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Old 9th July 2021, 05:30 PM   #1
vkung is offline vkung  Canada
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Join Date: May 2005
Location: Vancouver BC Canada
Default ELEKIT TU-8900 2A3/300B

ELEKIT 2A3/300B SET AMP
Price $1475.00 ( the pricing reflects the expensive shipping out of Japan.)
TU-8900 will be available in late August 2021

Amorphous core Lundahl upgrade will be available in October 2021
We will offer this opt upgrade once we have resolved all the technical issues. Our goal is to offer the best sound and afforable OPT from Lundahl
August 1, 2021 ---> good to go...
This is our first time to offer Amorphous core OPT. I want to make sure the Lundahl amorphous core is superior than the regular C Core.
This is the sample of Amorphous Core for TU-8900.. Amorphous core requires a longer burn in time..
Is it better?? I need more time to evaluate the sound quality... If the Amorphous core is not my preference.. I will use the regular C core instead.... Please give me more time to perform the evalation..
Updated August 1, 2021----> after 3 weeks continuous Listening.... It is good to offer this option....

Click the image to open in full size.LUNDAHL Ll2785C Amphorous core
No Takman for this model - Takman is running out of material to make 2% carbon resistors.

TUBE SET OPTIONS:
COSSOR/Linlai Delux 2A3 + Sylvania 12BH7A $365
COSSOR/Linlai Blackplate 300B +Sylvania 12BH7A $345
COSSOR/Linlai WE300B +Brimar 12AU7 $$625
Western Electric WE300B (5 Years Warranty) + Sylvania 12BH7A $1,525
ELROG 300B + Sylvania 12Bh7 $1280
ACME 300B + CV4003/12AU7WA $825.00
COSSOR/LINLAI Delux metal base 2A3 $285
COSSOR/LINLAI WE2A3 $385

If you buy TU-8900 with LL2785C and Western Electric 300B, the Cossor/Linlai Delux 2A3 is free

COUPLING CAPS 100nF 450V x 2 (VCAP CuTF $190 or ODAM $100)
Cossor/Linlai WE2A3
Click the image to open in full size.Cossor/LinLai WE2A3

Click the image to open in full size.Cossor/LinLai 2A3 deluxe metal base

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LEFT - TU-8600S (Metal Tube Cover and metal knob), RIGHT - TU-8900 (Plastic Tube Cover, plastic knob)
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Matching headphone impedance/volume levels.

You can change the headphone impedance/volume levels by
simply removing the front panel and change the position of a
short pin.


Click the image to open in full size.
Directly-heated triode tubes like the 300B and 2A3 enjoy an enduring popularity among audiophiles. The 300B with its rich midrange and extended bass- and 2A3 with its delicate expression and gentle tone offer a very special sonic experience. These 2 tubes are similar in appearance but very different in characteristics and can both be used in TU-8900 without any special changes in amplifier settings. Many manufacturers are producing 300B and 2A3 tubes so users can enjoy trying the various versions available from different vendors. *
*NOTE- TUBES ARE NOT INCLUDED WITH THE TU-8900!



Automatic detection of 300B and 2A3 tubes
“300B” and “2A3” tubes look similar but their respective filament voltage and operating parameters are totally different. Their supply voltages need to be adjusted depending on which of these tubes are used in the same amp. In TU-8900, the tubes that are installed are detected automatically and the correct filament voltage and voltage of B-power are automatically set. When 300B tubes are installed- the LEDs on the sides of the volume knob will light up in blue. If 2A3 tubes are installed- the volume knob LEDs will light up in green. Additionally- these LEDs on the right and left side of the volume knob will turn red when there is excessive current due to defective tubes, etc., and the current is shut down to protect the amp. The red LEDs will also diagnose the problematic tube- the right side of the volume knob turns red when excess current occurs in the right channel, and vice versa.




■ Tube-friendly design
Warm-up time for directly-heated tubes and indirectly-heated tubes are different. In most designs, directly-heated tubes warm up faster than indirectly-heated tubes- so often directly heated tubes are often overloaded. With TU-8900, the voltage is gradually raised and reduces the level of overload to the directly-heated tubes.


12BH7A instead of 12AU7
TU-8900 is designed to use 12AU7 as voltage amplifying tubes. However, 12BH7A, with high driving ability, can also be used instead of 12AU7.


Ample space for larger coupling capacitors
Coupling capacitors can have a big effect on the sound quality. For the TU-8900, high quality conductive polymer electrolytic caps and polypropylene film caps are provided. However, exchanging for other coupling capacitors is also possible. The maximum size of the caps that can fit in the space is 22mm in diameter x 44mm in length.

Matching headphone impedance/volume levels
You can change the headphone impedance/volume levels by simply removing the front panel and change the position of a short pin.


Newly designed circuitry
The power transformer has independent windings for the right and left channel to minimize the interference between channels as much as possible. The filament power uses the latest DC-DC converter for extremely low noise and high efficiency. Schottky barrier diodes and fast recovery diodes are used as rectifying diodes that reduces even the most negligible noise spikes. Listeners can enjoy music free from noise even when using a pair of high efficiency headphones. The main circuit of the power unit is unitized per channel as a module.

