5654W Vacuum Tubes 7-Pin
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5654W Vacuum Tubes 7-Pin
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Shipping Information
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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 military version vintage US-manufactured JAN 5654W vacuum tubes(2 PCS).
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5654W vacuum tubes for T20, P1, P2, Box X2, Box X4 audio devices. Substitute for 7-pin 6AK5/6AK5W/6Zh1P/6J1/6J1P tubes. It can also directly replace WE-403A/403B/EF95 and ordinary 5654.
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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.
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 are the differences in power outputs using the 32V and 48V power supplies?
- Using a more powerful power supply can help prevent distortion.
- Enables amplifier to drive larger, more powerful, or higher-impedance speakers.
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 have not received the order yet
but they got here!
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.
So far the "Tubes" sound as if the music is more full and richer....
As was mentioned previously, I also feel these tubes tame the upper frequencies. I like that they are shorter than the stock tubes too. I started to use this preamp after letting it sit for quite some time. I'm using it on a Yamaha R-N303. The receiver has a built-in phono stage but I needed to move my turntable away from the speaker area so I hooked up the Fosi Preamp and I am using a longer RCA cable to the receiver.
I was really surprised how much better this preamp performed. When I saw that there is an "upgrade" for tubes, I decided to give them a try. I'm happy with it.