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Old 18th May 2020, 08:49 AM   #11
SandorS is offline SandorS
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Join Date: May 2020
Thanks Ferenc

By the way, may I ask what tubes you've considered to use and which if these you finf a good match sonically?

It appears that, 6l6gc may fit technically best, being a 6l6gc amp primarily, also that the output transformer might drop voltage should a EL34 or KT-88 be used.
My candidate is KT66 and maybe KT77.

I do not know if upgrading the transformers would help usage of the further tubes, but I'm thinking any tube including 6l6gc would benefit of it. Not sure why a 6.0 volt one is used as opposed to more standard 6.3.
Have you considered or made such update if I may?

Many thanks

Sandor
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Old 24th May 2020, 05:44 AM   #12
HarryY is offline HarryY  United States
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TU-8200 Compatible Power Tubes
I would strongly suggest you look at this thread

Some thoughts on Elekit TU-8200DX

Doing those mods greatly improved my TU-8200
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Old 24th May 2020, 09:40 PM   #13
paczeltf is offline paczeltf  Hungary
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If you look at the above mentioned thread that I opened then you will see some comments on the 6V heater voltage. It is actually not that bad, if you use it with the stock configuration then the heater voltages will be above 6V.

The KT66 is a more linear beam tetrode than the 6L6GC. I enjoyed the TAD KT66 that I had bought for a try but finally returned to RCA 6L6GC (7581A) as it sounds more organic.
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Old 25th May 2020, 02:17 PM   #14
SandorS is offline SandorS
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Thanks a lot paczeltf for the many details.

I would need to find a service to make updates in the amp, not my area of expertize at all.
I purchased my one assembled, think the only upgrade made was of capacitors.

The sound is somewhat too coloured and sweety for my taste, similar to your and some others' view.

I tried EL34 tubes too, with mixed result sonically and technically.
KT77 Saratov made is just breaking in, good initial results; between EL34 and 6l6gc, around half way. Way more bass, air and just a bit less mids. So is fine for my taste, sonically.

I'll try Shuguang Black Treasure KT66, if anyone interested can report back. I try to get sustainable source of spare tubes for the power ouput. I run NOS ecc82 Telefunken that I can only recommend, made it a different amp.
I give a try to 6550 GE ones soon, too.

Sandor
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Old 25th May 2020, 02:58 PM   #15
paczeltf is offline paczeltf  Hungary
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Hi Sandor,

The warm and sweety sound character is related more to the preamp section than to the power tubes.
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Old 27th May 2020, 09:07 PM   #16
SandorS is offline SandorS
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Hi PaczeltF,

Thanks - I played with the tubes in the preamp section and you may be right. Sounds a good idea to look at whether actually it's me creating issues in case I change a setup. Still some sweetness comes from the power tube section as I hear, or just from the whole somehow.
If I need to choose between somewhat sweety sound vs what JJ Ecc82s give, a clean but lifeless sound, I choose the first.
Is Tungsram ecc82 a linear sounding tube if I may?

I noticed my TU-8200 has no jumpers inside that'd allow to change modes UL, triode and pentode. I asked the local shop I purchased from and got confirmed they soldered the pentode mode, for some reason. Gosh.
Think will bring back to fix it. And why the pentode, if any?

I also noticed that TU-8800 looks to allow UL or triode mode.
For my education, what does UL really do? Can it really blend the good from pentode and triode modes?
The Elekit manual just says it's meant to be an intermediate mode between the two other. And sonically, can one say UL is more close to either the pentode mode or the triode?

I enjoy writing irrelevant things in a thread it does not fit to.

Well I connected my Benz Ace MC via an all valve phono stage to the TU-8200. Wow. Welcome music.

Thanks a lot.

Sandor
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Old 27th May 2020, 09:09 PM   #17
SandorS is offline SandorS
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Join Date: May 2020
Hi PaczeltF,

Thanks - I played with the tubes in the preamp section and you may be right. Sounds a good idea to look at whether actually it's me creating issues in case I change a setup. Still some sweetness comes from the power tube section as I hear, or just from the whole somehow.
If I need to choose between somewhat sweety sound vs what JJ Ecc82s give, a clean but lifeless sound, I choose the first.
Is Tungsram ecc82 a linear sounding tube if I may?

I noticed my TU-8200 has no jumpers inside that'd allow to change modes UL, triode and pentode. I asked the local shop I purchased from and got confirmed they soldered the pentode mode, for some reason. Gosh.
Think will bring back to fix it. And why the pentode, if any?

