Vinyl Recording - 24-bit, interface Q, processing

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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Folderol »

Then there was some idiot who built his own 3 transistor jobbie with passive EQ :oops:
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Martin Walker »

Oh no, surely not? :D
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Folderol »

Martin Walker wrote:Oh no, surely not? :D

It was a long time ago when young-ish and knowing even less about the subject than now
{sounded pretty good though}
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by ef37a »

Folderol wrote:
Martin Walker wrote:Oh no, surely not? :D

It was a long time ago when young-ish and knowing even less about the subject than now
{sounded pretty good though}

I guess you were seduced by the beardy,tweaky, subjectivist dark side Will! Passive RIAA was always technical nonsense.

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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Hugh Robjohns »

ef37a wrote:If anyone was contemplating building an RIAA pre amp the best IC is the NE5534 single op amp. Gives about the best noise performance at MM cartridge impedances.

It was what Quad chose for their 44 preamp (this shows the TDA1034, which was the chips name before it changed to NE5534). The switches shown select one of three different input sensitivities (1, 3 or 10mV for a 5cm/second groove velocity) and introduce a 180pF capacitance in parallel with the 47k input termination.
Quad44 disc preamp.jpg
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by ef37a »

Ah, well done Acoustical! I especially like the RF stopper at the front end but then would expect nothing less from them.

I understand the discrete 33 stage was not so clever?

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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by James Perrett »

I've been tempted to try building Doug Self's design - a two stage preamp using the 5534. He takes great pains to accurately implement the RIAA eq using standard parts.

There's a version of it at

https://www.markhennessy.co.uk/showpic. ... /Phono.gif

with a short description at the bottom of

https://www.markhennessy.co.uk/preamp/analogue.htm

but you'll need to read Self On Audio for a full description.
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Jorge »

Don't forget about physically cleaning the vinyl discs before you play them back. I have an old Nitty Gritty disc washing machine that makes a major difference in playback noise and pops, but there are other brands and types available. The main point is that most older vinyl LPs have dust and other foreign matter in the grooves that create a lot of the pop and scratch sounds on playback. If you try to remove as much of that as you can before playback you may not have to use so much noise reduction in post. Obviously you don't want to damage the surface and the microscopic grooves so you should use a well designed disc washing method.
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Hugh Robjohns »

James Perrett wrote:I've been tempted to try building Doug Self's design - a two stage preamp using the 5534. He takes great pains to accurately implement the RIAA eq using standard parts.

The Signal Transfer Company make several Doug Self designs available either as kits or ready-built and tested PC boards.

I have built the kit of his RIAA preamp (the balanced output version, but there is an unbalanced output version as well) and it performs superbly well. It also has selectable MM and MC inputs (the latter via a discrete transistor stage IIRC). If you're interested I could dig out the build manual and share the schematic?
RIAAbal3a.jpg
http://www.signaltransfer.freeuk.com/RIAAbal.htm
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by James Perrett »

I saw that one Hugh and thought about buying a PCB but I don't see myself ever going for an MC cartridge so much of it would be redundant. The circuit that I linked to is basically the MM part of that design without the balanced output. The biggest hurdle at the moment is finding a suitable power supply from my collection of junk that I can turn into a dual rail supply.
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Trevor Johnson »

I have just bought the balanced phono PCB, (007), from Douglas, who very kindly sorted out the supply problem, which is referenced in the link Hugh kindly placed. So I paid for two in the end, but am very pleased, nonetheless. And I have bought all the parts now: incidentally, if you want the SBS737 transistors, six are used in the MC stage, Nikko Electronics still have some for sale on their eBay site.

Back in 2012, I built another Douglas Self designed phono board, again MM/MC, but relay switched, together with a rather rarely used IEC, relay switched, correction facility. That board featured twenty six polystyrene capacitors and is part of the Elektor 2012 preamplifier, which Douglas told me a few weeks ago, is: "So far as I know it remains the quietest preamp in the world".

I shall post a pic of the completed preamp if you're interested.
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Folderol »

Yes interested :D
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Trevor Johnson »

OK, I read the sticky about posting pics, so will have a go!

Interior Self design preamp

Image

Front panel Self design preamp

Image

I've replaced the links with the actual pictures — you need to paste links to the actual images (ending with jpg/jpeg) and enclose them within the Img BB codes for the pictures to appear in the post — HR
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by Folderol »

Good to see nice tidy wiring :thumbup:
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Re: Vinyl Recording - 24-bit, interface Q, processing

Post by blinddrew »

Very neat! :thumbup:
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