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Old 7th March 2014, 12:44 PM   #161
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Hi pbtoko,

It sounds like you live in Japan. Are you able to read Japanese? I'm wondering because it sounds like there has been a lot of forum activity on the TU-879S in Japan so it would be really great if someone were able to tell us what kind of ideas and discoveries people there have made about improving the amp.

Best regards
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Old 7th March 2014, 02:42 PM   #162
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unfortunately no i do not speak or read japanese but google translate helps a lot I beleive Vicktor of VK music posted a couple of threads and essesentlly i've been rolling tubes and caps upgradeing resistors basically trying to understand what i got here before i start another project. i will post any i find later but i think basically this forum seems to have the tweeks down a lot is local availability and what fits! damn those 100uf 400+V foil caps... i am finding more each day
a company Amtrans sells a couple of upgrade kits on Amazon.co.jp they seem make their own high end audio componites such as resistors and foil caps i have bout a few resistors and some better electrolyc caps but not tried their kits which go for 30 or 4 $ plus shipping. Not sure if they ship out of japan through amazom but the do via the website, oh i guess i shoudl say i am a total newbe at this (more dangerous then i know)
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Old 19th April 2014, 08:16 PM   #163
MickRS is offline MickRS  Netherlands
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I'm busy designing new speakers. And to determine the Qtc of the cabinet and filter I would like to know the output impedance of this amp. Does anyone know? Would be very much apreciated!
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Old 26th February 2015, 08:38 AM   #164
MickRS is offline MickRS  Netherlands
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Although everyone seems busy with the successor of this little amp, I tought I'd share my latest upgrade. While thinking about a nice coupling-C, I ended up using the Intertechnik Audyn True Copper. Just two of these, leaving out the first pair of coupling caps (c1 & c2).

The difference is simply amazing! So much more detail and space. Now I know that the old plastic caps really sound plastic... Highly recommended!

Next will be the power cap. And I know that the Mundorf is the save way, but I'm thinking of the Audionote Standard capacitor. Might even fit under the pcb...
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Last edited by MickRS; 26th February 2015 at 08:42 AM.
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Old 27th February 2015, 07:16 AM   #165
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Default Amazing little beast

I am glad to see someone else loves the 879 as much as i do, my only regret is not buying two when i had the chance.

i recently had the opportunity to test my build in a audiophiles sound room, comparing it to a pair of marantz 2's the 879 held it own (within limitations 8 watts vs 34) and a few other things)) witnessed by Stig & Jon the "Lyra Guys" of course passing it through a vintage Lyra Connoisseur 4-2L SE pre amp and phono stage was not wasted. lets put it this way i was not embarrassed, even a little impressed it held up so well.

aside form a pair of v-caps i have upgraded resistors added a TKD stepped Attenuator (outside the box disconnecting the original built in one) , i did upgrade the power caps with some slightly better ones of the same design)

the next phase is to do a point to point re wire in a case big enough for some good old school caps. Mumfords, would be great but for now i woudl give something else a try if i can find some that fit.

see pix little beast on the floor next the marantz 2 (with Phillips el34's xf1's and without tubes infront of the speakers.

keep in touch let me know how your power caps fit and more importiany sound.
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Last edited by pbtoko; 27th February 2015 at 07:33 AM.
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Old 3rd April 2015, 09:01 AM   #166
MickRS is offline MickRS  Netherlands
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Yesterday finally the second converter arrived. But they have sent me one lokking different from the first one...

At least it works... Bit smoother already than the stock tubes. And quite heavier on mid bass. Which is good, as this amp is used for a 8" fr to play from 150hz up. The bass is taken care for by two OB Eminence Alpha's 15". The transition from woofers to FR is a lot better now!
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Old 3rd April 2015, 04:20 PM   #167
vkung is offline vkung  Canada
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"Btw Viktor, people are asking me if the transformers are up to the task with the 807's. Wouldn't it run too hot?"

I have not encountered any issue to use RCA 807 with TU-879S.
Your TU-879S looks good..
TU-8200DX with Amtrans carbon resistor set is my killer amp.
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Old 4th April 2015, 10:14 PM   #168
MickRS is offline MickRS  Netherlands
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I know you can change this amp to triode mode. But I do not know exactly how...

Has anyone done this? I understand that its successor has a bit less bass, but great mid range in triode mode. And since I'm using it from 150hz up, I can imagine that this could be the way to go for me.

Viktor, could you tell a bit more about the differences in triode mode vs its standard penthode mode? Would be much appreciated!

Oh, and these 807's start to sound better and better!!!
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Old 4th April 2015, 10:21 PM   #169
vkung is offline vkung  Canada
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[QUOTE=MickRS;4282673]I know you can change this amp to triode mode. But I do not know exactly how...

Has anyone done this? yes.. A lot of hum.

I understand that its successor has a bit less bass, but great mid range in triode mode. And since I'm using it from 150hz up, I can imagine that this could be the way to go for me.





Viktor, could you tell a bit more about the differences in triode mode vs its standard penthode mode? Would be much appreciated!

The Triode mode has half of the output of UL. If I use it for Headphone, I will change to Triode mode. I prefer UL for speakers. I will forget Pentode mode. I use TU-8200 to drive my proac 2.5. There is a lot of real music.
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Old 4th April 2015, 10:31 PM   #170
MickRS is offline MickRS  Netherlands
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Thanks!

Is it possible to change the 879s to UL? Or triode mode? Half the output is not an issue with my set up, as it only drives a reasonably sensitive FR driver which doesnt have to do bass...

Edit: Sorry, I see that it will give a lot of hum in triode mode...
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