Comments on: VTV Amplifier Custom Input Buffer 1ET400A 1ET6525SA NC500 NC1200 NC2K Purifi Spin 3

By: Son

Son — Tue, 06 Feb 2024 21:53:30 +0000

Very nice buffer board. Also find it more cohesive than the Nord Rev D and just as cohesive as Nord Rev C, but can use more Op-Amp options.

Work well with the Sonic Imagery 990 enh and Weiss Op-2. Sonic Imagery has more low end and the Weiss is more open with better sound stage and clarity. About 5-10% difference in my system.

By: Victor

Victor — Tue, 06 Feb 2024 00:39:25 +0000

My Purifi amplifier was disconnected for some time while the SS2590 Op Amps were added. I find that Class-D amplifiers sound best when fully powered up 24/7. After the Op Amps were installed the bass control and detail were still there but not much overall difference. Two weeks later there was an “A-Ha” moment!

The VTV and the OP amps obviously need time to break-in and that took two weeks. Now instruments and vocals were better placed in the sound stage with a more natural sound. I can describe the sound as having better connective tissue.

I am now tempted to get into the rabbit-hole of swapping Op Amps with maybe the Sonic Imagery next and possibly the Staccato products.

By: Tony

Tony — Sat, 25 Sep 2021 10:51:11 +0000

Purchased these buffers with the SS2590 Pro opamps. Previously I was using the Purifi EVAL1 with the gain stage activated (OPA1612) which are pretty decent. Recently changed DAC and found the 10k input stage of the EVAL1 was holding things back a little, so finally decided to try these.

These with a 50k input impedance & 21db gain have much more effortless drive across all volume levels (something I was struggling with a little with EVAL1, which came alive at much higher levels db wise), whilst remaining natural sounding and non-fatiguing at very high levels. In particular I was surprised by how effortless transient response is with these buffers + SS2590 Pros.

No brainer, wish I had started with these to begin with to be honest.

By: Pete

Pete — Mon, 19 Jul 2021 10:40:29 +0000

VTV Custom Input Buffer

I was using the Purifi amps with Hypex factory buffer for the last 6 months.
It was time to try the Andrew Sparks influenced VTV Input buffer.
The improvement is profound. The music is just there ,at any volume level, hanging in space.
I remember reading an interview with Peter Lyngdorf. He stated the aim was to make “the best” a commodity. I’d say this has been achieved. Well done to VTV for playing their part is offering this buffer, improving the already great at a price any music lover can afford.

By: Rich G.

Rich G. — Sun, 26 Apr 2020 02:39:11 +0000

I purchased a pair of the VTV input buffer boards for my NC500
amps using the Sparkos SS2590 opamps and WOW.
I must add that I have been using the Nord RevD buffers and before that the Bellissimo Audio buffers. I had tried the SS3602 and preferred the SS2590 in each case. After installing the VTV buffers in low output configuration I was blown away. The amp was more cohesive with smoother overall performance and finer details also better bass.
My source is digital with a PS Audio Directstream DAC through a network bridge connected to an iMac I7. The preamp is a Wyred4Sound ST-P mod 2 with the Vishay Z-foil resistor ladder.
Speakers are B&W 804 and all Teflon/pure silver balanced cabling.
I also have the Hypex Ncore NC2K amps and and can’t wait to try the buffers on them but will need a larger chassis.
I was told that these buffers spec higher grade more stable parts
and the results show that.
Thanks.