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vkung 1st August 2012 05:35 PM

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.
DIY Audio Projects Forum • Elekit TU-879S (SE 6L6GC) Tube Amplifier Kit Build Notes


autoformer 13th October 2012 06:06 AM

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.

rondr 15th January 2013 05:09 PM

2 Attachment(s)
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.

vkung 15th January 2013 05:21 PM

you can try a pair of RCA 807

Mike B1 19th March 2013 06:15 PM

Great Amplifier!
Here's mine;

I switched the amber LED's to blue.

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

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.

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.

vkung 20th March 2013 11:54 PM

DId you replace the coupling PP caps to oil capacitors?

Mike B1 21st March 2013 12:57 AM

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 - :)

vkung 21st March 2013 06:15 AM

The oil caps is a major upgrade for TU-879S. I like RCA 807 more

Mike B1 21st March 2013 07:01 PM

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 - :)

miki4audio 30th May 2013 03:42 PM

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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