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Little bear T7 tube valve Phono Turntable RIAA Preamp preamplifier amplifier ukNOTICE:Phono function Only for MM (Moving-MaganeticCartridge) turntable only.not support MC truntable,AUX function only for CD or DAC or PC or cellphone or similar player. Quick guide:
First: This is HiFi PHONO RIAA and CD multi-function preamplifier.phono RIAA function part is Iam re-design it refer DENON-AVR-2310CI AV amplifier, there is Very good music replay,sound restore to original.if you had a turntable already,now,it’s time to Revisit the classic,
AUX function is tube buffer function. tube mode is: 6J1, total 2 units use in T7, it’s will warm the sound. make better sound for voice tone. you can setup T7 work for AUX or phono by input selector. .
Secondly: this T7 powered by 12~18VAC, and this list included a transformer already (18Vac). with both voltage for choice. 115V or 230V,i will sent correct one to you by your order address. Outside shell is made by aluminum, good quality. T7 support MM turntable in phono function and CD player in AUX function.. so. make sure your turntable load MM cart .About the tube.. each tube for each channel. and the tube will light up when turn ON.because there is a LED under the tube. about the tube itself. inside the tube. also will light up. but just weak light. that’s normal.don’t worry about that.
In the end, all things you get is one assembled T7 preamplifier + one power supplly + 2 units 6J1 tube,(without user manual,connect cable or any other parts)Package included:1 x finished T7 preamplifier (as the picture.1 x power supply (110V or 230V),i will sent correct voltage version to you by your address.3 x 6J1 tubesParameters:RIAA phono part:RIAA freq response 20hz-20kHz +/- 0.5dB, S/N ratio >85dBTHD <0.05%, input sensitivity 3.0mV, gain 40dB,Nominal / max output 300mV / 1.8VOutput impedance 200 ohms, input 47k ohm / 220 pFAUX part:input voltage :AC12~18V
frequency response:20 HZ – 20 KHZ
input sensitivity 300 mv
SNR: 96 db
Total harmonic distortion <3% (1 KHZ)
Power range output: 0.2 W
Output impedance: 100KInput impedance: 50KTube model: 6J1(made in china, brand is :Beijing, you also can replace to other tube. similar:5654,6AK5,EF95 tube. you can direct replace it)Q&A about the hum problemQ: I got a loud hum with this T7 phono preamp. A: For the hum noise, in the beginning, we have to clarified that all phono preamps have a certain of background noise. It won’t be loud, while a little loud is just normal. Turntable is a kind of analog players and cannot be compared with digital players in this respect. Besides, there are many factors which may lead to bad noise. To find the right reason, you need to do some tests and here are some instructions. Reason A: T7 isn’t connected to ground well.This is the most common and unnoticed reason. Please test it following the steps as below.While the device is playing music, picking up the GND copper part of T7 with your fingers. If the background noise is much lower, then T7 isnt connected to the ground. For this issue, we prepared a 3m wire in the package for you to solve it by yourself. Just use it to connect the GND with any large mental item in your home like windows or mental tables. Reason B: T7 doesnt match with your amplifier well.There is a possibility that T7 may not match with some digital amplifiers well, which may lead to very loud noise.,(weve test it with few T and D Class digital amplifier. And found that. The T Class amplifier is best. Very quite back noise.. But. The D Class amplifier with loud noise. )Thats why we recommend using professional pure HiFi amplifiers like AV amplifier or vacuum tube amplifiers (it will be better if the amplifier isnt equipped with Bluetooth). Reason C: The RCA wire has a poor quality.A good RCA wire will be equipped with an anti-jamming magnetic ring, which can effectively reduce various interference.Q&A about the sound distortion problem:Reason A: your turntable output signal isnt PHONO. Maybe is LINE OUT. Please check the turntable output JACK. if there is a PHONO/LINE OUT switch. Please set it in PHONO mode.Reason B: T7s RIAA function part broken. Please contact us to get replacement main board. (or if youre DIYer. You also can repalcement it. Its 80% the OP chip burn. (the IC mode is: 2068, you can repalce it to 5532 or similar chip.About shipment time:If you are US buyer,we will ship item to you by USPS express.6-10 days arrval ,about GB,AU buyer.you can choice USPS model too.but ship fee is need add some money.see your Ebay order.or like other country buyer.this item will ship to you by normal mail,usually 2-4 weeks arrival
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Category: Sound and Vision:Home Audio and HiFi Separates:Record Players/Turntables
Location: ShenZhen