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vkung 1st November 2009 03:52 AM

Elekit TU-8300
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!
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 : Home page
E-mail :

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