Option 1:
Stainless Steel Chassis Without Meter
DIY amplifier chassis, material: brushed stainless steel chassis.
The rectifier tube uses Shuguang 5Z3P (the metal base or plastic base is randomly determined according to the electron tube) or the new Shuguang 5U4G. The price is the same. Which one to install depends on the inventory.
Machine performance parameters are as follows:
Output transformer: 66x45mm 10w parameters: 3.5k: 0:4:8 ohm
Power transformer:96X50mm 165w
Input voltage: 230v (other 115v 220v 240v voltage transformers can be customized separately)
Output power: 8w + 8w
Output impedance: 4Ω 8Ω
Input impedance: 100k
Frequency response: 20hz---20khz
Input sensitivity: 400mv-2000mv
Signal-to-noise ratio: 90db
Harmonic distortion: 2%
Overall machine size: 330mm wide x 260mm deep x 210mm high
Amplifier configuration:
Rectifier tube: 5Z3P X1 or use the new Sugon 5U4G, which one is used depends on the purchase batch. (Other replacements include 5Z3PA 5U3C 274B, etc.)
Preamp tube: 6H9C Soviet Union (other substitutions include 6N9P 6SL7 5691, etc.)
Power stage tube: FD422 (other substitutions are 2E22)
Option 2:
Iron spray plastic electrical gray Chassis
(with ear amplifier base, can listen headphones and push speaker.)
Many tube amps do not come with headphone amps because it is difficult to control the noise floor of tube amps. After many experiments, our store tries to control the noise floor to a very small level (there is also noise floor, but it is controlled within the acceptable range of human ears).
The rectifier tube uses Shuguang 5Z3P (the metal base or plastic base is randomly determined according to the electron tube) or the new Shuguang 5U4G. The price is the same. Which one to install depends on the inventory.
Parameters of amplifier: Dual-purpose model with headphone amp stand (can push speakers and listen to headphones)
With speaker and amp switch. Turn the small switch on the front of the chassis upward, and the 8-ohm speakers will sound (the default is to switch between 8 ohms and headphones), but the headphones will not sound. When the small switch is turned down, the 8-ohm speakers will stop sounding and the headphones will sound. If the speaker is plugged into 4 ohms, the small switch will sound upward to the speaker. Down - both speakers and headphones sound. Cannot switch.
Purely handmade scaffolding machine, internal inductor, new brand power filter capacitor, high-end Taiwan stepper double 100K potentiometer (with balance adjustment hole), American brand coupling. Gold-plated RC terminal, pure copper crystal terminal, 0-4-8 ohm. Three-pin socket with insurance. The machine has a bottom plate and uses high-grade silver feet.
Machine performance parameters are as follows:
Output transformer: 66x45mm 10W Parameters: 3.5k: 0: 4: 8 ohm
Power transformer:96X50mm 165W
Inductor transformer: 4H
Input voltage: 230v (other voltages 100V 115V 220V 240V can be customized separately)
Output power: 8w + 8w
Output impedance: 4Ω 8Ω
Input impedance: 100k
Frequency response: 20hz---20khz
Input sensitivity: 400mv-2000mv
Signal-to-noise ratio: 90db
Harmonic distortion: 2%
Overall machine size: 330mm wide x 260mm deep x 210mm high
Amplifier configuration:
Rectifier tube: 5Z3P or use the new Sugon 5U4G, which one is used depends on the purchase batch. (Other replacements include 5Z3PA 5U3C 274B, etc.)
Preamp tube: 6H9C Soviet Union (other substitutions include 6N9P 6SL7 5691, etc.)
Power stage tube: FD422 (other substitutions are 2E22)
Headphone parameters are as follows:
Impedance 32 ohms-300 ohms
Sensitivity above 89db - around 105db
Either a small 3.5-inch head or a large 6.5-inch head is fine. The default is two-channel.
If you plug in the 6.5mm plug, you need to pull out the adapter.
Special reminder is as follows: When pulling out the converter head, you must press the red button on the amp stand and press it all the way to pull it out. If you pull it out without pressing the button, it will easily damage the internal shrapnel of the amp holder, resulting in monophonic or poor contact.
Option 3:
New stainless steel with meter
The shipment comes with 5 tubes: 1 Shuguang 5Z3P or 5U4G rectifier tube (according to the purchase batch), 2 Soviet 6H9C preamp tubes, and 2 Shuguang FD422 post-stage tubes.
The rectifier tube uses Shuguang 5Z3P (the metal base or plastic base is randomly determined according to the electron tube) or the new Shuguang 5U4G. The price is the same. Which one to install depends on the inventory.
Machine features:
Although the power of the direct heating tube FD422 is only 8W, due to the strong load capacity of the tube amplifier, it can drive a pair of medium-sized speakers. The vocal characteristics are delicate and true, and the tone is warm and sweet, which fully utilizes the advantages of the direct heating tube. The details of the strings are meticulous and the dynamics are full of charm.
Speaker parameters:
The impedance of the speaker parameters you choose can be 4, 5, 6 or 8 ohms, the wattage is from 30 to 80w, and the sensitivity should be above 89db. (If the sensitivity of the speaker is 90db, you can choose 60 to 100W.) The caliber is from 3 to 8 inches, full range or 2-way. Suitable. It is not suitable for floor-standing 3-way frequency, and the amplifier amplifier has no effect.
Precautions for using the amplifier:
1: The tube amplifier can only be (push) connected to passive speakers, and a pair (2) speakers are required. It cannot be connected to a subwoofer or powered speakers (that is, speakers with their own amplifiers, speakers with volume knobs cannot be connected).
2: The amplifier must be connected to the speakers before it can be turned on for testing. The downstream stage of the tube amp cannot be unloaded. If it is not connected to a speaker, it will be unloaded, causing the primary voltage of the output transformer to rise and burning the output transformer or tube.
3: The electrical socket or strip used by the tube amplifier cannot be shared with the computer or electric fan. This will cause electromagnetic interference and cause the machine to communicate with the noise floor. It is best to use a separate socket.
The amplifier has been grounded internally, uses a standard 3-hole fuse, and has an internal spare fuse.
