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OLD THREAD Hi-end phono preamplifier by Andrea Ciuffoli

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#302
My main system is comprised of lm3886 chipamps. i have built various of these and are happy with their sound. I have had a krell collector here and he brought his ksa 50. To be honest we could not really here a difference between the chipamps and his ksa 50.
and he was very happy with the performance of the chipamps.


I guess this might be due to my speakers not being the most expensive. would like to try comparison between these on different speakers.

I am currently using a dual 1218 and an el cheapo behringer dj mixing desc running into my rotel rsp985 connected to the chipamps running wharfdale valdus 400 loudspeakers.

I want to take the behringer mixer out and get a better riaa preamp , that is why I decided to build a tube preamp and came upon this circuit.

I am not a crazy audiophile. I love building amplifiers and equipment.
I can't spend massive amounts of money on them.

I do realise that a very expensive attenuator will possibly have 0.0005% less distortion than using a plain 100k alps potentiometer but in the end everyting is limmited by my speakers. I will upgrade my speakers in the next 5 to 10 years.

These are the reasons that i will be happy with a carbon track pot ,because i honestly don't think i will be able to hear the difference.

One day everyone tells you you must use carbon resistors the next everyone says metal film.

I build my riaa stage acording to the original desing on the website using

100nF and 33nF wima caps and 4 2.2uF mkp10 wima caps and 1% 0.5W metal film resistors.

Listening to bread now.

It sounds great! Resolution (if that is a good description) is awesome. I am very happy!

On the behringer for some reason i keep on having to set the bass and treble to get clean sound, this needs NO filters. It sounds like I want it. Zero bass or treble need to be added or cut.

Current setup is

dual 1218 - tube preamp - rotel rsp985- lm3886 - warfedal valdus 400

In the next few months it will be:

dual 1218 - tube preamp with alps 100k attenuating - ksa 50 amplifier - valdus 400

Currently listening to my best of Bread Lp which is sounding much better with the tube preamp!

Is 40C too much for a toroidal transformer?
 

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#306
tangmonster said:
Current setup is

dual 1218 - tube preamp - rotel rsp985- lm3886 - warfedal valdus 400

In the next few months it will be:

dual 1218 - tube preamp with alps 100k attenuating - ksa 50 amplifier - valdus 400

Currently listening to my best of Bread Lp which is sounding much better with the tube preamp!

Is 40C too much for a toroidal transformer?
Click to expand...

Vinyl, bell-bottoms & lava lamps. I dig. Watch to not touch the reg or phono by accident when the room's light dims and the riffs play.

40C is quite OK for a toroid.

P.S. I would not be surprised if Smokie liked The Bread. OK surely The Ramones liked Smokie.🙂
 
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