I also noticed that TU-8800 looks to allow UL or triode mode.
For my education, what does UL really do? Can it really blend the good from pentode and triode modes?
The Elekit manual just says it's meant to be an intermediate mode between the two other. And sonically, can one say UL is more close to either the pentode mode or the triode?

I enjoy writing irrelevant things in a thread it does not fit to.

Well I connected my Benz Ace MC via an all valve phono stage to the TU-8200. Wow. Welcome music.

Thanks a lot.

Sandor
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Old 28th May 2020, 10:25 AM   #18
paczeltf is offline paczeltf  Hungary
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Hi Sandor,

Quote:
Is Tungsram ecc82 a linear sounding tube if I may?
The Tungsram sounds much better than the stock Chinese 12AU7 that came with my amp, but I doubt that is because better linearity. All ECC82 types of tubes share the same specifications. You need to go with a different tube family for better linearity, which is what I did.

Quote:
For my education, what does UL really do? Can it really blend the good from pentode and triode modes?
All these modes relate to the extent of the modulation of screen grid voltage with the output signal, which creates a local negative feedback in the power tube section.

In pentode mode, the screen grid is connected to a fixed voltage with no feedback, in case of the TU-8200 it is the power supply voltage (B+). This gives the highest output power (well this is why tetrodes were invented), but also the highest output impedance and distortion in general.

In triode mode, the screen grid is connected to the anode giving 100% modulation. This will result in a triode-like characteristics with better linearity and lower output impedance, but the power drops more than 50%.

The so-called "Ultralinear mode" was invented trying to do some experiments with partial feedback rather than calculations. It turned out that about 40% modulation on the screen grid coming from an intermediate tap of the output transformer gives almost as much power as pentode mode with distortion figures being close to the triode mode. This is the preferred mode in TU-8200 as well.

There is a lot of information available on the net, search for "ultralinear mode plate characteristics".
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Old 28th May 2020, 10:51 PM   #19
Mancave62 is offline Mancave62  United States
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Location: Baton Rouge
Quote:
Originally Posted by SandorS View Post
Hi PaczeltF,

I noticed my TU-8200 has no jumpers inside that'd allow to change modes UL, triode and pentode. I asked the local shop I purchased from and got confirmed they soldered the pentode mode, for some reason. Gosh.
Think will bring back to fix it. And why the pentode, if any?

I also noticed that TU-8800 looks to allow UL or triode mode.
For my education, what does UL really do? Can it really blend the good from pentode and triode modes?
The Elekit manual just says it's meant to be an intermediate mode between the two other. And sonically, can one say UL is more close to either the pentode mode or the triode?

I enjoy writing irrelevant things in a thread it does not fit to.

Well I connected my Benz Ace MC via an all valve phono stage to the TU-8200. Wow. Welcome music.

Thanks a lot.

Sandor
I have had my Tu-8200 for several years now, I much prefer the Pentode mode and that's all I every use now. Considered soldering it in because the jumper seems so flimsy, but it works fine, so I left it adjustable. I have rolled many tubes (KT88, KT77, EL34, 6l6GC, KT66, 6550, 6ca7, 7581A). They all sound great to my ear. My favorites are the KT77, 6ca7, and what I'm stuck on now is the 7581A (6l6GC on steroids). Tube rolling is a blast, have fun!
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Old 28th May 2020, 11:16 PM   #20
Mancave62 is offline Mancave62  United States
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Join Date: Jan 2016
Location: Baton Rouge
Quote:
Originally Posted by SandorS View Post
Hi PaczeltF,

I noticed my TU-8200 has no jumpers inside that'd allow to change modes UL, triode and pentode. I asked the local shop I purchased from and got confirmed they soldered the pentode mode, for some reason. Gosh.
Think will bring back to fix it. And why the pentode, if any?

I also noticed that TU-8800 looks to allow UL or triode mode.
For my education, what does UL really do? Can it really blend the good from pentode and triode modes?
The Elekit manual just says it's meant to be an intermediate mode between the two other. And sonically, can one say UL is more close to either the pentode mode or the triode?

I enjoy writing irrelevant things in a thread it does not fit to.

Well I connected my Benz Ace MC via an all valve phono stage to the TU-8200. Wow. Welcome music.

Thanks a lot.

Sandor
I have had my Tu-8200 for several years now, I much prefer the Pentode mode and that's all I every use now. Considered soldering it in because the jumper seems so flimsy, but it works fine, so I left it adjustable. I have rolled many tubes (KT88, KT77, EL34, 6l6GC, KT66, 6550, 6ca7, 7581A). They all sound great to my ear. My favorites are the KT77, 6ca7, and what I'm stuck on now is the 7581A (6l6GC on steroids). Tube rolling is a blast, have fun!
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