Elekit TU-8300R DX Version
300B SINGLE STEREO POWER AMPLIFIER "TU-LAB
TU-8300 stereo power amplifier with 300B tubes, the most popular tube, is designed with many flexibilities. Tube lovers can use his favourite combination of tubes, output transformers (OPT), volumes, etc and enjoy this experimental TU-LAB! [/B]
TU-8300R DX version 300B/6L6GC
The DX version includes
1. 6 Amntrans AMCO 0.047uf film coupling capacitor
2. 59 pieces Amtrans AMRS carbon film resistor (1/2W)
V-Cap CuTF version add $360.00
V-Cap TFTF version add $260.00
Assembly example (with 300B tubes)
Included parts for assembly
Assembly example (wit KT-88 tubes)
●Triode connection of pentode also available!Triode-connected pentode and beam tube have equal qualification and attraction as300B. In this TU-LAB, 8 pin sockets are equipped, which enables triode connection of such tubes as KT88(6550), KT66, EL34(6CA7), 6L6GC, etc, without any modifications to the amplifier.
●Try different OPT and volumes!
A slide universal bracket, or in other words “magical bracket” (which enables various kinds of OPTs in various shapes to be installed) is developed for TU-LAB so that most of commercially-available OPTs for 300B single amplifier can be used.
●Full of ingenuity for high quality sound, stability, safety, and energy-saving
[“Constant current circuit, self-bias + fixed bias” method]
Constant current circuit is adopted instead of cathode resistors of self-bias method so that a constant plate current flows no matter what tubes in our assumption are used. (rated currency value can be fine-adjusted).
[Power shut-down circuit for OPT upon over-current]
If over-current occurs in either of the OPTs even for one second, the B power supply is shut down and LED indicator at the troubled side shows that there took place a malfunction.
[FET ripple filer]
FET ripple filter, time-proven in the performance of the reduction of hum noise is adopted for the B power supply.
[All tubes heated by AC]
From a conservation point of view, all tubes are heated by AC power so that the power loss in the rectifying circuit is improved and heating is moderated.
●World-wide power transformer
A multi power transformer can be used under 4 different power voltage environments, such as 100V, 115V, 200V, and 230V (Select the setting location of the corresponding connector upon assembly.)
●Tubes：300Bx2, 12AT7x2 (No tubes for replacement included)
●Max. output: 8W+8W (by default, with 300B tubes and 8Ω of load applied)
●Frequency response(-3dB): 15Hz~40kHz
●Residual noise (IEC filtering): 0.5mV (0.1,V when KT88 installed)
●Input sensitivity: 200mV ●DF：6.3 ●Speaker: 4~16Ω
●Output terminal : Gold-plated, binding post
(bare wires up to Φ5mm can be inserted, and banana plugs can also be
●Input terminal : Gold-plated RCA jack, single stereo line (at the back)
●Power input : 3P inlet (IEC320)
●Power voltage : 100V AC 50/60Hz
(115V, 200V, and 230V are also available. Change the soldering location
of the connector for power transformer as shown in the photo below.)
●Power consumption: 80W by standard (70W~95W as ip is fine-adjustable.)
●Dimension: W400xH213xD250 mm
(Chassis with the punched metal cover, protrusion not included.)
●Weight: 10.8kg (fully assembled, without a power cable)
●ip adjustment range: Approx. 50~80mA (L,R independently adjusted)
●Ham balancer function equipped
●A microcomputer is adopted for TU-LAB, for the first time to our TU series
amplifier (warming-up timer <delay in B power supply>, cathode voltage
monitoring, automatic shut down of B power supply upon malfunction)
【Tools required for assembly】
Soldering iron (15~30W), Solder, Soldering iron stand,
Philips screwdriver (＃2), Diagonal cutter, Long-nose pliers, Allen wrench (1.5mm), Penknife, Scissors
For inquiries :vk-music
Webesite : VKMusic.ca Home page
E-mail : email@example.com
I just built this amp ,great sounding amp.
Have you tried any NFB it shows on the circuit board that you can hook it up.
I don,t have any test equipment for this.
TU-8300 with Tango XE-20S - vkung - VK Music - Elekit & Triode Japan Forum
I won't touch the NFB.. It will cause oscillation.
I sold this amp 5 year ago. From my experience, the most obvious change in sound is the carbon resistors, the coupling caps and the OPT. I offer the AMRS carbon resistors and Amtrans AMCO coupling cap for free with TU-8300R. Any question ,, you can let me know..
Greetings, looking to purchase a TU-8300R. Can you help me out?
There is a new amp available in August/September.
yes if you bought the amp .. the resistors and amco are free of charge at the time..
yes, I bought the 8300 many years ago
TU-8300R capacitor upgrade
Would like to know what is the capacitors upgrade that I can do to my 8300 ?
Is it worth to do it ? I mean like "Mundorf" "Jensen" or AMCO is good enough ?
yes...it is 0.047
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