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Old 22nd September 2011, 10:08 AM   #17481
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I've not been 100% happy with the new dos sound. It still has less 'air' and hardness to the sound that I never had before.

Today I have swapped the BC550 (T5) for the current drive on the fets to a 2sc2240 as used on the older dos. The sound is now so much more composed, more linear, more composed and more 'air'.

I recommend people try this.

I am going to try a set of 2sa970 or 2sa1085 instead of the BC560 on the CFP

Brent
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Old 22nd September 2011, 10:41 AM   #17482
Thomo is offline Thomo  United Kingdom
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I was at Brents place to witness this last change.

I have to say that the improvement is dramatic. There is much more clarity, smoothness and detail. The edge that was present in drums, cymbals, pianos etc is now massively better.

Pretty startling to be honest.

Lee
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Old 22nd September 2011, 10:51 AM   #17483
UV101 is offline UV101  England
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Ray's still got one set of old DOS boards left!!!
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Old 22nd September 2011, 10:53 AM   #17484
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Nothing wrong with the new board as it's the same basic cct and you can mess around with it. Going to try the 2SA1085 in a while

Brent
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Old 22nd September 2011, 11:42 AM   #17485
SimontY is offline SimontY  United Kingdom
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Some have said that transistors can make the single biggest difference in terms of component selection.
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Old 22nd September 2011, 11:47 AM   #17486
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I fully agree in this instance.

Fitted the 2SA1085 in place of the BC560 and it is now making music again!

Brent
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Old 22nd September 2011, 12:49 PM   #17487
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This is now my current configuration. The 2SA1085 and 2SC2240 have really improved the sound.

Click the image to open in full size.

Brent
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Old 22nd September 2011, 01:43 PM   #17488
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Quote:
Originally Posted by Fidelity Audio View Post
This is now my current configuration. The 2SA1085 and 2SC2240 have really improved the sound.

Click the image to open in full size.

Brent
hiya brent
being a bit of a noob is this mods to the cfp dos are the parts available at say rs ?
cheers alan
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Old 22nd September 2011, 01:46 PM   #17489
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Yes they are available from RS

Brent
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Old 22nd September 2011, 01:52 PM   #17490
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The old boards are 6 euros each at the mo cfps 12euros, Never gone discrete much improvement over lm4562s.
alan
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