Collection of mods for Beresford TC-7520

**Adrian B** · 22-06-2009, 22:18

There looks from the pictures of the pcb to be a host of possibilities for changing caps and resistors to one's favourite boutique brands (I like Kiwame Rs myself which seem to remove a bit of digital glare, plus Elna Silmic or Cerafine caps). Of course, with this killer DAC there may be no glare to remove!

Adrian

**Gazjam** · 24-06-2009, 11:56

Great Post Leo

Good to have the mods all in one place.

I'm running the 4032 for Line Out and the 4562 for HPA.
I didn't know about the MLC5 and 6 Mod...interesting!

I prefer the 4032 to the 4562 for the Line output....I wonder if theres any milage in removing the MLC caps when using a 4032??

Any thoughts anyone or has anyone tried it?

*Fitting plugin Op amps is easy enough..I dont fancy having to resolder the caps back in again!!

Thanks.

**StanleyB** · 24-06-2009, 13:13

I have been trying out some mods on the line output and the HP output. The line output one is quite interesting. Remove MLC5/MLC6 and add a 4.7nF cap across the resistors.
This mod was in response to my tests against the DAC1 latest version.

**Shanedudddy2** · 25-06-2009, 02:36

What difference does adding the 4.7nF capacitors make, may i ask?

**StanleyB** · 25-06-2009, 19:41

Try something like some polypropylene types instead of the ceramics. What it does I leave to you to notice

.

Stan

**lovejoy** · 27-06-2009, 08:17

Hi Stan,
Have just tried a couple of 47nf Polyprops as per your mods above, and with them in place I'm getting a rather loud hissing with the music playing in the background. Removed MLC8/9 as well, just in case that had anything to do with it, but still the same. Have removed the new caps for now and everything is OK again.

**lovejoy** · 27-06-2009, 08:19

Oops.. Just realised my mistake... 47nf, not 4.7nf...

**scrufftyguy** · 27-06-2009, 08:30

Hi everyone!

I'm considering ordering a TC-7520, what would people recommend as the best mod to carry out? At the moment I don't think I want to risk any soldering, so I guess that limits me to swapping the op-amps. I just ask as I need to order some coax cable and the seller also sells the LM4562NA. Should I chuck a couple of those in my basket at the same time, or is there another op-amp that's regarded as the better option?

I've had a scan through this thread but as a complete novice I thought I'd best ask out-right!

Thanks.

Ade

**StanleyB** · 27-06-2009, 12:55

Originally Posted by lovejoy

Oops.. Just realised my mistake... 47nf, not 4.7nf...

Abort the 4.7nF operation. I'll pull the picture soon. I sussed out that I have a different mod under the PCB that is not visible on top, which is causing the hiss.
The MLC5/6 is however still valid. Far smoother piano and guitar decays.

Stan

**StanleyB** · 27-06-2009, 13:05

Originally Posted by scrufftyguy

I just ask as I need to order some coax cable and the seller also sells the LM4562NA. Should I chuck a couple of those in my basket at the same time, or is there another op-amp that's regarded as the better option?

Have a look at my own coax cable before experimenting with anything else.

My only approved source for the LM4562NA is:
http://myworld.ebay.co.uk/yp53/
The seller has a TC-7520 and checks his stock of LM4562NA for best performance in each batch he gets. A few people have bought this IC from Hong Kong and the likes and they turned out to be noisy, fakes, or faulty. So be careful with your source.

Stan

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