Another DIY SS Amplifier with NVA Boards

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SteveTheShadow
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by SteveTheShadow »

Almost fully cased up now:
DEC062CC-FAB7-417E-9A07-61FD9CFED4DD.jpeg
DEC062CC-FAB7-417E-9A07-61FD9CFED4DD.jpeg (59.7 KiB) Viewed 2527 times

Holes punched in top surface of case will be backed with aluminium mesh, sprayed black.
Still to decide on a front panel. Whatever panel I decide upon, will be attached to the Sony front panel we see in the picture.
It’ll be blank with the LED poking through a 4mm hole.
I’m pleased with the overall effect and though it took a lot of drilling, cutting, filing and bleeding; repurposing the old CD player case was worth the hassle and it’s good to recycle.
There's fixed bias, cathode bias, grid leak bias and confirmation bias.
All my amps use the latter :mrgreen:

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Latteman
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Latteman »

I like it Steve- what about an acrylic front- would look nice 👍🏼
Analogue Source -
Diy Turntable ,- Thorens Td321 donor
Diy tonearm- Well Tempered clone,
Benz Micro Ace L
Hitachi HT-660. Ortofon Vito mc
Nva Phono 1 MC board
Digital Sources- MF M1 Clic, Diy IDE cdp, iPhone 6s.
Amplification 2x Nva A20; A30 mk2; AP10H; Khozmo passive pre
Speakers- Diy full omni bipolar 8”/6.5” & R. Allan CB4; Ls5/3
Dc blocker to Nva mini BMU

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Latteman
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Latteman »

STS Mk2
Analogue Source -
Diy Turntable ,- Thorens Td321 donor
Diy tonearm- Well Tempered clone,
Benz Micro Ace L
Hitachi HT-660. Ortofon Vito mc
Nva Phono 1 MC board
Digital Sources- MF M1 Clic, Diy IDE cdp, iPhone 6s.
Amplification 2x Nva A20; A30 mk2; AP10H; Khozmo passive pre
Speakers- Diy full omni bipolar 8”/6.5” & R. Allan CB4; Ls5/3
Dc blocker to Nva mini BMU

Alfi
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Alfi »

Latteman wrote: Wed Jan 22, 2020 4:24 pm I like it Steve- what about an acrylic front- would look nice 👍🏼
Agree with this, classy and cost effective. I use these people...

https://plasticsheetsshop.co.uk/acrylic-sheet/


Alfi.
I am in the hi-fi trade.
Status: Manufacturer.
Company Name: Analogue innovation.

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SteveTheShadow
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by SteveTheShadow »

Alfi wrote: Wed Jan 22, 2020 5:28 pm
Latteman wrote: Wed Jan 22, 2020 4:24 pm I like it Steve- what about an acrylic front- would look nice 👍🏼
Agree with this, classy and cost effective. I use these people...

https://plasticsheetsshop.co.uk/acrylic-sheet/


Alfi.
That’ll do for me.
Thanks Alfi!
There's fixed bias, cathode bias, grid leak bias and confirmation bias.
All my amps use the latter :mrgreen:

Alfi
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by Alfi »

It's a pleasure Steve. A very interesting thread, (along with Karatestu's) on DIY'ing NVA SS amps.

I think they'll flame polish each edge for you too for a small additional fee.

Alfi.
I am in the hi-fi trade.
Status: Manufacturer.
Company Name: Analogue innovation.

TroutFisher
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by TroutFisher »

Yes, a great thread which begs the question, Paul, would you be willing to sell amp modules for those inclined towards DIY?

I appreciate this would be a return to a place Richard had moved on from, but with your new company model, could it be worth marketing? I’d certainly buy a pair of modules if you were willing and I know others likely to do the same.

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savvypaul
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Re: Another DIY SS Amplifier with NVA Boards

Unread post by savvypaul »

TroutFisher wrote: Wed Jan 22, 2020 9:34 pm Yes, a great thread which begs the question, Paul, would you be willing to sell amp modules for those inclined towards DIY?

I appreciate this would be a return to a place Richard had moved on from, but with your new company model, could it be worth marketing? I’d certainly buy a pair of modules if you were willing and I know others likely to do the same.
We see NVA as a whole package, based on a defined ethos...and our livelihood depends on it.

We like the DIY spirit, and we enjoy reading these threads, but it's not a market we are going to supply.
I am in the hi-fi trade
Status: Manufacturer
Company Name: NVA Hi-Fi
https://nvahifi.co.uk/

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Re: Another DIY SS Amplifier with NVA Boards

Unread post by TroutFisher »

I thought you would say that. Worth a try anyway😉

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SteveTheShadow
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Re: Another DIY SS Amplifier with NVA Boards

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Thought I’d put the electronic finishing touches to the amp yesterday and fitted 1uF film cap bypasses to all the power supply caps, like everyone says you should. I sat back, cued up a record and prepared to be enveloped on sonic bliss. Instead I got sandpaper and grit for treble and the whole tone of the thing was completely fooked up. Took them out and returned to liquidity and music.

I’ve never had much sonic success with bypassing PSU electrolytics; the sound was always degraded, despite what everybody else said. The output caps on the OTL were a different story; the improvements there were not subtle.
There's fixed bias, cathode bias, grid leak bias and confirmation bias.
All my amps use the latter :mrgreen:

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