Mod your Beresford 7520

[trailer]

I tried the optical again today. It's still popping but nowhere near as loud as with the 4032.
I'm wondering if it had something to do with the Maplin PSU blow out?

[chrism]

I have a 7510 mod 21 (1 and 2) with the 4032 and a Maplins Linear Bench Supply rated at 13.8v and use a Squeezebox and don't have any popping noises that you have decribed. I use the coaxial input though and have not tried optical.

Regards

Chris

[trailer]

The popping started after either my Maplin PSU blew up or the Wolfson chip was fitted.
The PSU blew up the day I sent the 7520 away for the new chip. After the PSU blew all I did was plug the wall wart PSU in to make sure the 7520 still powered up and didn't give it a listen, so it may well of happened then.

[sponge]

The popping started after either my Maplin PSU blew up or the Wolfson chip was fitted.
The PSU blew up the day I sent the 7520 away for the new chip. After the PSU blew all I did was plug the wall wart PSU in to make sure the 7520 still powered up and didn't give it a listen, so it may well of happened then.

Did the guy who did the Wolfson install not check the 7520 before he did the swap? - Maybe he did but didn't check all the inputs...

[trailer]

That was probably the case. I guess I should have checked it before I sent it too.

By the way, after a couple of days warming up the 49720+Wolfson is sounding bloody marvellous.

[sponge]

By the way, after a couple of days warming up the 49720+Wolfson is sounding bloody marvellous.

That's good to hear - Did you ever try the plastic cased LM4562's? I like them a lot and use them for both Headphone and line-out. Do they still work with the Wolfson DAC?

I think I will order a couple of WM8716's - They are very reasonably priced - And have a good ponder on the updrade. If I decide to go ahead, I may create another thread detailing the work involved in case any members are interested in having a go.

Ken

[trailer]

I think I got mine direct from Wolfson as "samples".

I didn't try the 4562's. At the time that the op-amp rolling recommendations kicked off I think someone, might have been Leo, suggested that the 49720's gave a better performance so I went straight to them.

I would certainly recommend the Wolfson chip. Don't be put off by my popping issues. Stan hasn't got them so I think it's something that's happened uniquely to mine.

[leo]

Metal can version of both 4562 and 49720 is better than their plastic cased brothers, improved thermal properties etc

[leo]

Regarding the popping issue, do you hear these noises on the same songs or is it pretty random?
Is it heard with no music playing?

Does the 7520 use series resistors on the op-amps output ?

[trailer]

Regarding the popping issue, do you hear these noises on the same songs or is it pretty random?
Is it heard with no music playing?

Does the 7520 use series resistors on the op-amps output ?

It only happens when there is music playing (randomly) and only on the optical. It doesn't happen on the co-ax. I've tried different sources on the optical and it's the same. Weird or what?