Custom Grand HiFi Vacuum Tube AMP Kt88 Push-Pull Integrated Power Amplifier with Remote Control

Product Description

Specification:

This machine is sold with a protective cover

Custom Grand GX7 is an integrated amplifier.

This is also a power amplifier (with a group preamp input).

This is also a headphone amplifier.

This is also an amplifier for phono players, connect your phono player directly to this amplifier for output to speakers.

It comes with a remote control and a tube cage lid.

There are two versions to choose from, Standard and Upgrade

An upgraded version was recently launched. Internal coupling capacitors are specifically designed by designers to debug silver film capacitors. The upgraded version has expanded details, control and density.

 

feature:

1. Pure handmade, point-to-point manual welding

2, using two high-quality Japanese EI high-quality broadband EI output transformer

3. High-power Z11 iron core toroidal power transformer is specially designed for the machine

4. 5AR4 tube is used as rectifier power for voltage amplification and boost

5. Use 12AX7 and 12AU7 vacuum tubes for voltage amplification and inversion, and use KT88 vacuum tubes for AB1 push-pull power amplification;

Provide triode and super linear selection function: triode working mode, soft, pure, smooth, suitable for listening to vocals, string music and other types of music; super linear work, wide sound, unrestrained, good momentum, suitable for large scenes, large dynamic music.

6, peripheral power tube current adjustment knob and ammeter display.

7, with pure power amplifier function, can be connected to the preamp signal input.

8, with phono function, can be connected to a vinyl player (Phono player)

9, infrared remote control

10, mute delay function when booting (about 30 seconds)

11. Use Japanese ALPS motor potentiometer

12, easy to install plug-in vacuum tube cage cover

 

specification:

Rated output power: 25W + 25W (RMS triode)

45W + 45W (RMS super-linear)

Harmonic distortion: 1% (1kHz)

Frequency response: 15Hz ~ 30kHz (-1.5dB)

Input sensitivity: 280mV; 520mV (pre-input)

Input impedance: 100KΩ

Output impedance: 4Ω8Ω

Signal to noise ratio: 92dB

Left and right output balance: <0.5db

Power consumption: 260W

Vacuum tube: 12AX7 × 1, 12AU7 × 2, KT88 × 4, 5AR4 × 1

Dimensions (width x depth x height): 410 mm x 335 mm x 198 mm

Net weight: 25kg

 Power supply: 100V-240V 60Hz / 50Hz, 110V, 115V, 120V, 220V and 230V versions. The 100V and 240V versions take 5-10 business days to order.

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

Storage conditions: temperature: -20 ° C to 70 ° C humidity: 20% to 90%

 

Precautions:

1. Before opening, the tube amplifier must be connected to the speaker. When the switch is on, it is strictly prohibited to send a signal to the amplifier or the load is short-circuited without a load (speaker) connected.

 

2. Too high or too low power voltage will cause irreversible damage to the amplifier, preferably less than 5% of the specified voltage. If your power supply voltage exceeds this value, it is usually best to use it with AC power.

 

3. The temperature of the tube amplifier is high, please pay attention to ventilation and cooling.

 

4. In the casing or just closed for a period of time (within 30 minutes), do not spill liquid on the tube.

 

5. You should spend about 100h to operate the amplifier. RUN-IN can provide the best and stable sound. So within 100h before use, the sound may not be the best, you can also use your own run-in method.

 

6. If you are not sure how to intubate, please contact us before trying

 

Speaker connection

All tube amplifiers used in stereo mode: L (left) and R (right) speakers.

