Mod your Beresford 7520

[Codifus]

Fantastic cheers Stan. I got my 7520 second hand of this forum and it came supplied with several op amps for me to try including LM4562.

Butuz

Does your 7520 have the very 1st power supply or the one labelled Beresford.me? I was one of the very 1st owners of the 7520 and I was upgraded to the Beresford.me PSU. Improvements were significant.

If you have that original PSU (not labelled Beresford.me) then you *MUST* upgrade

CD

[trailer]

Can somebody suggest me which one I should go for?
I prefer to purchase on ebay, but any other reputable place on the net is fine.

Thank you

Rob

http://markgrantcables.co.uk/shop/in...roducts_id=111

Another option.

[Butuz]

Does your 7520 have the very 1st power supply or the one labelled Beresford.me? I was one of the very 1st owners of the 7520 and I was upgraded to the Beresford.me PSU. Improvements were significant.

If you have that original PSU (not labelled Beresford.me) then you *MUST* upgrade

CD

Hi There. The one I have is the Beresford.me 12v 1.5a.

Butuz

[Butuz]

Just took the 49720HA metal can out and put 4562NA in and I think I prefer it!

Butuz

[Codifus]

Hi There. The one I have is the Beresford.me 12v 1.5a.

Butuz

So you have the one I upgraded too. You're in good shape. I just orderd the Caiman PSU so we'll see how that goes.

CD

[Codifus]

Just took the 49720HA metal can out and put 4562NA in and I think I prefer it!

Butuz

You know that the 49720HA is supposed to be a refined LM4562NA?
Also, when swapping opamps you really need to let the system settle in. Constantly playing music for 3 weeks, yes, 3 weeks minimum, for starters.

I've put the LM4562NAs back into my system twice, and this is what I observed;

initial 1st week observation: clear but very 2 dimensional.
2nd week: systems loses clarity, sounds get somewhat muffled as if someone put a thick curtain in front of the soundstage.

3rd week: Revelation It's as if the LM4562s have finally gotten in sync with the 7520 circuit board. Music is clear, coherent, and 3 dimensional.

CD

[RoboCopper]

Hi to all good people on this forum.
I just got LM4562NA 3 days ago, and it sound beautiful, open, natural, with tighter bass and lively sound. Now I must burn in together with 7520.
Cant wait for it as well as to try even better more expensive upgrades.
What are other better Op Amps to try with open, sound with clear midrange, clean highs and tight bass where it needs to be rather on lighter not darker side?
Also, is it better to buy power supply (which one) or to build one yourself?
Thanks to all.
Regards
Rob

[Covenant]

Hi to all good people on this forum.
I just got LM4562NA 3 days ago, and it sound beautiful, open, natural, with tighter bass and lively sound. Now I must burn in together with 7520.
Cant wait for it as well as to try even better more expensive upgrades.
What are other better Op Amps to try with open, sound with clear midrange, clean highs and tight bass where it needs to be rather on lighter not darker side?
Also, is it better to buy power supply (which one) or to build one yourself?
Thanks to all.
Regards
Rob

I like the AD826 op-amp which, IMHO, is a better all-rounder than the LM4562. With regard to power supplies I think its not an economic solution to build your own (unless your after the satisfaction). Stans suggestion is probably the best.

[RoboCopper]

Thanks Jerry,
Just a quick question in relation to AD826? Can you shortly describe the sound please?

Other questions:
1. As I am quite happy with LM4562NA, I would like to try THS4032, but where to buy it together with 8pin adapter SOLDERED together (once I tried to solder another chip, but my skills are not professional for that task). Any links would be appreciated, I prefer ebay purchase.
Is this safe "bet" to buy? Is it original? Anybody had any experience from that seller?

2. What is Stan suggestion for power supply, my Beresford has normal PS ( Unifive is written on it)

Regards

[StanleyB]

2. What is Stan suggestion for power supply, my Beresford has normal PS ( Unifive is written on it)

My power supply is excellent, which is why I include it with the DAC .
Of course, that doesn't mean that you can't try out other power supplies. I have customers using solar cells with a regulator and rechargeable batteries, or 12V car batteries, or CB radio linear power supplies, etc. My own latest experiment is with Maxwell super caps batteries.