cascodes.


Are you referring to the top trace, or the bottom? I'm following the bottom curve as much as possible. Like Nelson mentions, it has a concave character that resembles a triode.
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Old 16th August 2009, 06:09 PM   #16
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Wavebourn,
Quote:
Why not? 2N3055 are used as single ended emitter follower, so no "transistor sound" can be made such a way.
Although no serious crossover artifacts, still considerable high order harmonic and IM distortion is created (even with more linear and much faster bipolars than 2N3055). You get closer to the tube sound with FETs.
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Old 16th August 2009, 06:49 PM   #17
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Quote:
Originally posted by Lumba Ogir
Wavebourn,

Although no serious crossover artifacts, still considerable high order harmonic and IM distortion is created (even with more linear and much faster bipolars than 2N3055). You get closer to the tube sound with FETs.

People seem to love the sound of the original JLH Class-A amplifier...
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Old 16th August 2009, 06:50 PM   #18
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Quote:
Originally posted by Lumba Ogir
Wavebourn,

Although no serious crossover artifacts, still considerable high order harmonic and IM distortion is created (even with more linear and much faster bipolars than 2N3055). You get closer to the tube sound with FETs.
Depends on many circumstances. Why do you think in FET output stages I prefer to use BJT current mirrors?

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Old 16th August 2009, 08:19 PM   #19
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Maybe a compound circuit, such as the attached, could be used to replace the LU1014.
It should still keep its JFET sound.

Don't use the circuit as shown, I just used any parts.

Cheers

Tim
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Old 17th August 2009, 07:02 AM   #20
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I hope the revived amplifier i am working on, a Sony TA-N7B will sound that good as their owners say. It has an hybrid bipolar/Vfet output stage, and a very nice (DC coupled) circuit wth current sources and so on.


Click the image to open in full size.

To get that tube like sound maybe try those obsolete Sony Vfets. On ebay there is on this very moment an auction for 30Eu a piece, not that bad for new Vfets.

http://cgi.ebay.nl/ws/eBayISAPI.dll?...m=220383471581

Hitachi 2sj50's remakes are priced around the same now.
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