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Old 17th June 2018, 10:04 AM   #1
vzaichenko is offline vzaichenko  Russian Federation
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Join Date: Jan 2010
Location: Moscow, Russia
VHex+ amplifier modules, kits and boards
Arrow VHex+ amplifier modules, kits and boards

VHex+ started as a fun project and grew into a mature line of amplifiers.
This is a great sounding amplifier, built and appreciated by many people around the globe. Very inexpensive for the level of sound quality it provides.
It's easy to build and very reliable in the long run.

Key specifications with +/-50V rails (VHex+ Classic):
- Maximum output power: 100W @ 8 ohm; 160W @ 4 ohm
- Voltage gain 29db
- Input impedance 27 Kohm
- THD: 1KHz - 0.005%, 10KHz - 0.008%, 20KHz - 0.01% (measured at 50W @ 8 ohm)
- IMD: 14+15KHz - 0.005% (measured at 50W @ 8 ohm)

For VHex+ Classic we offer (note - the price is for a pair!):
- Assembled modules for a stereo amp (without or with the heatsinks);
- Kit for a stereo amp (PCBs + parts);
- Boards set for a stereo amp (PCBs only).

A recent addition to VHex+ product line:
- TubeHex boards set with the tube-based IPS.

PSU boards and Control / Protection System variants are also available.

We provide a comprehensive building guide and technical support for every build.

We do care about the result.

Cheers,
Valery & Jeff

Virtual Zero Audio Store

P.S. 10% discount for your 1-st order (use "welcomefriends" discount code at checkout), valid till August 31, 2018.
Attached Images
File Type: jpg VHex+ reference.jpg (706.5 KB, 521 views)
File Type: jpg fe47c3_78369231bd51402689bd428ea73713a8-mv1.jpg (123.4 KB, 526 views)
File Type: jpg fe47c3_2293d6d284ca41b1bfadc10a7ad929a3-mv1.jpg (291.6 KB, 509 views)
File Type: jpg TubeHex 1.041.jpg (354.9 KB, 494 views)
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Last edited by vzaichenko; 31st July 2018 at 12:03 PM.
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Old 19th July 2018, 05:33 AM   #2
dtaylo3 is offline dtaylo3  United States
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Location: coloradao usa
links do not open for me
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Old 19th July 2018, 05:47 AM   #3
vzaichenko is offline vzaichenko  Russian Federation
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VHex+ amplifier modules, kits and boards
Quote:
Originally Posted by dtaylo3 View Post
links do not open for me
Hmm... that's pretty strange.
If you just go to Virtual Zero Audio Store - does it open at all?

The site is hosted at Shopify in the US - works fine for me.
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Old 23rd July 2018, 09:34 AM   #4
fred sonnen is offline fred sonnen  Germany
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Hallo Valery

A few questions:
What is so special with your solutions?
Why should I buy your VHex+ amps.?
What is the different between the TubeHex and the Classic? Technically and sonic wise ;-)
Why do you think tube at the input stage is a good/ better solution?


greetings
F.S.

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Old 24th July 2018, 01:08 AM   #5
vzaichenko is offline vzaichenko  Russian Federation
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Location: Moscow, Russia
VHex+ amplifier modules, kits and boards
Quote:
Originally Posted by fred sonnen View Post
Hallo Valery

A few questions:
What is so special with your solutions?
Why should I buy your VHex+ amps.?
What is the different between the TubeHex and the Classic? Technically and sonic wise ;-)
Why do you think tube at the input stage is a good/ better solution?


greetings
F.S.
Hi Fred,

VHex+ is a combination of simplicity and very high performance.

This design has got a number of specialties:
- the front-end, combination of the LTP, Lender arrangement and a current-driven VAS. It's highly linear, low internal noise, immune to external noises.
- OPS is simple, well temperature-compensated, low-enough distortion and rather inexpensive.

Many builders and testers appreciated the natural, uncolored sounding of VHex+.

The tube at the input is a matter of taste. It's a good input device in general. Both options perform very well, although I didn't run any thorough A/B test.
If you dare to compare them - please share your impressions

In addition - we support every build, making sure the amplifier works as expected. We do care about the result.

