Technical Parameter
Input impedance:100 Kohm
Output impedance:600 ohm
Total Hamonic Distortion:less than 0.01%
Frequency Responses:20Hz-30KHz+-1dB
Signal to Noise Ratio :90dB
Input Jack:4 groups
Output Jack:2 groups
Supply Votage:AC220V 60Hz/50Hz.
Size:435mm(width)*90mm(height)*290mm(Depth)
Used tubes :12AT7*2PCS,12AU7*2PCS,6Z4*2PCS
Working enviroment:Temperature:5-40 dgrees
                   Humidity:35%-80%
Net weight:about 5.6kg

 

Thank you for listening to our 728A tube preamplifier.The function and appearance of this unit now are perfect after going through improvements for several times.
The pre-amplifier improved based on famous Wada ,Shigeho's Style Electric ,which was introduced by Wada Shigeho in the early 1960s and gave an excellent performance.
Using the entire circuit board design,internal layout is more rational and refined.
Brushed aluminum(8mm thickness)siliver faceplate,with all metal buttons and knobs,plus blue LED indicator light and unique tubes display window.
(2)groups of RCA outputs:one with low impendance output and one with high impedance out put.The unit not only can be connected to power as a preamplifier ,but aslo can be connected to integrated amplifier as a timbre regulator and improve the sound quality of whole system.
R-shape high efficiency transformer and gold coated RCA connectors plus outputs terminals.
Adopts 4pcs of paper in oil capacitors and German WIMA capacitors for coupling effect,make the sound warm and more details.

All resistors and capacitorsare audiophile grade to ensure sound quality.
The unit have Bass and Treble Controls and volume,balance adjustment on it plus tone bypass function,it bypasses the treble and bass controls ,so you get a more "neutral"and original sound.

 

Payment
1. We Do Accept Paypal only.
2. please leave a message if you use other addresses rather than the default PayPal address
3. The buyer will be responsible for the Customs dutiest. If it is needed in your country custom.
4.I additionally offer discounts of up to 20%, please contact me.
1. We Ship to Worldwide.
2. We ship your orders within 1-10 business days after the payment cleared.
3. Item shipped from China via china Post Airmail, reach most of the countries within 2 to 4 weeks. sometimes take longer in some remote city.
4. Delivery time depends on destination and other factors, it may takes up to 20-50days. If you don't receive the item after 25 days,please contact us, we'll investigate and solve the delivery problem.
5. Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.

1.We accept return or replace goods within 30 days after package signed.
2.Return police
1)Quality problem or get wrong item:you can get free change or full refund
2)Dislike:You can return goods back to us,and get your payment back
3.Return Shipping Fee:
1)Quality problem or get wrong item:Shipping free on seller
2)Dislike:Shipping fee on buyer
If you have any questions, please feel free to email our service specialists 24 Hours a Day, 7 Days a Week.
We will reply you ASAP. If no response within 24 Hours, please check the spam in your mail box.
We greatly appreciate your POSITIVE feedback. Please do NOT leave negative feedback without asking for help.
Our aim is to provide Top Level Customer Service, so we will try our best to solve any problem.
Please DON’T leave negative or neutral feedback if you haven’t received item in 30 days, because we have mentioned the shipping time repeatedly.

1. working time:
Monday-Saturday(Beijing Time 8:30A.M-6:00P.M )

2. Please contact us by Ebay message(not e-mail). we will reply to you within 24 hours. as soon as possible.

3. Please contact us before you would like to give a dispute or negative feedback.
4. please kindly re-sent your email If you do not receive our reply.