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Old 12th October 2012, 12:01 PM   #11
Bigun is offline Bigun  Canada
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Elvee - very nice work, I really enjoy the line of designs you have put onto the forum, it pushes the thinking beyond the usual and doesn't rely on fancy components. This one is particularly interesting as it lends itself to a hybrid design with a valve based votlage amplifier stage.
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Old 12th October 2012, 12:04 PM   #12
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as it lends itself to a hybrid design with a valve based votlage amplifier stage.
Bigun
you stole one of my thoughts
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Old 12th October 2012, 05:52 PM   #13
Elvee is online now Elvee  Belgium
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Quote:
Originally Posted by padamiecki View Post
Elvee
did you try correction error input stage like for HP version?
??? Sorry, I don't see what you mean

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Originally Posted by padamiecki View Post
Dear Elvee
I have at about 8 pcs old KD502 but no proper heatsink for them.
Is this possible to use modern TO247s?
Yes, TIP3055 or MJE3055 would be OK, as any similar transistor.
If you use faster devices, some corrections might be needed. So far, I only tried 2N3055's.
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please post some pics, maybe pcb?
Pics, in a day or two, PCB nope
Quote:
also asc file for tringlophone?
PLEASE!
Here is one version. Maybe not exactly identical to final graphic schematic, but enough to get you going and have some fun
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Originally Posted by Bigun View Post
Elvee - very nice work, I really enjoy the line of designs you have put onto the forum, it pushes the thinking beyond the usual and doesn't rely on fancy components. This one is particularly interesting as it lends itself to a hybrid design with a valve based votlage amplifier stage.
Thanks, and yes, I think so. For the moment, the VAS does its job, but it is a little... bland shall we say. Alternatives are welcome
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File Type: asc Tringlophone5d.asc (10.1 KB, 86 views)
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Old 12th October 2012, 10:07 PM   #14
Bigun is offline Bigun  Canada
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I wouldn't call anything here bland, this CFP input is very nice and perfectly suited to give good linearity, low output impedance and all keeping only local 'current' feedback

Tube input & VAS is fun and easy to do, there are lots of options available to pick from depending on what you want to achieve. You don't need a lot of gain, so a medium-mu tube would be good and if you want lowish impedance from the tube then you could choose a bottle with two triodes and use one as a cathode follower buffer. Lots of options.
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Old 15th October 2012, 06:36 AM   #15
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??? Sorry, I don't see what you mean
cross gain stage like in the file from attachment:
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Old 15th October 2012, 08:01 AM   #16
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Thanks, and yes, I think so. For the moment, the VAS does its job, but it is a little... bland shall we say. Alternatives are welcome
Elvee
you have light peak at point A at 250kHz...
the current through R1 is hm, problematic...
Attached Images
File Type: png Picture1.png (6.2 KB, 549 views)
File Type: png Picture2.png (11.0 KB, 533 views)
File Type: png Picture3.png (12.0 KB, 526 views)
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Old 15th October 2012, 08:03 AM   #17
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... and if AC=0 we got this...
the circuit needs modifications
but anyway I like it very much!
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File Type: png Picture4.png (13.6 KB, 514 views)
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Old 15th October 2012, 04:41 PM   #18
Elvee is online now Elvee  Belgium
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Originally Posted by padamiecki View Post
cross gain stage like in the file from attachment:
I didn't use that gain stage because the output swing is a bit limited for a high power tringlotron.
For headphones, it doesn't matter: the power is ample enough.

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Originally Posted by padamiecki View Post
Elvee
you have light peak at point A at 250kHz...
You are not supposed to look at point A.
It is an internal test point to be used solely by the designer.

The user may just look at the overall frequency response.
should have deleted that *$£* TP

Quote:
the current through R1 is hm, problematic...
What is problematic? The notch at ~10MHz?
It is caused by the slow OP transistors and the various additional degenerations combined with the error correction. At this frequency, the weak residual output signal becomes completely out of phase with the correction, hence the null.
Note that it is almost completely a simulation artifact: in reality, it is unlikely you could observe something that clear-cut.

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... and if AC=0 we got this...
the circuit needs modifications
but anyway I like it very much!
You should indicate the source of your graphs, things would be clearer.
I think what you show is the PSRR, see below.
In that case, no modifications are needed: it is entirely intentional.
Unlike many SE-Class A amplifiers, the Tringlophone is designed to be used directly with a raw, moderate quality supply, and doesn't need a gyrator or regulator: the PSRR over the audio band is decent, and in addition a notch is located at 100Hz to increase the ripple immunity.
Here are some pics of my prototype:
Attached Images
File Type: png TringloPSRR.png (121.2 KB, 405 views)
File Type: jpg 100_5324.JPG (222.4 KB, 263 views)
File Type: jpg 100_5325.JPG (181.5 KB, 215 views)
File Type: jpg 100_5329.JPG (291.1 KB, 221 views)
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Old 15th October 2012, 08:11 PM   #19
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...And how do you like the sound?
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Old 16th October 2012, 06:42 AM   #20
Elvee is online now Elvee  Belgium
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Originally Posted by audiobard View Post
...And how do you like the sound?
Sounds sweet and nice (do you really expect I'd say something else? Let's wait for other, independent opinions)
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