Mod your Beresford 7520

[RoboCopper]

I have/had a TC-7520 which is now in turmoil from my unending mod adventure. Looks like I cooked my DAC. I am ordering some replacement boards from Stan along with a Caiman hopefully today.

But up to the point of the TC-7520's current status:

1) DAC upgrade is by far the biggest improvement
2) Power regulators come in next

Everything else is subtle, caps etc. If I could do it all over again, I may have just stopped at the DAC change. It was so substantial for replacing a $6.00 chip, it was utterly amazing!

Great to hear it,
Can you describe what is the difference in sound?

Also, where can I order this DAC?
As well as power regulators?

This looks like next upgrade

thanks

[fmzip]

Great to hear it,
Can you describe what is the difference in sound?

Also, where can I order this DAC?
As well as power regulators?

This looks like next upgrade

thanks

The Wolfson DAC is stock at Newark
http://www.newark.com/wolfson-microe...741?Ntt=wm8716

The power regulators are stock at Digikey

http://search.digikey.com/scripts/Dk...ds=7805+murata
http://search.digikey.com/scripts/Dk...eywords=7812sr

You will need a new power supply for your 7520 once you change the regulators. You can order the Caiman power supply or get yourself a linear power supply as I did.

[AndrewR]

Hi Butuz,

Just received and plugged in the Tirna-modded Beresford. First impressions are very positive. A more up-front sound (in terms of the soundstage), improved get-up-and-go, faster leading and trailing edges along with an increase in inner detail.

Also it sounds like there is more to come when properly warmed up. I'm probably going to get a nice surprise when I get home from work.

Andrew

Hi all,

The above still stands, but later listening confirmed some issues I have with my Caiman PSU. Bass seemed restricted and the tune seemed flat (just as it was when I briefly tried it with the original TC-7520) - so I swapped back to my 7520 supply and wow! Bass and tune returned with vengeance.

While I fully understand that the 7520 supply's 12V voltage is probably too low or borderline for the MuRata regulators - the difference is astounding.

Would appreciate some advice here [please ]. Might consider trying a linear supply, like here.

Andrew

P.S. I am really loving the Tirna mods - the DAC is even juicier, detailed and involving. ...100%

[StanleyB]

If you have a lack of bass with the Caiman PSU after the mods, then you need a more bassy opamp. The AD826 or THS4032CD would be a good starting point.

[AndrewR]

If you have a lack of bass with the Caiman PSU after the mods, then you need a more bassy opamp. The AD826 or THS4032CD would be a good starting point.

Hi Stanley,

I'm using an OP2132PA, which has a very fruity and solid bass (how I like it) without getting in the way of what the rest of the music is doing - and the 7520 supply is preserving that characteristic. I think I drew the short straw with this particular Caiman supply.

Oh My Gosh - right now am listening to Infected Mushroom's Viscious Delicious and it is sounding even more evil!!! (for Clive's benefit, 53% more evil ) Well done Stanley and Jimmy!

Andrew

[Codifus]

Hi all,

The above still stands, but later listening confirmed some issues I have with my Caiman PSU. Bass seemed restricted and the tune seemed flat (just as it was when I briefly tried it with the original TC-7520) - so I swapped back to my 7520 supply and wow! Bass and tune returned with vengeance.

While I fully understand that the 7520 supply's 12V voltage is probably too low or borderline for the MuRata regulators - the difference is astounding.

Would appreciate some advice here [please ]. Might consider trying a linear supply, like here.

Andrew

P.S. I am really loving the Tirna mods - the DAC is even juicier, detailed and involving. ...100%

This is exactly what I experienced with the Caiman PSU added to my 7520, and I have the original regulators. Swapping back to my 7520 PSU brought my 7520 back to life.

CD

[fmzip]

If you have a lack of bass with the Caiman PSU after the mods, then you need a more bassy opamp. The AD826 or THS4032CD would be a good starting point.

I second the AD826......definitely a richer fuller sound with this op amp.

Also, those caps need some time to settle it. Leave the unit on for a week straight and you will be pleasantly surprised at how warm the sound becomes!

[RoboCopper]

The Wolfson DAC is stock at Newark
http://www.newark.com/wolfson-microe...741?Ntt=wm8716

The power regulators are stock at Digikey

http://search.digikey.com/scripts/Dk...ds=7805+murata
http://search.digikey.com/scripts/Dk...eywords=7812sr

You will need a new power supply for your 7520 once you change the regulators. You can order the Caiman power supply or get yourself a linear power supply as I did.

Cheers for this,
Do I need both power regulators or any one of those listed?
Also, what linear power supply did you get or you built one yourself?
Cheers

[StanleyB]

You need both. Also remove the 10 ohms/1W resistor behind the 5V reg and replace it with a wire link if you are using the Murata 5V reg.

[fmzip]

Cheers for this,
Do I need both power regulators or any one of those listed?
Also, what linear power supply did you get or you built one yourself?
Cheers

I find one of these used for $30

http://cgi.ebay.com/MASTECH-VARIABLE...item588846aea5