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You may also like 20x Soft Golf Shoe Spikes Replacement Cleat Fast Twist Q-Lok For Footjoy Champ 12.99 USD For Insta360 X3 Camera Accessories Aluminum Alloy Protective Cage Housing Frame 58.99 USD 2Pcs Replacement Full Range Speaker for JBL Charge 3 4ohm 10W Bluetooth Speaker 17.99 USD Lot of 50Pack Rubber 1/32 RC Car Model Tires Diorama Display DIY New Black Tire 10.99 USD 3.99 USD Electric Start Drill Bit Engine Starter Adapter for String Trimmer Leaf Blower g 9.99 USD 36X Phone Camera Telephoto Lens Zoom Fisheye Wide Angle Lens For iPhone 25.99 USD SAFE & SECURE SHOPPING 100% SATISFACTION GUARANTEED FAST SHIPPING Upgraded 6K4 Tube Preamplifier HiFi Tube Preamp Auido Amp Home Theater DIY Product Description Features: 1. High-quality materials, experience enhanced audio fidelity, restore true sound 2. Stable product performance, upgraded for a variety of models of bile ducts 3. Preamplifier frequency response 5HZ-500KHZ, as long as your ears can hear the frequency through the preamplifier is also the same as can be heard 4. The preamplifier has a toggle switch with three adjustable stages, which you can freely adjust according to your own preferences and audio settings. 5. Wide range of applications, support any low-level signal input. Parameters: Power supply: DC12-16V Current: ≥1A 1. This line uses the DC boost line power supply DC12V can be boosted to more than 120V power supply; single DC12V1A (DC12V1A), the current is not limited, the voltage does not exceed 16V preamplification; voltage amplification 5 times, amplification is a little big, hear the distortion can be reduced in moderation volume 2 preamp working condition: full-frequency output, full-frequency output does not exist there is a lack of any frequency, if you hear the high and low frequency which is less, please check your equipment preamp sensitivity: up to the effective 3V is not distorted! 3. Tube preamplifier is a class A amplification state (that is, the preamplifier is always amplified state), the signal line is recommended to use the line with shielding, otherwise it may produce interference with the sound and so on! Instructions for use: 1. Locator with switch: twist the knob clockwise to "tick" a light, which is the smallest volume, continue to clockwise twist to increase the volume! 2. Tube filament: tube to be inserted into the end, boot to see the tube filament light red, note that the backlight is also red, to tube filament light machine only operation 3. audio output input: close to the power connector side is the output, the output should be connected to the amplifier or active speakers, the input to the audio source: such as mobile phones, CDs, computers, TVs, MP3 and other low-level signal input 4. DC input, using DC3.5/5.5*2.1 socket 5. Left and right channel inputs are audio signal inputs, which can be connected to low-level signal inputs. 6. The left and right channel outputs are audio signal outputs, which can be connected to the audio signal inputs of amplifiers or active speakers. 7. Before this stage with amplification function, if your audio source itself with noise, it will amplify the noise that comes with the audio source, so please use a good audio source to test. 8. The product we have been rigorously tested to ensure that there is no problem before the issue of the machine does not come with the noise, if you encounter the above problem can be excluded from the test method Package include: 1* Preamplifier About Us Payment Shipping Returns Contact Us About Us Welcome to our store! Our aim is to offer our clients items with high quality and fast delivery, also our price will be reasonable. We supply many products including video game, health & beauty, phone accessories, computers accessories, camera & camcorder,car accessories, games, toys & hobbies, jewelry, antique & craftwork. Excellent customer service and a reliable credit standing is our tenet. Payment We accept all verified payments from ebay. Orders will be shipped after receiving cleared payment. Payment due within 7 days after auction ends and for buy it now listings. Shipping We ship most of our orders within 24 hours, and may up to 48 hours. If you want faster shipping way. Please contact us before making payment. Sometimes due to problems with our transportation company system, your shipping information may be delayed to update. We recommend that you try again after 3-4 days. If you still haven't checked the shipping information, you can contact us by ebay message. Returns Always believe we can figure things out with communication, if it comes to return, the pacakge must be intact and the same as you receive. 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. Return/refund is accepted within 30 days after the buyer receives the item. NO exchange will be accepted after 30 days from the date when the item is received. Please contact us first before returning your product!!! Contact Us If you have any questions, our Customer Service staffs welcome you to email us. We strive to answer all questions and resolve any problems as quickly as possible. You can contact us 7*24, we will reply at the first time, and we will surely solve your problems. Note: 1.We try our best to reply to your emails as soon as possible, however, due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. Please allow 1 business days for us to response. If you do not receive any reply from us, please check your email ensuring your mailbox has not reached full size. 2.Due to some ISP SPAM filter settings, you may not be able to receive our replies; if you have problems receiving our emails, you may need to use a different email account to contact us. 3.Please give us the opportunity to resolve any problem. We understand the concerns and frustrations you might have, and will try our best to resolve the issues. Please email us before leaving any negative feedback or open any dispute on PayPal. 4.We care about our valued customers, and will always try to help you. So if you have any problems, please e-mail us immediately. 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