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Old 22nd April 2008, 06:59 PM   #1
GlidingDutchman is offline GlidingDutchman  South Africa
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Default SLN Pre-Amp - Elektor Aug 1982

I want to attempt building this phono pre-amp (see attached schem).

Any tips and ideas on how to possibly improve the circuit?

I am going to configue it for MC cartridges.
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Old 23rd April 2008, 02:16 PM   #2
Shaun is offline Shaun  South Africa
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SLN Pre-Amp - Elektor Aug 1982
Hi GD

Isn't that a MC circuit?
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Old 23rd April 2008, 02:25 PM   #3
GlidingDutchman is offline GlidingDutchman  South Africa
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Quote:
Originally posted by Shaun
Hi GD

Isn't that a MC circuit?
Hi Shaun

It is switchable... by changing two resistors... R1 & R14

GD
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Old 23rd April 2008, 03:20 PM   #4
AndrewT is offline AndrewT  Scotland
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+55db of gain from an LTP+VAS single stage amp sounds quite ambitious.
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Old 23rd April 2008, 03:47 PM   #5
GlidingDutchman is offline GlidingDutchman  South Africa
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Quote:
Originally posted by AndrewT
+55db of gain from an LTP+VAS single stage amp sounds quite ambitious.
Andrew

A friend of mine built the circuit and used it with a Denon DL103 MC cartridge.

Any suggestions?

GD
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Old 23rd April 2008, 04:56 PM   #6
Shaun is offline Shaun  South Africa
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SLN Pre-Amp - Elektor Aug 1982
You'll have to add another stage; split the gain stages. Actually, that stage can be added in front of a regular MM preamp.
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Old 23rd April 2008, 05:03 PM   #7
GlidingDutchman is offline GlidingDutchman  South Africa
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Quote:
Originally posted by Shaun
You'll have to add another stage; split the gain stages. Actually, that stage can be added in front of a regular MM preamp.

Shaun

Care to post a block diagram of your suggestion?

What if the pre-amp works just like that?
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Old 23rd April 2008, 05:16 PM   #8
Shaun is offline Shaun  South Africa
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Quote:
Originally posted by GlidingDutchman
What if the pre-amp works just like that?
It does. It has an equalisation network. Sorry, I was not thinking. But nevertheless, it should be followed by another stage that excludes the equaliser.
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Old 23rd April 2008, 05:40 PM   #9
Shaun is offline Shaun  South Africa
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Quote:
Originally posted by GlidingDutchman
Care to post a block diagram of your suggestion
The last time we looked at this circuit, there was another similar one that had an additional op amp for a DC servo. I had ideas of using them together. But I can't seem to find that other circuit right now...
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Old 24th April 2008, 07:50 AM   #10
GlidingDutchman is offline GlidingDutchman  South Africa
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Quote:
Originally posted by Shaun


It does. It has an equalisation network. Sorry, I was not thinking. But nevertheless, it should be followed by another stage that excludes the equaliser.

Another full stage sans RIAA?
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