Input voltage:costomize for 100-120v  or 220-240V 50-60hz,  we automatically send you the best matched voltage version, we are familiar about the different voltage request,
Features:
Tube cover is included
The first oldchen ower desgin high performence tube preamplifier, Â have a real high selling record in China,
The boost function allows you to adjust the tone according to your preference. It improves the strength of the high frequency and low frequency resolution as well as the overall dynamic range.
External large margin el pure copper transformer, 10HÂ inductance, clc filter, bile rectifier linear voltage regulator, two-stage direct-coupled cathode output circuit, all ruby electrolysis, rel fever coupling, Weimar tone, high precision metal film resistor , 5 pure copper gold-plated stainless steel ceramic sockets, Omron relay is responsible for 4-way input and high and low bass intervention switching, reasonable matching components and layout make the appearance and performance of the whole machine reach the ideal state.
Manufactuer "LaoChen" have 3 brands name: "Oldchen" , "LaoChen", "Aiqin"， So for this product, we have some amplifier maybe come with "Oldchen" words on the front plate , and others come with "LaoChen" , please pay attention,
Tube Amplifier Precautions
1. Tube amp must connected with speakers before turning ON. Strictly prohibit send signals to amp without connected loads(speakers) or load short circuit when the switch is ON.(Hifi exquis 1101017)
2. Too high or too low power supply voltage does irreversible harm to the amp,preferably less than 5% of the specified voltage. If your mains voltage exceeds this value, often best to use with the AC power supply.
3. Temperature is higher when tube amps working, placing attention to ventilation, cooling. (Hifi exquis 1101017)
4. In the boot or just shut down for a period of time (within 30 minutes) Do not spill liquid on the tubes.
5. You should take about 100h time to operate the amp.RUN-IN to the amp gives it's best and stable sound.so during the first 100h use time the sound maybe is not the best,you can also use your own run-in method.Â
6. If you donot sure how to plug the tubes, please contact us before try it
Speakers connection
All tube amplifier used with stereo mode:  L(left) and R(right) speakers. Normally there are 6 speaker cable connectors: +8L, +4L, -0L, -0R, +4R, +8R Example: +8L and -0L are for connecting with your Left 6-8ohms speaker -0R, +4R is for connecting with your Right 4ohms speakerÂ
HP70 Black 
HP70 Silver 
AVplay A-75 X2 
Queenway PRE-501TU 
Reviews
There are no reviews yet.