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Old 5th April 2019, 11:26 PM   #1
vkung is offline vkung  Canada
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Default ELEKIT TU-8200R

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- better protection circuit to prevent malfunction when Tube Rolling
- better coupling caps and cathode bypass cap

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Click the image to open in full size.

- You can adjust the headphone impedance
- better components
- Can use ALPS R27 volume pot

We will offer upgrade kit to upgrade to R version
Lundhal OPT option is coming....



New features
- Active automatic bias adjustment function
Other than 6L6GC that comes with the kit, KT66, KT88, EL34, 6550, etc can also be used.
- UL, Triode and Pentode output mode
- LOW ESR conductive polymer hybrid aluminium cathode Bypass capacitor
- Headphone impedance can be selected by changing the jumper location
- The protective circuit has been improved to avoid malfunction due to tube rolling

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Last edited by vkung; 26th April 2019 at 10:59 PM.
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Old 10th April 2019, 02:18 PM   #2
vkung is offline vkung  Canada
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Old 10th April 2019, 03:00 PM   #3
paczeltf is offline paczeltf  Hungary
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Quote:
Originally Posted by vkung View Post
Revised TU-8200R will be demo in AXPONA

New features
- Active automatic bias adjustment function
Other than 6L6GC that comes with the kit, KT66, KT88, EL34, 6550, etc can also be used.
- UL, Triode and Pentode output mode
- LOW ESR conductive polymer hybrid aluminium cathode Bypass capacitor
- Headphone impedance can be selected by changing the jumper location
- The protective circuit has been improved to avoid malfunction due to tube rolling

The first two features exist in the original model, has there been any change here?

The third one is included in the DX upgrade package.

The last two are really useful changes. The original model is optimized for high impedance headphones, and quite a few owners including myself had to replace FETs because of output tube failure.

Is the OPT the same?
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Old 10th April 2019, 04:30 PM   #4
vkung is offline vkung  Canada
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It is a completely new design. I would say they are new features. Also the cathode bypass cap is an option before.

I am thinking to offer upgrade kit for existing TU-8200 owner. Maybe Lundahl OPT and Takman 2% options.

Last edited by vkung; 10th April 2019 at 04:43 PM.
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Old 10th April 2019, 06:35 PM   #5
paczeltf is offline paczeltf  Hungary
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The stock OPT is reasonably good for headphones but a bit smallish for speakers so I would not hesitate ordering the Lundahl upgrade. I have already made a decent amount of upgrade to my TU-8200 as I wrote in a separate thread, and the OPT upgrade would be the cherry on the cake.
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Old 26th April 2019, 06:33 AM   #6
vkung is offline vkung  Canada
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Join Date: May 2005
Location: Vancouver BC Canada
Click the image to open in full size.
- better protection circuit to prevent malfunction when Tube Rolling
- better coupling caps and cathode bypass cap

Click the image to open in full size.

- You can adjust the headphone impedance
- better components
- Can use ALPS R27 volume pot
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Old 28th April 2019, 06:39 PM   #7
paczeltf is offline paczeltf  Hungary
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Can the new UNIT-2 be used in the original amp? They seem compatible. For the non-tube rolling maniacs, the flexible headphone output is the biggest benefit of the upgraded model over the DX version.

In regard to the OPT - a few years ago you had tried a couple of options but ran into some issues. Has that been solved?

upgrade OPT for TU-8200
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Old 28th April 2019, 08:16 PM   #8
vkung is offline vkung  Canada
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yes.. the upgrade will include UNIT 1 and 2
Lundhal OPT is one of the options around September
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Old 28th April 2019, 08:59 PM   #9
paczeltf is offline paczeltf  Hungary
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Thank you. The UNIT-1 has significant number of components and many owners have installed expensive caps or other parts, all of which would require desoldering (or purchasing again).

Is it possible to upgrade the UNIT-2 only? That one has just a few components for the headphone output and the global negative feedback.
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Old 28th April 2019, 09:26 PM   #10
vitaLee is offline vitaLee
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Is ELEKIT TU-8200R a new revision of the amp that's going to be offered from Elekit (globally) or we're talking about an upgrade kit that's offered by you @vkung?
Are you aware of any timeframes of when it's going to be available to purchase?
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