Will this preamp REALLY improve your class D amp? 

Are you adding the P3 to your system?

I own this device and yes the tubes do definitely change the sound. 1st I switched to the GE Jan tube upgrade tubes, at first, they were similar, but tubes take hours to open up, after 30 hours, the soundstage started growing, after 100 hours the soundstage was much larger, and the gain also improved a lot, I was getting the same db output at 1/2 volume as I was at 2/3 volume! Huge midrange and some upper range improvements, had to increase subwoofer output to balance.lastly, I upgraded to hand made Mullard tubes, after 30 hours, even larger soundstage and more gain! Gentleman, tubes take time to grow up,lol. You cannot judge tubes that are not broken in, and the stock tubes are not the best, but after 100 hours, they definitely sound different.

Agree. One input is not enough. At least 2 would be ok.Tube pins come misaligned from factory. They need to fix that. I have 3 Fosi P3's. 3 different applications. But I love the sound it gets and adds to all 3 applications I use them for. Very spacial stereo separation with a nice warm bass tone is how I would describe the sound. I'm sure it's the tubes and the chip inside that give it that sound. Surprised you couldn't hear much of a difference. The sound is the reason I got 3 of these. I tried the Foo Box X4 Phono Preamp and I sent it back. Made my Kenwwod KA=3500 and large Advent speakers sound worse. Yes, very old school simple setup. Not audiophile by any stretch of the word. ;-) Phono Preamp on the Kenwood sounds much better. I'm a musician so I record on my Mac using Logic Pro X and an Onyx Producer. 2/2 Audio Device with a DAC. Using the Fosi P3 in this setup is perfect. Great videos and info btw,

I have a Fosi P1 that I was going to use as a buffer to get the "tube sound" in my system. I connected it to my tape monitor loop and with my remote control I could instantly switch it in and out of the system. I couldn't hear a difference. I even tried some better GE tubes. Same thing. I do like glowing tubes though and having tone controls on the Fosi give me a preset tone control without having to get up. LOL

I also have the V3 & P3 and share your preconceptions of what a preamp should do. V3 owners could use more inputs and perhaps Bluetooth and remote control. In some systems added gain (because the V3 sensitivity is lower than average) and Bass/Treble would be a plus. The issue is, V3 buyers often are fans of its premium parts and low distortion measurements. Tubes add distortion, it is their benefit, so they are perhaps a different group. I think the Nobsound NS-08P Pro (hard to find) with relay volume, 4 Inputs, and remote fits better into my view of a matching preamp. Thoughtful Review / Subscribed.

Yes, forever, the p3 sounds great, if you have the time to let the tubes burn in.

You should a "control" tube preamp of higher quality and hear the combo again. If you cannot hear the difference, then it is you.

Did you unscrew the orange collars to insert the tubes...as explained in the manual...?😖

Radio Shack sold a little black box w/ 3 rca inputs and 1 rca output, & 1,2,3 selct switches.

So I had the v3 for a bit. Really good but didn’t seem to be ideal for my setup. I got the Emotiva a2m and I love it! Wish it had a remote but alas. I do love the looks and small form factor of the Fosi line.

Does it improve sound quality?

Fosi ZA3 monoblocks and balanced preamp coming!

Can this power headphones and two amps at the same time with an aux to rca splitter for the 2nd amp?

can you source from multiple bluetooth? Does it remember multiple bt devices?

So glad to also hear that I was not the only one having issues inserting the tubes! Not a good experience trying to get the P3 set up. A little frustrating and disappointing.

Why not connect the preamp most people wll have (I have a NAD) to the Fose V3, or any Fose?

RCA connectors are old-fashioned connection methods for connecting an antenna connector (rca) that receives radio frequencies to your preamplifier. Today, 2024v there are completely different and better ways to digitally connect different audio sources than with analog ones. Why do too many simple people live in ancient times without realizing the importance of the matter in relation to their own time?

Hi nice video, thanks. Wich RCA cables (min 2:34) are you using ? they seem a little better than basic ones, white and red, but thicker...

glad to hear that I was not the only one having issues connecting the tubes.

🦃🍁🦃🍁🦃🍁🦃 Happy Thanksgiving! 🍁🦃🍁🦃🍁🦃🍁

Great video! What are differences in sound quality between Wiim mini and Wiim pro(if any) using it only as a streamer?

The "tube sound" is a touch of second harmonic distortion. This preamp would be better with an adjustment knob in the tube stage to make it less linear, so one could adjust from clean to dirty.

Which power amp have you got associated to the PrimaLuna EVO 100 and the Schiit Saga preamps? You won't use them with the Fosi V3 I guess. 😁 What would you think of these paired with a good class D amp such as a Purifi?

How would you compare the Fosi V3 VS the Aiyima A08 Pro. I know you have had issues with the A08 Pro in the past. Currently I have been running the A08 Promo on my secondary Rig 100% Vinyl Twin Pioneer PLX-500 Pioneer DJM-450 mixer that is basically my phonostage to switch between the two TT.

I've seen quite a few reviews on the V3 and P3 and after watching yours I'll probably pass on both. I noticed you've got the Audiolab 7000CDT I've got the 6000CDT. Are you getting the 3D sound your talking about?

It's not ideal, but sometimes a RCA A/B switcher module comes in handy 😉

Would a switch work to switch input or would that lower the audio quality?

Very balanced review. I bought the V3 because it was too cheap to worry about price. I never intended to use it in a main system, and it couldn’t drive my LS3/5A variant speakers despite the reported output wattage numbers. I think the P3 is aimed at single source bedroom or office systems alongside the V3?

You can literally get an RCA switcher for 10-20 bucks

Yeah unfortunately it seems like it is getting much harder to find a true tube preamp that gives the holographic 3D sound anymore ...

I'd be more interested if it did NOT have the tubes

I agree with you, the P3 is not a real preamp at all as plugin options are a must. The tubes are almost a complete deception that many companies are getting onto now for customer marketing trickery.

Short answer - NO. Tubes work on high voltage - not on 12VDC. This is a fake tube amp.

id say its bull ur just adding to the noise.. digital signal.. digital amp.. dont need anything more.

I have a 35 yrs old DENON DAP-5500. It rocks. I don't like those small toys... sorry :))

These and all those other similar types are NOT quality gear. My Fosi audio X3 has fake NE5532 Op Amp ICs in it and the electrolytic capacitors are of known fake brand from China. The NE5532s are used in the tone control circuit, which itself is also crap. There is no way to set them flat. Oh wait, you set them at 12 oclock, nope. These are just cheaply designed gear to "have a look" trying to mascarade as quality. Yeah it is a preamp, although with only one input???, These are really just cheap crap gear.