There are usually 6 speaker cable connectors: + 8L, + 4L, -0L, -0R, + 4R, + 8R

Example: + 8L and -0L are used to connect left 6-8ohm speakers

-0R, + 4R for connecting your Right 4ohms speakers

Amp Name	Custom Grand HIFI Vacuum Tube AMP KT88 Push-Pull Integrated Power Amplifier with Remote Control
Technical Parameters	Speakers output power: 25W + 25W (RMS triode mode) 45W + 45W (RMS ultra-linear mode) Headphone output power: 300ohm with 900mW , use 270  like a  basic divide to calculate the output power , for example  270 / 300ohm =0.9w for 300ohm headphone  ,   270 / 32ohm = 8.5w for 32ohm headphone  Input impedance: 100KΩ  Output Impedance: 4Ω - 8Ω(6) SNR: 92dB  output balance of the left and right: <0.5db Input Sensitivity: 280mV;  520mV (pre input) Harmonic distortion: 1% (1kHz) Frequency Machine: 15Hz ~ 30kHz (-1.5dB) Anode voltage: about 420v Net weight: 22.5kg  Package weight: 25kg  power consumption: 260W
Components	Pot/Bias Japan, Sweden brand, etc
Features	Handmade, using scaffolding welding  using two high quality and wide frequency response EI output transformer Using a customize Z11 core toroidal power transformer Amplification and drive part use SAR4 rectifier . Use 2X12AX7 and 2X12AU7 as amplifiaction, Use special high selected KT88 tube as push pull power amp lamp,providing switch for the triode connnection and ultra-linear connection modes.The triode connection mode is more suitable for the voice and the sound is more soft, delicat as well as nature. The ultra-linear connection is suitable for the big scence, the sound is more open and lively.  It has a pure power amplifier ans it can conncet with an independent pre-amp's signal input.  It has a phono stage input function, which can be connect directly with a MM Vinyl turntables There is a power tube current control button and an electric meter dial. Infrared remote control function  Power Mute delay function Selection of Japanese high-grade ALPS motor potentiometer. Easy installation of the plug-type vacuum tube shield
Tube replace table	Preamp tube:  12AX7 × 1(Equivalant ECC83,CV4004  ECC803,5751)                    Preamp tube: 12AU7 × 2(Equivalant ECC82,5814,6189 CV4003)       Power tube: KT88 × 4 (Equivalant 6550) Rectifier: 5AR4 × 1 (Equivalant GZ34)
Customized	OEM, ODM, OBM
Tube Brand	Ruby, Shuguang, JJ, EH
Brand	Grand or custom as per logo plates

Introduction:
Our company has 230 workers, include 15 professional engineers. They supervise the whole producing line from choose material till packing. We can strictly arrange the products as your requests.
Grand Technology is a manufacturer of musical instruments and accessories, which brand is "Grand".
Our factory is located in one of the most important ports of South China, Shekou, Guangdong, Near HK, connects with main highways and airports.
As the professional manufacturer, we supply kinds of musical products such tube guitar amplifiers, hand wired tube guitar amps, point to point amps, replica pedals and amps, electric guitars, acoustic guitars, ukulele, banjo, piano, etc many kinds of musical Instrument gears.
We only provide good quality products with low prices, which are selling well in the international markets, such as USA, Europe, Japan, Korea, South Africa, Kenya, South America, etc. We have plenty experiences in exporting, and be good at holding the mainstream of musical instrument markets.
At present, we establish technology, purchasing, and sales groups to serve our customers. We are thinking in your way, doing as your requests and eager to be your reliable supplier.
Any inquiry will be welcome and highly appreciated.

Custom amplifier project?
We are specialized in OEM/customize guitar, AMP, pedal, etc order, if you need a customize guitar amplifier, please feel free to talk with us.
Please feel free to ask me project example for reference.
Please beware the customize guitar AMP can take as long as 45-90 days depends on AMP schemaitc complex term.
Our Services:
1. OEM/ODM factory direct.
2. Professional engineers who have the ability to create what customers need.
3. High quality guarantee with competitive price.
4. Have a full set of testing equipment for products' functions to ensure reliable quality.
5. Fast feedback within 2 hours.
6. Shipping on-time.
7. Aftersale service, if any reason in our side, we can free exchange for you.
8. All of our product have attained CE, RoHS and related certificates approval.
FAQ:
Q1:What is your Warranty for the products?
A1:We provide 1 Years' Warranty and 7 days Return Services.
More details pls contact our Sales.

Q2:May I buy samples from you?
A2:Yes! You are welcome to place sample order to test our superior quality and service.

Q3: What's the leading time? (How long do you need to prepare my goods?)
A3:10 working days for sample orders.
30 working days for bulk order (based on different quantities).

Q4: How will you deliver my goods to me? How long do I need to wait before my goods arrive?
A4:We offer many shipping ways like DHL, UPS, FedEx, TNT ,EMS to enable our customers get their goods rapidly at door. We also ship by economic method such as air cargo and sea cargo, Direct line, Air Mail according to clients' request.
3-7 days for international express, 5-7 days for air cargo, 20-40 days via sea cargo.

Q5: How is your product quality?
A5:We provide unrivaled Quality - Very rigorous testing process for Incoming Quality Control, Input Process Quality Control, and Final Quality Control for every piece. We follow 20 QC test procedure, and do 100% FQC to ensure your satisfaction.

Q6: Can you put my brand name (logo) on the products?
A6:Yes! We can provide professional OEM services to make it your brand even for your trial sample order.

A7: If your order is over 20pcs, we can make your own logo badge brand on the amp for free! About other more details, it's according to your special requirement.

Q8: What payment method do you accept?
A5: T/T(Bank transfer), Western Union, Paypal, Escrow, etc.

Q9: Do you have any After-Sales service?
A9:Yes! We have professional After-sales service
If you have any technical problem or questions with the goods, welcome to contact our Technical Support Dept. or our sales directly.

Q10: Are you just trading company or factory?
A10: We are professional manufacturer for musical instruments products. We can supply the unrivaled Quality and Services with competitive factory price.

Choose Amp, Choose Grand!!!