Fosi Audio Vacuum Tubes 7-Pin
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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
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FAQ’s
If you have any questions, please refer here: FAQs
Product details
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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.
FAQs
Please read our FAQs page to find out more.
How to: Choose the right banana plug?
- Closed Screw Type. All Fosi amplifiers use standard-sized speaker terminals (4mm pins).
- Easy to wire up and solidly connect to amplifier and passive speaker.
- If they do not fit, use a little force to tighten the plugs.
- Fosi Audio Banana Plugs (Copper, Silver/Gold Plated): http://bit.ly/40Djq0U, https://bit.ly/3MkPL8t
- Please watch tutorial videos: https://youtu.be/6pYhoqDlvNw / https://youtu.be/RGvBgGAwS9k
How to Diagnose Power Supply Failure?
- The following situations may cause this issue
- Case 1: The LED on the power supply does not light up; Case 2: Amp/Preamp does not turn on; Case 3: When plugged into the Amp, both light on the amp & power supply start blinking; Case 4: Amp/Preamp make noise; Case 5: Sound shuts off by itself
- Possible solution
- Check if the power supply is illuminated when plugged into AC by itself.
Plug power supply into a different socket.
Test the adapter with a meter.
Try a different power supply (within a range of DC input).
Test the included power supply on other electrical equipment.
Please watch the tutorial video by clicking on the link provided. https://youtu.be/yCjygS03zTE
What is a GaN?
- The GaN supply has a power output of 240W.
- Offers overload and over-temperature protection.
- The 48V 5A GaN power supply is also available on Amazon.
I connected the Fosi between my AT LP120XUSB table and a Yamaha HTR-5960, not really expecting any difference in the output to the Polk tower speakers and 14" Polk sub, but I was amazed at the difference in output from albums I'd been playing from the 1970's.
Not only was the sound amazing at 45db setting, but I heard things on the tracks I'd never heard before.
I researched tubes for the Fosi and found an upgrade that everyone who bought one raved about. I decided to change them out and I was again pleasantly surprised by the output from the Fosi.
Who knew such a small device could make such a difference in sound?
Definitely deserves a 5 star rating.
I connected the Fosi between my AT LP120XUSB table and a Yamaha HTR-5960, not really expecting any difference in the output to the Polk tower speakers and 14" Polk sub, but I was amazed at the difference in output from albums I'd been playing from the 1970's.
Not only was the sound amazing at 45db setting, but I heard things on the tracks I'd never heard before.
I researched tubes for the Fosi and found an upgrade that everyone who bought one raved about. I decided to change them out and I was again pleasantly surprised by the output from the Fosi.
Who knew such a small device could make such a difference in sound?
Definitely deserves a 5 star rating.
Have to giving my glowing review of these upgrade tubes. The tubes that come with Box X2 (5654W), I would always here a crackling in the mids-hi range in frequency coverage. These have totally fixed that problem. The entire frequency range that is amazingly defined.
Have to giving my glowing review of these upgrade tubes. The tubes that come with Box X2 (5654W), I would always here a crackling in the mids-hi range in frequency coverage. These have totally fixed that problem. The entire frequency range that is amazingly defined.
Good replacement good fit great sound quick delivery good package
I was able to change it my previous 5725W tubes with these 5654W tubes and the sound is awesome!
I was able to change it my previous 5725W tubes with these 5654W tubes and the sound is awesome!
Replaced the factory tubes with these and it made a sound improvement I could here! Thanks.
Replaced the factory tubes with these and it made a sound improvement I could here! Thanks.
They work great, good sound!
They work great, good sound!
To my ears they improved the sound quality on my X2
To my ears they improved the sound quality on my X2
Hi Fosi,
The device sounds great, but the biggest drawback for me is the lack of an option to select the output signal. Both the RCA and headphone outputs are active at the same time. A switch between RCA and headphone output would be very useful. Possibly an option to have both active simultaneously as well, although I think that might not be necessary.
Hi Fosi,
The device sounds great, but the biggest drawback for me is the lack of an option to select the output signal. Both the RCA and headphone outputs are active at the same time. A switch between RCA and headphone output would be very useful. Possibly an option to have both active simultaneously as well, although I think that might not be necessary.
Great upgrade. Deeper richer sound.
Great upgrade. Deeper richer sound.
Happy customer
Happy customer
I wasn't sure exactly what to expect from this tube upgrade. I was pleasantly surprised! Strained vocals are now smooth. You can really hear the music fill the room. A worthy upgrade! Completely sealed my faith in using tubes to enhance the listening experience
I wasn't sure exactly what to expect from this tube upgrade. I was pleasantly surprised! Strained vocals are now smooth. You can really hear the music fill the room. A worthy upgrade! Completely sealed my faith in using tubes to enhance the listening experience
I was happy with my purchase took a little time to get , very professional packaging and nice quality;it’s build
I was happy with my purchase took a little time to get , very professional packaging and nice quality;it��s build
I love the GR70 Head/Pre Amplifier and Fosi has the best price for matched 5654W vacuum tubes. Now I have replacement tubes in the event I need them.
Than You Fosi Audio
John
I love the GR70 Head/Pre Amplifier and Fosi has the best price for matched 5654W vacuum tubes. Now I have replacement tubes in the event I need them.
Than You Fosi Audio
John
I've purchased these tubes for backup on Fosi model # MC331 . WOW ! I can't believe the quality of sound & versatility MC331 model offers ! The unit sounds great as a stand alone device ( with a decent set of speakers ) or used as a pre-out for an old school solid state integrated amplifier. You could very easily spend 20 times as much & not get such satisfaction !
I've purchased these tubes for backup on Fosi model # MC331 . WOW ! I can't believe the quality of sound & versatility MC331 model offers ! The unit sounds great as a stand alone device ( with a decent set of speakers ) or used as a pre-out for an old school solid state integrated amplifier. You could very easily spend 20 times as much & not get such satisfaction !
I have not received the order yet
I have not received the order yet