Mod your Beresford 7520

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Originally Posted by Covenant

Could you swap back the old op-amps just to make sure its not something else?

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Yep, tried that already - Problem goes away with the original 5532's.

Just noticed something else - When the Squeezebox changes tracks, I hear a slight "click" in the phones - This didn't happen with the 5532's.

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Originally Posted by HighFidelityGuy

Thanks for the update.

I've just been comparing the THS4032 with the original NE5532 and I noticed that the NE5532 needs up to +/- 22V while the THS4032 only needs up to +/- 16V. I don't know if this has anything to do with it. I guess it depends on what voltage the 7520 is giving the chip. I guess Stan is the best person to answer this. Any idea what's causing this Stan?

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Those voltages are the maximum - The minimum working voltage is considerably less - 10V (+/- 5V) for the THS4032 for example.

Ken

Well I've had the LM49720's in for a day now. Took a bit to get them running I think. More so than the 4562's and I suspect they might not be fully ran in yet.

Compared to the 4562's they are more revealing of the recording. More clinical I would say. Some recordings I think "much better", then others are a bit "erm, OK". Like I said I think this might be due to the revealing nature of the 49720's and the quality (or lack of) of the recording.

I'm going to persevere. (And I might get some 4032's :cool: )

Some people on the web like the LME49860 very much so i had a look at the catalog of National.

http://www.national.com/cat/index.cgi?i=i//305

I wonder if the specs. of this opamp make it possible to use in the 7520.
Can anybody comment on this opamp?

Oke i've found the answer, i read they have the same quality specs as the the LM4562! Just higher voltage loads.

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Originally Posted by rhmjmango

Some people on the web like the LME49860 very much so i had a look at the catalog of National.

http://www.national.com/cat/index.cgi?i=i//305

I wonder if the specs. of this opamp make it possible to use in the 7520.
Can anybody comment on this opamp?

Oke i've found the answer, i read they have the same quality specs as the the LM4562! Just higher voltage loads.

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It appears to be pin compatible so I think it should work. The LME49860NA version would be the one to go for as it's the right package type.

Farnell sell it HERE

The specs seem almost the same as the LM4562 and the LME49720 but the LME49860 has a higher max voltage rating.

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Originally Posted by Stratmangler

I am more than pleased with the results though - music just "sounds right".
Music sounded good before the mods, but the whole mod21 thing has lifted my 7510 up into a different league.

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I should have learned by now to keep my mouth shut by now - I keep on forgetting (sign of stupidity, maybe ?) - but I keep getting caught out by the running in period required by components.

I've had the 7510 with the recently done Mod21 stage2 upgrades running for 48 hours or so, and the sound has gone from brilliant to ok, defined to grungy, generally great to good to passable to poor, and back again, sometimes within the space of an hour.

As I am typing things sound fantastic, but I am expecting a change for the worst before things eventually stablise and bed in.

Here's hoping for stabilisation sooner, rather than later:cool:

Chris:)

Just a little confused from trying to combine all the info on the THS4032's - in order to use these you need an adaptor board but do you also have to solder in an additional cap?

Cheers
Dan

I have noticed clicks and pops on various tracks with the LM4562's (MP3's) With lossless files I dont have any problems. I think any anomalies on tracks might be due to them being bad recordings and the LM4562's ability to dig up alot of detail.

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Originally Posted by mwahahaha

Just a little confused from trying to combine all the info on the THS4032's - in order to use these you need an adaptor board but do you also have to solder in an additional cap?

Cheers
Dan

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Aye.

Cheers Trailer much appreciated.

Think I might start with giving some LM4562's a go and see how I get on from there:)

Cheers
Dan