Mod your Beresford 7520

[sponge]

The ebay seller is Vintage Audio Lab, i think he does the Valab NOS Dac, he is called Kevin i believe. That said it is very cheap, but he seemed genuine. I'd hate sending it back to China and then chasing a refund....painful indeed.

One of the guys I know who was scammed didn't get his money back - Not nice! He knew as soon as he received the chips they were fakes - The markings were all wrong - They did work though, which makes it worse if anything.

Anyway, good luck if you go ahead.

Cheers - Ken

[leo]

A repair job I once did was on an amp which went into DC protection after about an hours use.
Cut a long story short I traced it down to a pair of single op-amps used in the servo, they was supposed to be opa604, the printing didn't even look right on close inspection so was possible fakes (god knows why anybody would want to make fakes of these) they also measured extremely noisy .
Anyway replacing with a new pair of proper ones cured the problem

BTW, theres the opa827 now which is supposed to be an improved version of the 627, theres also a bipolar input version opa211

[TeTsuo36]

A repair job I once did was on an amp which went into DC protection after about an hours use.
Cut a long story short I traced it down to a pair of single op-amps used in the servo, they was supposed to be opa604, the printing didn't even look right on close inspection so was possible fakes (god knows why anybody would want to make fakes of these) they also measured extremely noisy .
Anyway replacing with a new pair of proper ones cured the problem

BTW, theres the opa827 now which is supposed to be an improved version of the 627, theres also a bipolar input version opa211

320368973254 ebay item no.

This is a UK seller, good feedback (100%, 589), he has 3 left. Less of a risk than from 1/2 way around the world. He added a comment at 20:29 regarding the product being genuine. I took a punt anyway, mmmm not even bought the 7520 yet. Fool.

[apmusson]

320368973254 ebay item no.

This is a UK seller, good feedback (100%, 589), he has 3 left. Less of a risk than from 1/2 way around the world. He added a comment at 20:29 regarding the product being genuine. I took a punt anyway, mmmm not even bought the 7520 yet. Fool.

The comment was as a result of my query. I am looking forward to trying the 627, but am not sure how they can better the ths4032 in my system. Problem I have is that Its addictive this opamp swapping....

Ade

[trailer]

Trailer, How's the Wolfson WM8716 transplant coming along? Have you got the box back yet?

I'm out of the country at the moment until next week or so.

Will report back as and when.

[StanleyB]

My own WM8716/LM4562NA modded version is just something else. I have been testing mine for a few weeks now against a standard TC-7520, and on complex material the separation is far better.
If I can get my hands on a small quantity of the WM8716 without having to buy the 1K minimum quantity I might do a limited run of a SE version if there is enough interest. But keep in mind that it could cost an extra £30 to £50. The chips would have to be inserted by hand on the PCB since it would require far too much to reprogram the automatic pick-and-place machine to do a limited run.

Stan

[Covenant]

Is this the upgrade you are looking into for those of us who already have a 7520?

[StanleyB]

Nope. This is a completely separate product. It's not an upgrade of any sorts and I don't intend to make more than 50 or so and share them between myself and my handful of distributors around the globe. But it is early days yet. Before anything comes off we are looking at a few months of preparations etc.

STan

[Covenant]

How are you going to distribute that number fairly?
Me first by the way.

[apmusson]

Stan

I'll have one from you too.

Ade