Another DIY SS Amplifier with NVA Boards

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Dr Bunsen Honeydew
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Dr Bunsen Honeydew » Sun Mar 11, 2018 2:15 pm

As I said earlier (can't remember which thread), experiment with bypasses.

eagwok33
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by eagwok33 » Sun Mar 11, 2018 7:34 pm

SteveTheShadow wrote:
Sat Mar 10, 2018 10:52 pm
Review

The word that keeps coming up, with everything I'm playing, is "Authority"
This amp is effortless on my omnis. It takes whatever I throw at it and just plays without fuss or favour.
The presentation is very detailed, but never hard nor nasty, no matter how complex the mix gets, which means that it digs right into the core of the music and brings it out into the room.

Because I use omni speakers, it means I am into the "they are here" aspect of hi-fi rather than "you are there" and this amp certainly brings the music into the living room with aplomb. The top end is clear as a bell, utterly devoid of any hardness, fizz or grain and deals with all the subtle and complex percussion details of Latin jazz with a deft assuredness that is captivating.

Cymbals shimmer, rivets rattle, hi-hats tsssk, like live ones do. Shakers shik-a-shik and bongos start and stop on a dime....lovely.

The bass performance is detailed, fast and goes as deep and powerful as my speakers will go. The amp would certainly shift some air if it were connected to a set of 12" drivers.

Through my own speakers, electric bass plays tunes way down, whilst maintaining the attack of finger or plectrum on strings. This is particularly good on Bert Kaempfert, where he often uses an acoustic bass and plectrum played electric bass at the same time. The amp makes it easy to tell which is which, without the acoustic bass becoming lost in the proceedings...again lovely.

In the midrange, vocals are correct, with no nasality on females or hardness on black male singers of the Levi Stubbs and Dennis Edwards variety. Electric guitars, bark and growl and are beautifully textured, with the creamy distortion generated by Marshalls and Fenders, coming over unsullied. Big band brass blares convincingly, again with a subtlety and lack of distortion, that makes it very easy to turn the wick up to high levels without the music becoming conjested or muddy.

Nothing stands out and everything hangs together like few amps I've heard. I'm loving what it does.
Congratulations on the build Steve! :clap:
This seems to be a keeper. 8-) And great review, too!
If it sounds that good from the start, I believe it will be superb after a week of playing music through it. :)

Seems so that it's a good idea to try a NVA power amp one day on my horns :think:

Waiting for the A20x to be an available product... :epopc:

best, Norbert
Norbert

Tubes and Vinyl rule, Music rocks! :icon-wink:

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Dr Bunsen Honeydew
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Dr Bunsen Honeydew » Sun Mar 11, 2018 7:41 pm

Just had the first 3 back from Dave yesterday, so it is available. Dave said he didn't expect the difference but the 20x is clearly better. I haven't switched one on yet.

eagwok33
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by eagwok33 » Sun Mar 11, 2018 7:57 pm

Good news! :-)
And what would be the price for the A20x, Richard? And will it be available via Ebay or the forum?
Norbert

Tubes and Vinyl rule, Music rocks! :icon-wink:

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Dr Bunsen Honeydew
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Dr Bunsen Honeydew » Sun Mar 11, 2018 8:11 pm

Not on ebay yet, if you want one of these three just Paypal me £300.

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Dr Bunsen Honeydew
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Dr Bunsen Honeydew » Sun Mar 11, 2018 8:17 pm

Aaagh! forgot its got to go to Austria. I need £26 shipping cost as well.

_D_S_J_R_
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by _D_S_J_R_ » Sun Mar 11, 2018 8:52 pm

Dr Bunsen Honeydew wrote:
Sun Mar 11, 2018 7:41 pm
Just had the first 3 back from Dave yesterday, so it is available. Dave said he didn't expect the difference but the 20x is clearly better. I haven't switched one on yet.
I'm not very good at descriptions of this nature as 'audiophool speak' rears its ugly head, but I found the A20X just sounded a little clearer - better delineated? - than a standard A20, which I still love to bits for its engaging musical nature and the way it disappears from the reproduction chain as long as you're sensible with it. The 20X just helps make the music a little easier to follow I thought.

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Dr Bunsen Honeydew
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Dr Bunsen Honeydew » Mon Mar 12, 2018 12:37 am

Just been listening to eagwoks one. After 10 mins its a A20 after an hour something else, it takes a lot longer to run in that an A20. I always find this if you run two (or especially four) power supplies onto the boards. Anyway it sings, a very good replacement for the A30, just not a "difficult" speaker amp, you need to go to A40's or an A60 for that.

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Dr Bunsen Honeydew
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Dr Bunsen Honeydew » Tue Mar 13, 2018 1:00 pm

Soooo, comparisons with A20 and with the valve jobby.

You need to move on from LS2. I will have a search in my can't use or sell odds and sods box, what do you need in terms of length.

SteveTheShadow
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by SteveTheShadow » Tue Mar 13, 2018 3:55 pm

Dr Bunsen Honeydew wrote:
Tue Mar 13, 2018 1:00 pm
Soooo, comparisons with A20 and with the valve jobby.

You need to move on from LS2. I will have a search in my can't use or sell odds and sods box, what do you need in terms of length.
Compared with the A20 , the "NVA Inside" has a more solid presentation; more of the NVA characteristics, which means more detail, but at the same time, more musical, with a wider dynamic range. Maybe it is the big 225VA transformer and more capacity in the power supply, separate supplies for each rail?

Compared to the valve amp, there is more at the frequency extremes and more tune playing with a bigger, deeper soundstage. I would probably have to spend four figures on output transformers, to make the SET equal the performance of the "NVA Inside" amp.

I'd only need a 2m set of proper NVA cable.
DIY NVA amplification ( roughly equivalent to NVA A60) BTE Designs passive preamp, BTE Designs Lenco L75 turntable, Rega R200 arm, Goldring E3 cartridge, NVA Phono 1
Musical Fidelity M1 DAC, AppleTV4 with Apple Music subscription, ripped CDs streamed via WD MyCloud Home Duo NAS, with PLEX media server.
Speakers - Large sealed cabs, with Fane 12-250-TC 12" full range drivers.

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