Description

DIY Vacuum Tube Preamp Build Kit with PCB, Vacuum Tubes, and small parts (requires a 12VAC Transformer). The power transformer can be purchased below. Choose 110V for USA and 220V for European (12V 10W option). We also offer a complete small vacuum tube power amp kit to complete your set up:)

AC 110V / 50Hz EI48*24 power transformer 10W 110V to 12V 1A AC 12V (single output) 110V input 10VA

https://crunchytubeamps.com/product/1w-2w-3w-5w-10w-20w-30w-transformer-power-input-ac-220v-50hz-output-ac-6v-9v-12v-15v-18v-24v-single-double/

Specification:

Item name: Biliary Electronic Tube DIY Kit

Board size: 75*77mm

Shell size: 97*90*35mm

Working voltage: single AC 12V, power supply, current requirement 800MA, AC 12V through rectifier filter

Wave voltage doubling circuit, output positive and negative 28V dual power supply to power the electronic tube.

Signal processing part: the signal is buffered and amplified by electronic tube 6J1 (62), and used by power amplifier or ear amplifier.

The signal is a voltage signal and cannot directly drive the horn or headset.

Product description:

This circuit is designed based on the circuit principle of the music fax X-10D, which has been reasonably optimized and has more stable performance than the original machine. The electronic tube performance has been improved by 10% The main function is to improve and enhance the sound quality, remove the harsh digital from the sound source, and make the music sound warm. The bile machine has its unique “bile flavor”, which can make the sound warm with a dynamic range, and good linearity. The the tone of the amplifier gives music a strong flavor. It is a very worthwhile circuit for enthusiasts to play with.

Production precautions

1. The power input of this product is a single AC 12V, and the voltage can be changed by oneself. However, the withstand voltage value of the capacitor also needs to be changed, and DC power supplies with DC cannot be used;

2. Do not weld for too long, 1-3 seconds, otherwise the copper sheet will fall off. If it is not welded properly at once, remove the soldering iron and weld again. Be sure to take good care of the production pictures and text, distinguish the positive and negative poles, and pay attention to the white silk screen welding of the corresponding components during welding. After welding, cut all the extra pins to avoid malfunctions.

3. Both input and output interfaces are lotus shaped, and if you want to connect to a 3.5mm headphone jack, you can buy an adapter cable;

4. The knob can adjust both the volume and the switch of the product. Turning it clockwise can power on and increase the volume;

5. This product is a front stage operational amplifier and cannot be directly connected to the speaker. A rear stage operational amplifier needs to be connected.

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