Cheers,
Valery
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Old 24th July 2018, 06:17 PM   #6
vzaichenko is offline vzaichenko  Russian Federation
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VHex+ amplifier modules, kits and boards
Impressions by Gregory G. - one of the owners of VHex+, who performed a very good build:

VHex+ clean build, Greg G. (US) – Virtual Zero Audio Store

Cheers,
Valery
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Old 30th July 2018, 09:41 AM   #7
J.M.K is offline J.M.K  France
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Location: France
Hi !

I'm interested in your "Simpelstark PLUS V1.3 kit (2 x PCBs + parts)"

As I fried some time ago (stupid accident) one module/board of my dual-mono power amplifier, I already have a chassis with everything inside:
2 SMPS PSUs +/- 47.5 V unregulated (is this OK with your boards)
speaker protection, heatsinks etc

Is it a class AB setup ? What type of mosfets are you using ?
What's its damping factor ?

Thanks

JMK
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Old 30th July 2018, 02:22 PM   #8
vzaichenko is offline vzaichenko  Russian Federation
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VHex+ amplifier modules, kits and boards
Quote:
Originally Posted by J.M.K View Post
Hi !

I'm interested in your "Simpelstark PLUS V1.3 kit (2 x PCBs + parts)"

As I fried some time ago (stupid accident) one module/board of my dual-mono power amplifier, I already have a chassis with everything inside:
2 SMPS PSUs +/- 47.5 V unregulated (is this OK with your boards)
speaker protection, heatsinks etc

Is it a class AB setup ? What type of mosfets are you using ?
What's its damping factor ?

Thanks

JMK
Hi JMK,

Simpelstark is a rather special amplifier. The "core" of it is an ultra-linear amplifier with the "standard" 29db voltage gain and no global feedback loop.
On top of that, it's equipped with Only Distortion Negative Feedback (18db loop gain), crystallizing the error signal and injecting it at the input of the OPS, mixing it with the VAS signal at 180 degrees phase shift. That's the point where the error signal is subtracted from the VAS output signal, although it corrects the overall error of the amplifier, as this kind of arrangement is equivalent to the global loop of 18db in principle.

The amplifier provides very natural sound throughout the whole audio frequency range without any coloration or "highlighting" any parts of it. We call it a "Delicate Sound" amplifier. Real hi-end

This is a class AB setup, but the OPS arrangement is sort of non-standard - its a "constant gm" type of OPS with the EF driver stage running at 110mA of quiescent current (class A), and then a couple of pairs of common emitter "supporting" transistors, running at just 20-30mA each.

The output impedance of the amplifier is close to 0.05 ohm, resulting in the damping factor of around 150 with 8 ohm speakers. I deliberately keep it not too high - too much of control over the speaker is not always good. In general, "the more is the better" statement is incorrect with regards to the damping factor.

+/- 47.5 V DC unregulated is ok, although we have never practically tested this amplifier with SMPS power supplies. I don't see any issues though.

We don't use any MOSFETs in this version of the amplifier - the OPS purely consists of the BJT power transistors (one pair of 0281/0302 and two pairs of 3281/1302 in each channel).

IPS requires one pair of 2sk246/j103 jFETs, relatively rare, but still available these days.

The kits are available in our store.

Let me know if you will have some more questions

Cheers,
Valery

P.S. BTW, you can see an overall topology in the comments to my post on FB:
Just finished testing and measuring the... - Virtual Zero Audio Store | Facebook
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Last edited by vzaichenko; 30th July 2018 at 02:43 PM.
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Old 30th July 2018, 02:28 PM   #9
andrewlebon is offline andrewlebon  India
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Hello Vaizchenko
greetings all parts for the simplestark pcbs have arrived managed to
get matched input mosfets BL grade waiting for the construction guide and setting
up procedure from you
warm regards
Andrew
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Old 30th July 2018, 02:34 PM   #10
vzaichenko is offline vzaichenko  Russian Federation
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VHex+ amplifier modules, kits and boards
Quote:
Originally Posted by andrewlebon View Post
Hello Vaizchenko
greetings all parts for the simplestark pcbs have arrived managed to
get matched input mosfets BL grade waiting for the construction guide and setting
up procedure from you
warm regards
Andrew
Hi Andrew,

Good news
OK, I will intensify my work on the building guide for Simpelstark PLUS - hope to have it finished in a few days.

Cheers,
Valery
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