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Fosi Audio Vacuum Tubes 7-Pin
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
We offer free worldwide shipping, except for certain regions such as Ukraine and Russia, where our services are currently unavailable.
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Customer Support
WhatsApp: +8613716612254
support@fosiaudio.com
Mon-Fri: 3:00 AM - 3:00 PM PST -
FAQ’s
If you have any questions, please refer here: FAQs
Product details
Description
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Each package contains a pair of fully tested and matched vacuum tubes (2 PCS).
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5654W vacuum tubes for T20, P1, P2, Box X2, Box X4. Substitute for 7-pin 6AK5/6AK5W/6Zh1P/6J1/6J1P tubes. It can also directly replace WE-403A/403B/EF95 and ordinary 5654.
- 6J1, 6CB6A, 6Ж3N, 6J5, 6Ж5N tubes are compatible with audio devices such as BOX X2, BOX X4, P3, GR40, MC331, and T20X MKII.
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Note: Replacing the wrong type of tube may damage your amplifier. If you are not sure this 5645W can be used as a replacement for your audio device, please check with your amplifier manufacturer.
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It has a fuller, wider sound stage. The treble is smoother and the bass is a little bit tighter. And you can hear some details that you did not hear before while listening to more complex music.
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Every package you get goes through our careful packaging. With 18 months warranty. If you have any questions, please feel free to contact us.




- All vacuum tubes have been fully tested and strictly matched.
- These vacuum tubes are compatible with audio equipment including BOX X2, BOX X4, P3, GR40, MC331, T20X MKII, etc.
- Using an incorrect vacuum tube model may damage your amplifier. If you are unsure whether these tubes are suitable for your audio device, please confirm with the amplifier manufacturer.
Specifications
Power Input
AC: 115V / 230V
Note:
115V setting supports 100–120V input
230V setting supports 220–240V input
Power Output
DC 1: 12V / 15V (Rated Power: 20W)
DC 2: 12V / 5V (Rated Power: 15W)
USB: 5V / 1A (Rated Power: 5W)
Operating Temperature
-20 ~ 40°C (-4°F ~ 104°F)
Temperature Rise Test
Temperature rise of 25°C (77°F) at full load
What‘s in the box?
- Fosi Audio PSU20*1
- 1.2m (47.2 in) DC-DC Power Cable*1
- 0.3m (11.8 in) DC-DC Power Cable*1
- User Manual*1
- AC Power Cord*1














