Mod your Beresford 7520

I've just noticed that due to the 47920's being taller than the original opamps, they may slightly touch the inside of the lid when I replace it. Is this bad?
If it's bad all put a strip of insulating tape under the lid. If it doesn't matter, I may put a blob of heatsink paste on top of each one to help them dissipate heat through the case.

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Originally Posted by trailer

Aye I went from the 4562s to the 47920s so the night and day wasn't there as going from the 4562s from the standards. I'm looking forward to seeing how the 4032s sound in comparison though.

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I've ordered the 4562s and the 4032s. I will get them both in time for the weekend. Which ones should I start with? Stan mentions using both types (one in each IC socket). I might do the same - use the 4032 for the headamp and the 4562 for the static line out circuit and route that through my Graham Slee Solo Headamp.

What do you think?

Ade

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Originally Posted by HighFidelityGuy

I've had my 47920's installed for about an hour now with the DAC playing through my amp and my headphones to run both opamps in and they are only slightly warm to the touch. Perhaps this is something to do with the impedance of your headphones if they're quite high or low or something? :confused: I don't know much about driving headphones as I prefer not to use them.

On the subject of the 47920's, I'm liking the sound so far. I've not noticed a massive difference yet but I think that's because my speakers aren't good enough to make a critical comparison. I should be getting some new ones soon though.

I have noticed a little more detail overall and more punch to the bass.

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Oh god now you've got me worried! Might check them again after I get home tonight see how they are:confused:

I don't use headphones so that doesn't explain it? Maybe I damaged the opamp whilst installing it and that has resulted in the heat? I'll compare them both when I get home.

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Originally Posted by mwahahaha

Oh god now you've got me worried! Might check them again after I get home tonight see how they are:confused:

I don't use headphones so that doesn't explain it? Maybe I damaged the opamp whilst installing it and that has resulted in the heat? I'll compare them both when I get home.

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Personally, I'd try swapping the opamps around - ie. the one in socket 1 swap with the one in socket 2 and vica-versa and see if the problem moves with the opamp. If it does then check there isn't a short circuit to the can with one or more of the legs. If that's clear, pop the original 5532 in the hot opamp socket and observe again.

Ken

Hmm, according to Stan the opamp an the right is for the headphone output, so something doesn't seem right. Saying that, the one on the right is slightly warmer than the one on the left in mine but then I have headphones connected. I'd definitely do what Ken said to be on the safe side.

Just got home and whipped the lid off and all was well. I reseated the hot amp before I went out and maybe I hadn't got it in 100% correctly. Anyway just rolling a few tunes through the dac and will unplug everything and have another check before I go to bed.

I don't use the headphone amp anyway (Yet!) so only really need the one anyway if one is damaged.

OK well after a few mins of tunes the headphone amp opamp is very hot again.

I've taken it out and put one of the original ones back in just as a control.

The main opamp is fine though so perhaps I have a dud? I'll see how the original fares after 10 mins or so.

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Originally Posted by Gazjam

with the LM4562NA I found an obvious and immediate difference.

As in different sound signature kind of difference.

As time went on it became better and better (and more different from the original sound)


Agree that a sticky about best Op Amp to use, various mods would be good. Perhaps even a Poll or two?

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Best £10 you have spent Gaz?

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Originally Posted by Covenant

Best £10 you have spent Gaz?

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Just installed my 4562s. My first listen (20 minutes - quick test) left me with a smile on my face. The 4562s seem to create a more 'solid' sound (drums had more depth) and also an improvement in separation. I shall carry on testing them for a few days and then try the 4032s on the heapamp circuit.

Big improvement for £10 imho.

Ade

Once the original opamps are replaced for the LM4562 or THS4032, the TC-7520 ends up having one of the best non-discrete output stages in a DAC out there.