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Old 7th August 2011, 12:14 PM   #1
Stee is offline Stee  Italy
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Default Tube's JLH hybrid solution

here there is a solid state section and tubes section
but not HYBRID section
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File Type: gif TUBES JLH.GIF (6.0 KB, 199 views)
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Old 7th August 2011, 12:51 PM   #2
Bigun is offline Bigun  Canada
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Stee,

You are a dynamo of ideas.

Well, this latest one is kind of funny because using a tube as a phase splitter is how JLH started - his design came after the Williamson tube amplifier which had a tube phase splitter. JLH made a transistor work as a phase splitter.

I'm not sure what you have is a good idea - unless you use low voltage tubes. Otherwise there is a large voltage between anode and cathode when operating most tubes in their optimal set up. In this case your design would end up with a very large voltages across the lower transistor which means quite a lot of power dissipation ?

The usual approach to a JLH hybrid is to to use a PNP phase splitter with the usual NPN power output transistors to make a unity gain follower and then drive it with a tube VAS. But the JLH is purported to sound so good that it doesn't bear much need for improvement ?
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Old 7th August 2011, 02:09 PM   #3
Stee is offline Stee  Italy
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Default Thanks a lot

The detail provided by the valve is impossible to achieve with the bipolar
it is typical to use them as preamps
The final transistor should be quasi-complementary (see modern trend link)
so this should provide an ideal sound mixing
you help me?
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Old 8th August 2011, 05:36 PM   #4
Bigun is offline Bigun  Canada
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If you want a tube driven quasi-complementary hybrid you might look at this:

http://www.wimdehaan.nl/downloads/te...lnishiki41.pdf
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