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Old 1st August 2012, 04:35 PM   #101
vkung is offline vkung  Canada
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Hi Pat
I posted this thread in DIYaudioprojects to alert TU-879S customers. The original R-core is pricy.
If you can email me the photo of your R-core, I can tell you.
The original R-core is made in Japan and without multi voltage tap.
Thanks
Victor
DIY Audio Projects Forum • Elekit TU-879S (SE 6L6GC) Tube Amplifier Kit Build Notes

Pat[/QUOTE]

Last edited by vkung; 1st August 2012 at 04:40 PM.
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Old 13th October 2012, 05:06 AM   #102
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Well, I'm pleased to say that my TU-879S has been in service for over a year now in our family room, which is the most used room of the house. I have the TU-875 preamplifier connected to it, mostly for the phono preamp, but also because the sound of TU-875+TU-879 together just sounds great to my ears - rich and lovely. I am using the new Wyred4Sound uDac and Squeezebox Touch as a digital source, Zu Audio Omen speakers and a REL B3 subwoofer. The amp and preamp have been working flawlessly since I complete the builds over a year ago.

Anyone who wants to build these great kits should not hesitate. They are fun to build, sound fantastic and perform well beyond their price points.
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Old 15th January 2013, 04:09 PM   #103
rondr is offline rondr  United States
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Thanks Victor,

I finished my build a week ago and now have a few hours play time on it. The stock tubes sounded real nice but I couldn't resist trying something a little different. I run across a few Telefunken smooth and ribbed long plate 12AX7s and settled on the smooth plate. The 6l6 blackplates are US made Groove Tubes and actually sounded pretty good so I decided to keep them in for awhile. Lovely blue glow coming off those tubes. Thinking of changing the orange LEDs on the driver tube to blue ones.
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Old 15th January 2013, 04:21 PM   #104
vkung is offline vkung  Canada
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you can try a pair of RCA 807
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Old 19th March 2013, 05:15 PM   #105
Mike B1 is offline Mike B1  United States
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Default Great Amplifier!

Here's mine;

Click the image to open in full size.

I switched the amber LED's to blue.

Driving a pair of Tang Band W8-1772 in DIY vented boxes.

Click the image to open in full size.

Tryed KT-88, but ran too hot. Went back to stock EH. Then tried Sovtec 12AX7LPS and that sounded good. Nice and smooth. The last roll I did was Genalex Gold Lion 12AX7 (long plate) and the new Tung Sol 7581.

Click the image to open in full size.

I am staying with this. The 7581 is a true pentode with nice curves. The sound is smooth, detailed and punchy. The gold lion sounds a hair better than the Sovtec, but that could just be me trying to justify the extra $30 -

Absolutely a wonderful amplifier, I listen to it every night before I go to sleep.
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Old 20th March 2013, 10:54 PM   #106
vkung is offline vkung  Canada
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DId you replace the coupling PP caps to oil capacitors?
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Old 20th March 2013, 11:57 PM   #107
Mike B1 is offline Mike B1  United States
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No, it's stock except for the blue LED's and a 68 ohm series resistor because the blue has a higher voltage drop than the amber.

That and the tubes.

Give the TungSol 7581 a try if you haven't, I like it. Not expensive either like SED.

I don't think I will be doing any cap changes anytime soon. Don't want to open it up if it ain't broke -
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Old 21st March 2013, 05:15 AM   #108
vkung is offline vkung  Canada
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The oil caps is a major upgrade for TU-879S. I like RCA 807 more
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Old 21st March 2013, 06:01 PM   #109
Mike B1 is offline Mike B1  United States
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OK, I ordered up 4x .1uF 400V paper/oil caps from some guy in Russia off ebay. I can tell you though that I'm in no hurry to install them.

But I'll have them for a rainey day when my project list gets smaller -
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Old 30th May 2013, 02:42 PM   #110
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hey, the RCA 807s are difficult to find...,
for the RCA 6L6s and RCA 12AX7 as suggested in the reviews i am waiting for an offer
Are the any other tube options coming close ?
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