Brand new R8 stereo power amplifier tube KT88x4 or EL34*4 all-in-one & headphone amplifi | Электроника

Brand new R8 stereo power amplifier tube KT88x4 or EL34*4 all-in-one & headphone amplifi | Электроника

All items guaranteed 100% BRAND NEW in the original edition Box

Features:

• Pure hand-made, Point to point manual welding.

• Use a square power transformer specially developed for this machine.

• The output transformer uses two high quality wideband EI output transformers.

• The preamp stage uses one 6SN7 for power supply filtering.

• The voltage amplification stage and the push stage use two pairs of 6SL7 and 6SN7 tubes, respectively.

• The power amp stage uses four KT88/6550/EL34 tubes for class AB Push-pull power amplification.

• Triode and ultra-linear selection are available. The triode works in a soft, pure-and sleek sound, suitable for listening to vocals, strings and other types of music. Ultra-linear working mode, sound-tone open, unrestrained, good momentum, suitable for enjoying big scenes, big dynamics and other types of music.

• External independent BIAS-ADJ current display header. Adjustment and BIAS meter monitoring function keeps the best state of the power tube at all times.

• External EL34/KT88 tube selection function, easy to replace different types of tubes, adding endless fun.

• Infrared full-featured remote control.

• Use thick silver plated signal leads.

• With pure post-level function, it can be connected to independent preamplifier signal input.

• Power on mute delay function (about 30 seconds).

• Select Japanese ALPS high-end motor potentiometer.

• Easy-to-install plug-in tube cage cover.

Product parameters:

Frequency effect: 10Hz 40kHz (+/-0.5db)

Total harmonic distortion: 1% (1kHz)

Signal to noise ratio: 91dB

Input sensitivity: 380mv (when Integrated amp input), 820mv (when pure power amp input)

Input impedance: 100KΩ

Output impedance: 4Ω, 8Ω

Rated output power:

25W+25W (RMS triode working state) (KT88or EL34)

45W+45W (RMS ultra-linear working state) (KT88)

40W+40W (RMS ultra-linear working state) (EL34)

Preamp stage power supply filtering Tube: 6SN7*1

Voltage amplifier stage Tube: 6SL7*2

Driver stage Tube: 6SN7*2

Power vacuum tube: KT88*4 or EL34*4 (only 1 kind of power tube come, you need to choose)

Power supply voltage: 100V, 110V, 115V, 120V, 220V, 230V, 240V 50Hz/60Hz (there is a 230V/115V voltage change-over switch inside of body can work most country around the world)

Power consumption: 310W

Volume (W*H*D): 400*200*390 mm

Net weight: 26kg

Gross Weight: 30kg

Working conditions: Temperature: 0°~40°C, Humidity: 20%-80%

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.

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.

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.

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 speaker

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 :

（Due to COVID-19, other security measures are being taken around the world. Therefore, the number of domestic and foreign flights is reduced. Unfortunately, this leads to increased delivery time.

）

1. Orders above 2kg will be made by Fedex, DHL, TNT, UPS or other express.

2. Orders within 2kg will be shipped by EMS or China Post.

3. China Post Registered Small Bag "Rookie Reserve Price Adjustment Right" China Post Registered Air Mail is expected to have the following stats:

a.) Normal situation: arrive at the destination around 16-35 days

b.) Special circumstances: 35-60 days to reach the destination, special circumstances include: holidays, policy adjustments, remote areas, etc.

4. Usually We ship the package within 7 working days after the payment cleared.

The shipment usually takes 5-14 business days (most countreies to be bearrived usually takes 5-7 days).

5.

a.Due to COVID-19, About half of the customs ports toRussiawere closed, the customs need to strictly check every Truck, and customs clearance ports were closed in half;

b.Some areas were affected by heavy snow weather;

So, this leads to increased delivery time, Shipping to Russia takes longer time, it usually takes 30-45 business days.

6. Taxe & Duties: We are not responsible for any Taxe, Duties or Customs fees, These charges are the buyer's responsibility.

7. Faster payment, faster delivery.

(If you need other shipping methods, please contact us!)

About Return Policy:

1.If the item shows up defective or damaged, please email us immediately.

2. You have 10 days to contact us and 30 days to return it from the date it was received. If this item is in your possession more than10 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.

3.Returned packages displaying an invalid or expired will not be accepted.

4.Returned item should be in its original box with all packing materials and shipped to us via a traceable means.

5.We carefully inspect returned items upon receipt before issuance of refunds or exchanges.

6.Please allow up to 10 business days for us to process your return.

7.Shipping and handling charges, insurance are not refundable in any case.

8. The customer need to pay for shipping costs for exchanging or returning.

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. (Damaged, wrong product, sound is bad, no tracking information, package lost, apparence problem, shipping delay, etc) Any problem or dissatisfaction after received product, you must contact us in first before to give a negatif feedback or open a dispute. You can open dispute only when we can't give your a satisfied solution!

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 Shop customer service or email.