Super Triode Connected Aleph CCS Zen Amp - diyAudio
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Old 3rd February 2016, 06:22 AM   #1
FYC is offline FYC  Hong Kong
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Default Super Triode Connected Aleph CCS Zen Amp

Hi All

I am thinking about building an experimental amplifier employing a Super Triode Connection (STC) with a Zen amp + Aleph CCS. The STC was discussed rather in detailed in some Japanese audio website and also in TubeCAD. Employing the concept laid out in TubeCAD around mid 2015, I combined a Zen Amp (with Aleph CCS) and draw up the schematics. The working point that I selected was based on the components available in my parts inventory. I would like to ask the help from the forum to see if there are obvious miss in the thought before attempting to build one. Thanks.
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Old 3rd February 2016, 09:10 AM   #2
Zen Mod is offline Zen Mod  Serbia
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maybe because still didn't get my morning coffee , but I can't see how's that going to work
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Old 3rd February 2016, 01:27 PM   #3
FYC is offline FYC  Hong Kong
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Zen Mod, you hit the right spot. I do not understand this also, hence I call it an experimental build. Nevertheless the claims made by the concept are so attractive that I am willing to spend the effort to experiment.

According to the claims, the triode is NOT part of the gain stage, but an active feedback element. With this Super Triode Connection (STC), you get the sound characteristics of the triode but the power of the main amplifier. So in my case, I can get a E88CC (or 6DJ8) sound-like power amplifier. This is very interesting.

I basically share the concepts shown in TubeCAD
Single-Ended Amplifiers & Super-Triodes and so on in building the schematics. Also, there is even a commercial offering using a gainclone with a tube:
Nixiekits.eu Finest quality Nixie clock and tube kits made in Germany
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Old 3rd February 2016, 01:44 PM   #4
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Upon cursory inspection, this looks more like a hybrid than a super-triode.
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Old 3rd February 2016, 01:53 PM   #5
FYC is offline FYC  Hong Kong
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Hi Mike

I would argue that since the plate of the E88CC is also connected to the drain (output) of the lower MOSFET, hence this is not a typical hybrid type gain stage connection. In AC terms, the plate of the triode get signals from the amp's output as feedback.
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Old 3rd February 2016, 02:05 PM   #6
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Whatever you say, FYC. Seems like you've got it all figured out.

Append:
On second look, I'll buy it. Build away
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Last edited by Michael Rothacher; 3rd February 2016 at 02:23 PM.
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Old 3rd February 2016, 02:27 PM   #7
Zen Mod is offline Zen Mod  Serbia
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it could be supertriode amp , if you didn't omit entire biasing circuit for lower mosfet

this way , all you could get is poof! in speaker
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Old 3rd February 2016, 08:11 PM   #8
indra1 is offline indra1  Indonesia
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Quote:
Originally Posted by Zen Mod View Post
it could be supertriode amp , if you didn't omit entire biasing circuit for lower mosfet
this way , all you could get is poof! in speaker
Why? I believe FYC took the schematic from art_zv2.pdf. I think some of us would need a bit more explanation. Is it because he used 47k instead of 4k7? But I just can't figure that as valid cause for a poof!
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Old 3rd February 2016, 08:17 PM   #9
Zen Mod is offline Zen Mod  Serbia
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as Mr. Broski said cleverly:

Quote:
Wait a minute, John; what happens if the triode's cathode voltage isn't high enough to turn on the MOSFET; or too high, so the MOSFET over conducts and melts?

The answer is we need an auto-bias circuit to set the MOSFET's idle current flow, such as the one shown below.
and then he put this picture :

Click the image to open in full size.

so , find that part on page , read and think
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Old 3rd February 2016, 09:25 PM   #10
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Quote:
Originally Posted by Zen Mod View Post
maybe because still didn't get my morning coffee , but I can't see how's that going to work
I see the logic of it - the Mosfet is driven by a Triode Cathode follower, and
negative feedback is provided by connecting the output (Mosfet Drain) to
the Plate and working the Triode characteristic of the tube.

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