Mod your Beresford 7520

[marscay]

There is quite a big difference in sound signature when using one or two LT1364 opamps. I had a LM4562 in the line socket and a LT1364 in the headphone socket for a couple of days and i noticed that the high frequencies where dominating on my Grado headphones, very detailed, very forward, very dynamic, but for me too much off everything.
I changed the LM4562 for another LT1364 and the sound signature changed completely. Now the low frequencies dominate much more and make the sound more balanced and less fatique. The bass now is really BIG!
I am waiting for the 4032 chip from Tirna how they stand out to this config.

thanks that's quite interesting, i've got another 1364 i can pop into the headphone socket so i might pop that in before the beers and see if i get the same outcome.

i've given the single 1364 a good 6-7hrs playing time today and some of the forwardness has gone and a bit more bass has developed in the last hour ......was a little bass shy at first compared to the stock opamp (about the only negative) but not much in reality - i could easily live with the 1364 as it stands tbh, definitely lively but not harsh at all for most of my recordings....i think my Arcam amps gell with them nicely.

sounds like the 4032 really stand on top though, mine still aren't with me....but the 1364 is sounding phenomenal, and i can't imagine the 4032 actually improving it lol. - played a wide variety of tunes today Devo (yes Devo rock), Get Well Soon, Hot Chip (sounds unbelievable), INXS, Massive Attack, Black Crowes, Slipknot ....all of it sounds vastly improved and the metal/rock albums have a lot more energy than before.

[Covenant]

So what are the extra caps doing Stan?

[leo]

They look to be soldered to 10k resistors which seem close to op-amp pins 8, Hmm, extra decoupling for the op-amps?

[StanleyB]

When using high current opamps it helps to have some extra energy storage close to the supply pins. Reggae and drum-n-bass lovers would notice the difference.

[ReachtheSky]

[QUOTE=Sensimilia;42020]I have been listening to the WM8716 mod on the TC-7520. When fitted to the TC-7510 the results were so so. But on the TC-7520 with the THS4032 for line output and LM4562NA for headphone output it's going to be hard to beat.
Stan

Hi Stan,
Is this your current optimum setup?
Could you explain your preference or suggestion to use "the THS4032 for line output and LM4562 for headphone output?"
Do you think this is better than using THS4032 in both locations?
Thanks Granville

[StanleyB]

More than one person has asked me about my preference, and in particular about how I use one LM4562 and one THS4032. The simple answer is that I am not hardwired to any particular configuration. I don't have the luxury to listen to the same DAC for too long. Every day brings new challenges and new ideas for me to try out. So I can't say what's best. I can only mention what I enjoy most.

Stan

[HighFidelityGuy]

When using high current opamps it helps to have some extra energy storage close to the supply pins. Reggae and drum-n-bass lovers would notice the difference.

Hmm, very interesting. I can see this suiting me nicely with my love of the bass.
So other than the 100uF electrolytic cap between the resistors, I notice that a couple of the smaller caps (LC5 and LC6) are missing in that picture. Do these need removing to make the mod work properly?

Thanks.

[StanleyB]

I notice that a couple of the smaller caps (LC5 and LC6) are missing in that picture. Do these need removing to make the mod work properly?

No comment.

[HighFidelityGuy]

No comment.

You like to keep us guessing don't you Stan.

Sorry I got the numbers wrong, that should have been MLC5 and MLC6.

Right, so I think the new cap goes between opamp pins 4 and 8. which we already know is for input power decoupling.

The two smaller caps appear to be 100pF and MLC5 appears to be between opamp pins 1 and 2, which are output A and inverting input A respectively.

MLC6 appears to be between opamp pins 6 and 7, which are inverting input B and output B respectively.

So the two smaller caps aren't on power lines so I'm guessing they are unrelated to the new cap but with my lack of electronics knowledge I'm probably wrong.

Would anyone else like to chip in here.

[leo]

Anyone noticed the other mods on my PCB?

Its either my eyes playing tricks on me but it seems a few resistor values in the phones section have been tweaked too