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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 24th June 2018, 07:59 PM   #621
Seegs108 is offline Seegs108  United States
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I just want it to be as quiet as possible and I don't mind spending a little extra on Noctua fans as they're regarded as some of the quietest out there.
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Old 24th June 2018, 08:11 PM   #622
PJN is offline PJN  United States
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I just picked up some computer fans, check dB specs, and a cheap wall wart psu. I was out maybe 30 bucks, Justin layed the fans on top of the heat sink find. Very silent. As The mighty Zen says just do it.
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Old 24th June 2018, 08:15 PM   #623
Seegs108 is offline Seegs108  United States
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Quote:
Originally Posted by PJN View Post
I just picked up some computer fans, check dB specs, and a cheap wall wart psu. I was out maybe 30 bucks, Justin layed the fans on top of the heat sink find. Very silent. As The mighty Zen says just do it.
Thanks! Yeah, that's my plan. I'll probably order everything tonight.
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Old 24th June 2018, 08:50 PM   #624
mr_whocares is offline mr_whocares  Germany
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Default short review

my sony vfet amp has now more than 100h of burn-in time and i would like to share my impression of its sound.

first , i have to say that the most important factor of a sound system to me is how emotional a system plays and how the music touches me. this "feeling" is given when the sound of a system is a completely " rounded piece of work", despite all weaknesses of each individual unit in the system. so , fine-tuning of a set-up incl. the listening room is essential to me to "snap in" the sound;-)

i own different amps (transistor and tube) , but most of the time i listen with 2x SET 300b mono-blocks equipped with WE tubes. as pre amp i switch between two passive units; a TVC and a precision wire-wound potentiometer. my source is a nos dac running on batteries. the speakers (102 dbw/m) are open-baffle wide-range with additional horn-loaded dipole tweeters and active dipole sub woofers. the cables (mains and interconnects) are mostly silver. the whole system runs on its own mains separated from the rest of the house.

the sony vfet amp has received a nice base and i installed the chassis on 3 special feet similar to shung mook diamond resonators. ( to be honest i am not a fan of this hifi2000 housing that i am using now and i will replace it in the future with a self-made more suitable one ;-) )

some other chassis tuning steps were needed to balance and match the sound of the amp into the whole set-up. many different mains cable and fuses were tested to find the most suitable one for matching/integrating the amp into the system, etc.

findings:

- very natural sound colour / sound spectra

- excellent speed and timing

- it reproduces perfectly the "air" around the instruments and in the recording studio

- very natural and airy vocals

- the spatial rendering is excellent in all dimensions, especially in the depth. instruments in big orchestras are fixed placed and can be pointed deep in the hall.

- excellent base and low frequency texture

- surprising warm and soft sound for a transistor amp

- excellent dynamic in all frequency range. the "rise" and "fall" characteristic of the tone ( transient behaviour) is superb.

- very high resolution


just two remarks:

the sony vfet amp delivers in my system a bit less presented lower-mids. furthermore, i also look for a more "shininess / brilliance" in the highs. those aspects are more pronounced with my 300b. i have to admit that these attributes could be just because of the microphony effect of the tubes, never the less, these factors contribute to enjoy my music.

any way, i think these are also a question of fine-tuning and can be done with a suitable chassis/PCB resonance treatment, choice mains and interconnect cables, fuses , voodoo stuffs, etc. (for example, hifi tuning fuse corrected this unbalance in low-mids but i then missed the nice "soft" highs :-) . excellent strong , dynamic , balanced and natural sound i could achieve with the combination of a shunyata anaconda mains cable and my diy silver fuse . however, the shunyata cable does not belong to me :-( and i prefer to enjoy the system using my diy stuffs ;-) ... :-D .... )

my opinion and conclusion: a beautiful amp! ... it competes/wins not only my 300b in most aspects but also many other high-end amps that i have heard! many thanks nelson and the force may be with you!
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Old 24th June 2018, 08:54 PM   #625
Zen Mod is offline Zen Mod  Serbia
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Sony Vfet Illustrated build guide
His Force is certainly stronger than fuses

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Old 24th June 2018, 08:57 PM   #626
mr_whocares is offline mr_whocares  Germany
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His Force is certainly stronger than fuses

how true! :-D
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Old 11th July 2018, 04:50 AM   #627
Seegs108 is offline Seegs108  United States
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I finally received all the parts necessary for my near-silent DIY cooling solution. Two Noctua NF-S12A ULN fans, one molex to two 3-pin fan connectors and a 1 amp 12 volt power supply with a molex connector. I didn't realize when ordering it, but the power supply shipped from China so it took about 2 weeks to arrive. I wondered why it was so much cheaper than the rest of the same spec'ed ones.

The only thing I hadn't worked out was how I was going to mount the fans to the chassis. Then it dawned on me to just secure them to the chassis with one of the hex bolt holes already on the back of the chassis on each side. I just needed to find hex bolts long enough now to go through the fan housing as the stock ones weren't long enough to go through the fans and still thread in. Luckily I had a couple laying around that ended up working. It's been running for about 30 minutes and I'm already down 30 degrees F. 105 vs 135 degrees F. The only thing I may do after this is spray paint the fans matte black so they don't stick out as much. Not bad for a less than $50 project.

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Last edited by Seegs108; 11th July 2018 at 05:06 AM.
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Old 11th July 2018, 09:31 AM   #628
Zen Mod is offline Zen Mod  Serbia
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Sony Vfet Illustrated build guide
that's ugly

Babysitter is Fugly!

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Old 12th July 2018, 02:38 AM   #629
Seegs108 is offline Seegs108  United States
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It does an incredible job at keeping my amp cooler. Much, much cooler. I think it's because they're cooling the heatsink fins directly. For reference, how many degrees does babysitter reduce the amp by?

Once I paint them matte black it won't be quite as ugly. Plus I'm normally the only person who sees the amp. My partner rarely steps foot in the room with my audio equipment.
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Old 12th July 2018, 03:59 AM   #630
Zen Mod is offline Zen Mod  Serbia
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I was joking ..... do your own - in your way , of course

I never measured , but I can estimate Babysitter is decreasing temp somewhere between 5 and 10C

difference between me being concerned and totally indifferent
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