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Old 20th June 2018, 03:51 AM   #1
nebulous9 is offline nebulous9  United States
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Join Date: Aug 2012
Default Several months now with TU-8600

As the title says I've been running the TU-8600 amp for many months to power the highs of a pair of Von Schweikert VR4.5 . The lows are powered by a Halo A21.

The sound I'm hearing is just amazing. So many layers of warmthness along with so many layers of beautiful sound, that's all I can describe it,really. Just a real, natural, big sound.

Before the TU-8600, I was running the TU-8200 for the highs. That too sounded great, but the TU-8600 sounds bigger. And before the TU-8200, the A21 powered it all. That sounded good too but it didn't have the tube wamthness.

Its been a great several months now with the TU-8600. I opted for all the upgrades. Victor was my mentor, really. He helped me out with everything and even called me to congratulate me with the completion of the amp.

I guess the next step would be to buy another TU-8600 to power both the highs and the lows with pure tube power

Thanks to Mr. Fujita for this wonderful creation and Thanks to Victor for helping me with the build and great upgrades.

Click the image to open in full size.

Last edited by nebulous9; 20th June 2018 at 04:00 AM.
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Old 20th June 2018, 09:50 AM   #2
jama is offline jama  Spain
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Join Date: Jun 2004
Location: Cartagena, Murcia
Default Wonderful amp

Hi, I accords to you too. I am very happy with the amp. But I have found one problem recently. I changed the 300b from Gold Lion to ELROG 300b. Really I noted all better but here is problem. The filament of one channel light on one second, later power off another second and finally power on (I interchange both tubes and the same resul). Exploring a few (with a scope) I found that optocoupler that set the enable signal of voltage regulator has this behaviour.
Using the original tubes the fact is the same but because filaments are differents is not visible, but I got the same scope capture.
Something knows why this strange behaviour?
This little power off can reduce life time of tubes?
Scope capture shown that (blue trace) led side of opto has a little drop and enable input of MIC29x has one little glitch (red trace)

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Old 20th June 2018, 09:52 AM   #3
jama is offline jama  Spain
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Join Date: Jun 2004
Location: Cartagena, Murcia
Default Wonderful amp

And in this scope capture is shown that current trought filaments (0.47 ohm) has a peak, but seems me it is good.
What do you think?
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Old 20th June 2018, 10:09 AM   #4
jama is offline jama  Spain
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Join Date: Jun 2004
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'Someone' not something...

Sorry all, sometimes spellchecker does strange things...
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Old 10th September 2018, 12:03 PM   #5
TomCharles is offline TomCharles  Austria
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Join Date: Mar 2004
Location: Vienna
Default compare to SE OTL with elrogs

Quote:
Originally Posted by jama View Post
'Someone' not something...

Sorry all, sometimes spellchecker does strange things...
With elrogs it must be close to se OTL without elrogs??
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Old 10th September 2018, 12:43 PM   #6
jama is offline jama  Spain
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Join Date: Jun 2004
Location: Cartagena, Murcia
Hi, same nebulous9 I think that this amp is really great, but this little problem maybe meaninful. I wrote to elekit and they reply me some points to check. Later discard some points, I found that my ecc82 was not totally in good state. When I changed with other, then the problem dissapear. But really this maybe a weak point in the design because one ecc82 not fully in good state (because the bad one mine really sounded very well yet) can lead two starts in the filament of 300bs in few seconds (I saw the same behavior with scope with EML and Gold Lion but it was not not visible because slow start-up, while that Elrogs has filaments light up in one or two seconds and here this problem is visible). I propose to elekit solve this little problem but I do not know if they will do it or not...
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