Mod your Beresford 7520

[apmusson]

David,

I let the LME49720HA burn-in for about 30 hours before listening to it in earnest. But it sounded great from the get-go.

My 7520 has had the MLC 5/6 snip done, but no other mods. I am also using the maplin power supply set to 13.5V.

I also have a Caiman DAC from Stan. For quite a while I actually like the 7520 described above better with my headphones (AKGk701 & HD650s) - it had more punch.... however after doing the murata regulator and capacitor swaps (described in the Caiman Mods thread) I have completely changed my opinion and prefer the detail and space of the modded Caiman (with a LME49720HA opamp for the lineout and a THS4032 for the headphone output).

Both DACs are great pieces of kit and I can't speak more highly of Stans support....

Ade

How long did it take for the LME49720HA to burn-in and stabilise in your 7520? Also, did you have the MLC5/6 and the 100nf cap and 36 resistor mod on your 7520 when they were installed?

Thanks

CD

[Robscix]

I prefer the sound of the Dual LME49710HA module to the LME49720HA, trouble is they are too big for just popping in there.

What happens with this MLC 5/6 snip, I located the components and while sone have been cutting them off a few others have been adding different caps and resistors.
any info on that? I have been reading through the various thread....

[Codifus]

I prefer the sound of the Dual LME49710HA module to the LME49720HA, trouble is they are too big for just popping in there.

What happens with this MLC 5/6 snip, I located the components and while sone have been cutting them off a few others have been adding different caps and resistors.
any info on that? I have been reading through the various thread....

My observations of the mods to my 7520 are from my listening through my stereo speakers. With MLC5/6 clipped I found that the bass lightened up significantly, enough so that I absolutely had to do the 100nf and 36K mod. The top end with MLC5/6 clipped, about 300Hz and beyond, was wonderful, however. I have never actually used the headphone jack so I'll leave it to others for the headphone observations.

CD

[Codifus]

David,

I let the LME49720HA burn-in for about 30 hours before listening to it in earnest. But it sounded great from the get-go.

My 7520 has had the MLC 5/6 snip done, but no other mods. I am also using the maplin power supply set to 13.5V.

I also have a Caiman DAC from Stan. For quite a while I actually like the 7520 described above better with my headphones (AKGk701 & HD650s) - it had more punch.... however after doing the murata regulator and capacitor swaps (described in the Caiman Mods thread) I have completely changed my opinion and prefer the detail and space of the modded Caiman (with a LME49720HA opamp for the lineout and a THS4032 for the headphone output).

Both DACs are great pieces of kit and I can't speak more highly of Stans support....

Ade

Thanks for that, Ade. I use my 7520 exclusively through stereo speakers so my environment is quite different from yours. I also heartily agree about Stan's support and this forum's friendliness

CD

[Robscix]

My observations of the mods to my 7520 are from my listening through my stereo speakers. With MLC5/6 clipped I found that the bass lightened up significantly, enough so that I absolutely had to do the 100nf and 36K mod. The top end with MLC5/6 clipped, about 300Hz and beyond, was wonderful, however. I have never actually used the headphone jack so I'll leave it to others for the headphone observations.

CD

I have actually been using both for testing. I have been using headphones when I had to and a Class-D and stereo speakers when allowable.
Perhaps I will investigate the mod but perform it so it can be undone if it is something that does not agree with my current system.
Thanks for the information.
So the 36K and 100nf cap mod are replacments after clipping MLC5/6?

[Codifus]

.......
So the 36K and 100nf cap mod are replacments after clipping MLC5/6?

You would think so

It was more like;

1. The MLC5/6 mod was suggested to open up the LM4562NA and also get get rid what some had observed as 1 note bass with the LM4562NA.
2. Some of us found that bass weakened with that mod. So Leo and Stan suggested the cap and resistor mod later.

Leo is another one on the forum that I am very thankful to encounter. Man does that guy love to tinker! And he publishes the results to our benefit.

My impression of Leo is that he loves to tinker so much that, if someone were to give him a gift of some great sounding audio device, a DAC, amplifier, turntable, etc, but that this device had absolutely no way of being opened up to look inside, it would drive him mad. Am I right, Leo?

CD

[Robscix]

Would you suggest the mod if your not using the LM4562NA?

[Codifus]

Would you suggest the mod if your not using the LM4562NA?

Well, maybe. When I put in the LM4562NA, I immediately clipped the MLC5/6 caps.

After it was clipped I tried a few opamps; LM4562, OPA2132, AD826 LME497290, although with the LME49720 I think I may not have given the opamp enough time to break-in. I bought it off of ebay and decided to return it within the window of opportunity, so to speak. My favorites are the LM4562 and the OPA2132. Both are very different but sound great in their own way. They both lacked bass, however in my setup thru speakers. Headphones I don't know.

Now, the 36K and 100nf mod only applies to the LM4562NA opamp. I don't know what resistor/cap combination would work with the OPA2132. I have read observations on this forum that the 36K and 100nf mod makes the OPA2132 opamp too warm. This is my only DAC and the idea of experimenting to find the right resistor cap/combo for the OPA2132 wasn't my cup of tea. I just want to enjoy my music. If I had another spare DAC I might have explored that idea, but all this waiting for any change to settle in has worn me out.

At this point I am "finessing" the 36k/100nf mod. Perhaps finessing isn't quite the right word because I am soldering challenged and what I've done is nothing compared to adaptations like PSUs, discrete opamps, and regulators that I've seen others do to their 7520 or Caiman. I'll post my observations once the system has settled in.

So, to answer your question, I would rather leave it up to you. I've given you my experience so far so you can decide accordingly.

Thanks

CD

[leo]

My impression of Leo is that he loves to tinker so much that, if someone were to give him a gift of some great sounding audio device, a DAC, amplifier, turntable, etc, but that this device had absolutely no way of being opened up to look inside, it would drive him mad. Am I right, Leo?

CD

No comment

[leo]

Nice thing with a lot of these mods is that they are cheap and easily reversable if you don't personally like the results

I simply removed/desoldered MCL5/6 and soldered in its place a cut up 8pin DIL socket , it allowed quick comparisons with the stock ceramics, 36k/100nf mod, left empty etc