Easily change the feedback setting to NON-NFB
Many triode tube amps use negative feedback in their design. The TU-8900 has an option for listeners to hear the triode tube sound without negative feedback. In TU-8900, changing the position of a short plug on the PCB can change the setting to NON-NFB. The gain level increases by approx. 8dB when NON-NFB setting.

Updated more reliable tube sockets
After brainstorming with our vendor, we have come up with a more reliable 4-pin sockets for 300B/2A3. Tubes are mounted safely and securely when installed in these sockets.


High heat-resistant polycarbonate tube cage
The IEC (International Electrotechnical Commission) sets guidelines on thermal limits on materials and parts, such as a chassis and the tube cage. The TU-8900 tube cage top can heat up to 100 degrees C due to the heat from the output tubes. A robust polycarbonate tube cage with high heat resistance is used to meet the IEC standard.

Specifications of TU-8900

●Stock tubes  : 300B (or 2A3) x 2pcs, 12AU7 (or 12BH7A) x 2pcs *Tubes not included
* specifications below are with the 300B+12AU7, with NFB, 8Ω loaded
●Rated output : 8W+8W (300B) / 3.5W+3.5W (2A3) <THD 10%>
●Rated input : 1Vrms (300B) / 650mVrms (2A3)
●Residual noise: 15μV (IHF-A)
●Frequency response: 7Hz-90kHz (with NFB) / 12Hz-45kHz (Without NFB)
●Input impedance : 50kΩ
●Output impedance : 4-6.3Ω, 8-16Ω (SW on backside)
●Input terminal : LINE x 1
●Output terminal : Speaker output terminals (L/R channel):Gold-plated screw type terminal (Banana plug usable)
Headphone terminal :6.3mm headphone jack
●Power voltage : AC110-120V or AC220-240V 50/60Hz (3P inlet)
●Power consumption: 95W (300B) / 65W (2A3)
●Measurement : W356xH214xD320mm (including projections)
●Weight : Approx. 11.4kg (excluding a power cable)
●JAN code : 4952682107941


Click the image to open in full size.

Last edited by vkung; 5th September 2021 at 12:52 AM.
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Old 10th July 2021, 12:47 AM   #2
Wansmith is offline Wansmith  Australia
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Join Date: Feb 2017
Wowow
New errekito. And a non NFB one! Interesting. Looking forward to your sonic evaluation and comparison with the current elekit and sun valley.
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Old 10th July 2021, 03:44 AM   #3
vkung is offline vkung  Canada
diyAudio Member
 
Join Date: May 2005
Location: Vancouver BC Canada
Sunvalley SV1616D is a traditional amp design... tube rectifier/choke/...
In fact Sunvalley keeps the same design for more than 20 years...
Mr Ohashi is a musican and audiophile. The amp design is based on sound..

ELEKIT tube amp is not a traditional tube amp design..
ELEKIT is changing the design model by model. The life span of each model is very short except TU-8200 and TU-8500.
Mr. Fujita is not an audiophile..His design is based on spec..
Both are good but they are using different approaches
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Old 12th July 2021, 10:16 PM   #4
Cifte12AU7 is offline Cifte12AU7  United States
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Join Date: Oct 2017
Location: Chicago, IL
This looks amazing. I'd love to see Mr. Fujita design 300B mono blocks or a tube DAC.
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Old 13th July 2021, 02:25 AM   #5
CohibaJoe is offline CohibaJoe  United States
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Join Date: Jun 2013
Location: Central NJ
Victor, Would you be able to list the Resistors the ELEKIT TU-8900 use? Since most Takman Carbon films are in stock now....Would like to order these before these run out.
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Old 13th July 2021, 02:56 AM   #6
vkung is offline vkung  Canada
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Join Date: May 2005
Location: Vancouver BC Canada
Takman confrimed no chemical to make 2% Carbon resistor.
I will not offer any resistor upgrade.
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Old 13th July 2021, 10:02 PM   #7
SonnyMarrow is offline SonnyMarrow  United States
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Join Date: Dec 2016
I am curious to know your opinion on stock vs Lundahl for this amp once you get to compare. I have the 8800 and the Lundahl transformers we a significant upgrade over stock.
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Old 13th July 2021, 10:42 PM   #8
vkung is offline vkung  Canada
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Join Date: May 2005
Location: Vancouver BC Canada
i will offer Lundahl Amphorous core OPT but I am waiting the demo amp to test the result..

Last edited by vkung; 14th July 2021 at 01:50 AM.
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Old 16th July 2021, 05:39 AM   #9
thejt is offline thejt
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Join Date: Jul 2021
Hey Viktor,
any view from yourself on how the 8900 sounds compared with the 8600 when running 300B? The 8900 is really interesting, would love to have an amp which can double duty as 300B and 2A3 but really love the pace and rhythm of the 8600 and wouldn't want to lose that. thanks.
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Old 16th July 2021, 08:56 AM   #10
vkung is offline vkung  Canada
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Join Date: May 2005
Location: Vancouver BC Canada
I should have the demo amp around the end of July..
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