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Old 20th May 2016, 02:31 AM   #1
jfetter is offline jfetter  United States
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Default hybrid output

I finished preamp:
Simple discrete Sziklai pre

now workin on hybrid output.

Did some searching and considering something along this topology.


opinions? good bad ugly ?
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Old 20th May 2016, 03:23 AM   #2
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I have done something similar in my most recent headphone amp using the 6418 and ZVP3306 with a ZVN3306 sitting on top as a mu follower (discovered the circuit myself somewhat by accident last fall, though its topology was probably known before). It simulates very well with these parts, but I've not successfully generalized it with other combinations of tubes and MOSFETs. Seems some playing with settings is required to get it to settle down. At any rate, the amp works great with the 6418 and 3306's, and I just posted pictures today of my completed build.

Is that your circuit, or did you find it in a reference book? I've been wondering where to look to determine if I had reinvented the wheel...
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Old 20th May 2016, 03:28 AM   #3
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Quote:
Originally Posted by jfetter View Post
I finished preamp:
Simple discrete Sziklai pre

now workin on hybrid output.

Did some searching and considering something along this topology.


opinions? good bad ugly ?
I used similar topologies. However, some measures for stability of the working point have to be taken.
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Old 20th May 2016, 04:37 AM   #4
jfetter is offline jfetter  United States
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its an old expired patent. look like could be easy to improve. add gain etc.


https://www.google.com/patents/US302...0IAV0Q6AEIHDAA


.
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Old 20th May 2016, 05:08 AM   #5
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I've had success using something like this for the input section of a SET power amp. My breadboard version uses a 6J6 twin-triode diff amp, an NPN constant current load for the PNP gain stage, then a BJT Sziklai pair buffer driving the power tube in class A2. I don't use the diode. Distortion at closed-loop gain of 100+ and 90Vpp output is below the FFT mud in a good Tek scope, so better than 50dB down.
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Old 20th May 2016, 07:54 AM   #6
Elvee is offline Elvee  Belgium
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Here is a possibility, using modern components:
A new hybrid concept: C-Vac
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Old 20th May 2016, 08:29 AM   #7
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Here was my version when breadboarded...
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Old 20th May 2016, 08:34 AM   #8
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Making a prototype, 10W per channel SE hybrid amp...
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Old 20th May 2016, 12:31 PM   #9
Bigun is offline Bigun  Canada
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A tube amp with a heatsink on the back - just don't look right to me !
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Old 20th May 2016, 01:49 PM   #10
jfetter is offline jfetter  United States
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here is another with low voltage supply for output section and high-voltage for driver valve.

i've started on it now .
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