there is an advantage in all cases by using of SMPS, where an indoor power supply and transformer is in use near by the line/RIAA unit (in opposite to a classical 50 Hz transformer).
But the use of a power supply in the same housing (i. e. near by the voltage amplifier stages) is generally considered by me to be very unfavorable, even by power amplifiers.
By an outdoor power supply I don't prefer SMPS by the currently available clock rates.
Nevertheless most brands don't prefer seperate outdoor power supplies (unfortunately).
Great work. Unfortunately the showed device is the PCB of the line/phono preamplifier model "KAIRN" and not that one from LINTO. The still needed Schematic is that one of the SMPS device from LINTO.
Here some additional pictures of the first picture from there, found about Linn Brilliant SMPS - naked! - pink fish media
(except the last pic - from this version I need also a schematic diagram).
Attachments
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Thanks for the comment. In my case I do not have a RIAA stage but I am considering to take it out - I don't like the present arrangement. Will be easy to make a separate housing next to the preamp. Not an easy job with my three LK 100's but the most difficult is to take the decision - afterwords just copy-paste.
Cheers,
Just a matter of curiosity - and my transistor circuit theory is rather rusty:
Perhaps one of you learned folk can answer the following.
If I look at the input circuit of the Linto signal circuitry (attached to the first post of this thread), I am puzzed. The very first signal transistor - when the audio comes from the moving coil cartridge does not appear to have a built in DC bias. The base is effectively floating being isolated from the outside world by a couple of capacitors.
How can this be? I thought stable transistor circuitry required a stable bias??
Sorry for what might me a dumb question to some of you...
don
Perhaps one of you learned folk can answer the following.
If I look at the input circuit of the Linto signal circuitry (attached to the first post of this thread), I am puzzed. The very first signal transistor - when the audio comes from the moving coil cartridge does not appear to have a built in DC bias. The base is effectively floating being isolated from the outside world by a couple of capacitors.
How can this be? I thought stable transistor circuitry required a stable bias??
Sorry for what might me a dumb question to some of you...
don
Hi, you can try using an R-core transformer instead - I have changed the toroid in the KAIRN for this one.
Regards
yes, like used in the first editions of that models.
I am still looking for the schematic of the SMPS from the Linto.
Definitively it is a right step ahead IMHO. Will post here the whole story of my mod I am very cslose to finalize-long story At the moment it is singing like a bird.
Cheers
No. You need additional a rectifier bridge or four pieces of high speed diodes, capacitors and voltage regulator, both for positive and negative voltage rail. Instead a serial regulator I would prefer a parallel regulator. And instead one supply for both channels I would prefer two monaural power supplies to optimize the GND management.
no one here who has now opened this module and drawn the schematic diagram?
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Fully agree but I have just replaced the diodes with hyper fast ones paralleled with 0.1 uF and simply delivered the required voltage by an R-core trafo - works fine so far.
From the experiment I have just done, you should build an analogue (regulated) PS which supplies the same DC voltage as the Linto SMPS does ... it will sound better!
(A SMPS is used for cost & size reasons - not SQ!)
Regards,
Andy
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Sorry I am late, it was long time ago and I do not remember exactly the voltages but you can see the photos and judge what to do - definitely new hyper fast soft recovering diodes /Fairchild/ and an R-core trafo.
Regards,
Ignat
