Nobsound Music Hall EAR834 MM Magnet / MC Moving Coil RIAA JJ 12AX7 Tube Phono Stage

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Model Number
Brand Name
Maximum Power Per Channel
2 (2.0)
Power amplifer

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Douk Audio MM/MC Vacuum Tube Phono Pre-Amplifier
This circuit More than 200 times amplification, so  have a high demands on components, we must tested and selected in lots of times to ensure these components matched well. Our Douk Audio Studio have 3 years of experience in the production of this Kit, more than 2000 sets of sales at home and abroad, this is the latest May 1, 2017 Version, High-quality promised, special desgin for the Hi-end DIY Audiophile.

Inspired by famous machine
Feedback type MM (Moving Magnet) / MC (Moving Coil) Phono Preamplifier
Built-in rechargeable battery powered electronic boost transformer
Under testing in  ups precision power supply
Input Voltage:   115V / 235V 
Default Tube: 3× JJ ECC83S (or 12AX7)

Main parameters: (use BEL ECC83 tube for test)
  • Tube: 3× JJ ECC83S (Replace tube: ECC83, ECC803,12AX7,5751,6N4 etc.)
  • Input sensitivity: (MM / 2mv / 47Kohm) (MC / 0.2MV / 100ohm)
  • Input signal sampling 1khz. 
  • Magnification 47db/about 240 times, 65db/about 2000 times
  • Output Squelch residue <0.4mv 
  • SNR about 78db 
  • Weight 4.5kg
  • Size: (W)140 × (H)110 × (L)318 mm

Remarks: When the MM/MC switch on MC grade place is for MC (Moving Coil) amplification, on MM grade place is for MM (Moving Magnet) amplification and simultaneously charging the battery. Configuration 280ma battery, the theoretical value of a full charge can be used more than 30 hours. The first charge need long full charging, it is recommended to use every 5 hours after charging to keep the battery in the best power state! 

Package included:
  • 1×  Phono Preamp
  • 3× JJ ECC83S Tube

Package not include power cord, you need to prepare it by yourself!


Pleases Special Note:
This Product is sepcial desgined for experienced players, need you have Professional knowledge, the Unsuccessful Diy Making is Beyong The Scope Of Our Warranty, We Only Support The Technical Consulting Support.

Because everytime purchase of components may different, the real object and photos may be slightly different, but the quality and performance is the same. 
This is pure DIY product, Sometimes may have inevitably flawed

We provide MM and MM + MC version for your choice

Below it's our client comments about this phono preamplifier:

I received your package last monday.
I´m very surprised and pleased it arrived so fast. Thanks! Especially grateful for the handling regarding tax etc. It came directly.
No wasted time waiting perhaps 14 days for customs to declare the goods. That was the good part.
All new valve equipment sounds awful for the first couple hours whereafter the sound normally improves considerably.
This was true here as well - to some point. But my frustration rose as the channel balance of the thing shifted to mostly play in the left channel.
One immediately starts to fear the worst. Is it due to imbalance in the circuit/ components, perhaps the volume pot mistracking - or perhaps the tubes?
I believe its the tubes - especially the one in V2. This JJ tube must have two very imbalanced halves/ envelopes.
It rather surprises me as JJ´s aren´t normally the worst brand to choose.
Luckily I have a large collection of prima 12AX7/ ECC83: NOS Telefunken, Siemens, Mullard, RCA´s etc. so now my riaa plays and sounds really wonderful.
I´m quite surprised at the high sound quality. Its unbelievably good - even in absolute terms - not taking price into the equation.
I own a Audio Note/ Kondo M7 FET riaa-pre to compare it to. Your riaa is in no way embarrassed by this comparison. - So glad I found it!
Congrats on a "killer" riaa-pre. You ought to sell these by the truckloads. Nothing remotely price wise comes near.

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About Us :

We are dedicated to offer the best audio-visual products at the lowest price to our customers. Bringing great products and customer service, and thus help enriching our customers’ lives is our ultimate goal. 

About shipping :

1. WORLDWIDE SHIPPING. (Except some countries and APO/FPO)
2. Orders processed timely after the payment verification.
3. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address.
4. We need a processing time for preparing the order to deploy products and process the china local shipping. After the International warehouse delivery, we shall provide u the tracking number in 5~10 days for the international shipping.
5. Import duties:Taxes and charges are not included in the item price or shipping charges.These charges are the buyer's responsibility. Often we declare value further less than real price, if you need, please contact us by message or email to discuss about the Customs declaration.

6. For Russia CU TRANS ship way, the tariff is include

7. You should check the product's appearance (and tubes) safety before to sign receipt. else we can't seek compensation with the couriers.

8. If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!


1. You have 7 days to contact us and 30 days to return it from the date it was received. If this item is in your possession more than 7 days, it is considered used and WE WILL NOT ISSUE YOU A REFUND OR REPLACEMENT. There are NO EXCEPTIONS! Shipping cost is bear by buyer.
2. All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your po#.

About Guarantee:

1. 12 months Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.
2. Defective items MUST BE reported and returned within the warranty period (and in the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN EXPIRED WARRANTY.
You agree to all of the above-listed policies upon ordering on aliexpress!

About feedback:

1.Since online shopping uncertainty, so thank u very much for choosing&trusting us.our service is ready to help u any time,your feedback is extremely important to us.
2.If you are satisfied, please leave 5 stars positive feedbacks, It’s very honored for us to achieve generous authentic assessments and photographs,thx!
3.Any product or shipping issue, please contact us before opening the dispute or leaving any nertral/negative feedback, we'll carefull to do our endeavor to solve problems to the most make you satisfied.
4.In case of returns, please contact us first, you describe the problems and reasons.Then we'll send you the return slip.For all other questions contact us by site message or email


Shipping CompanyShipping CostEstimated Delivery Time
DHL3 - 7 days
UPS Expedited3 - 7 days
EMS5 - 14 days
Post Air MailFree Shipping15 - 45 days
Return PolicyIf the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller ServiceOn-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).