Mod your Beresford 7520

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26-04-2009, 18:16
Covenant

Quote:

Originally Posted by Dougr33

I'm dismayed to see no one coming to the defense of the 4032 as I'm awaiting my replacement (to fit in case) set to be delivered this next week. I thought they were considered the best so far, and not too strident/wild with some material. I'm very much enjoying the 4562s right now.

Any new appraisals of the 4032s from others who'd sung their praise???

The 4032 is better in my system than the 4562 which I found a little bass heavy. Having said that I think the extremities of frequency response has increased over the past week so that there is little to choose between them other than the 4032 seeming to be more in control of bass response. Why this occurs I do not know :scratch:. An op-amp is not a capacitor so there is no chemical process involved.
I dont feel the need to try more op-amps but if a new one popped up that was liked I would try it.
Now IIRC Stan mentioned other tweaks.........
26-04-2009, 18:20
mwahahaha

Quote:

Originally Posted by Dougr33

I'm dismayed to see no one coming to the defense of the 4032 as I'm awaiting my replacement (to fit in case) set to be delivered this next week. I thought they were considered the best so far, and not too strident/wild with some material. I'm very much enjoying the 4562s right now.

Any new appraisals of the 4032s from others who'd sung their praise???

I still think the 4032's are brilliant and have had the lid off my 7520 for a few weeks as a result. Do you know if Tirna have got a working solution yet for the lid clearance we've had?

I don't want to send mine back though as I don't want to go back to the others for a few weeks while the new one comes through:doh:
26-04-2009, 18:24
Quietschbox

Quote:

Originally Posted by Dougr33

I'm dismayed to see no one coming to the defense of the 4032 as I'm awaiting my replacement (to fit in case) set to be delivered this next week. I thought they were considered the best so far, and not too strident/wild with some material. I'm very much enjoying the 4562s right now.
Any new appraisals of the 4032s from others who'd sung their praise???

Well, i don't know... browsing pages along the 4032 and 4562...

"Ad8620 Vs. THS4032"
http://www.diyaudio.com/forums/showt...postid=1658008

"In my Twistedpear COD DAC, at the balance to single conversion position after the AD826 IV, I have tried both AD8620 and THS4032, also LM4562, AD8066, LM6172, OPA2132 and OPA2064 etc.
*For pop/jazz/vocal music, I prefer THS4032 - a lot.*
The difference between THS4032 and other amp in this case is day and night. It sounds a lot fuller, more importantly, it has much better pace than other amp. It is simply more musical. It tips towards the lower end. But that is what I am looking for. Comparing to the Twistedpear Buffalo, the COD in on the thin side.
You have to try out THS4032."

Something for you?

This thread also says:
http://www.diyaudio.com/forums/showt...01#post1156001
"Have you checked the data sheet for the THS4032 compared to the older NJM4580?
It says the OP-amp (THS4032) cant drive a capacitive load unless it is smaller than 20pF. Check all outputs (pin 1 and pin7) to see if there is a proper protection resistor for to avoid oscillations and unstable operations. If there is capacitors connected right on the outputs it could be necessary to apply a series resistor from the output (20-75 ohm maximum). But Im not sure about the solution due to I dont have any schematics for the SRC2496 to look at and you havnt verified the oscillation on a scope?
Due to the high bandwith, this circuit operates in class-A and because of that it will be running pretty hot (ca 0.5W heat dissipating for each IC) but could of course run to hot if oscillate."

and

http://www.diyaudio.com/forums/showt...28#post1156028
"Oscillating op-amps distort the sound badly, and that's what you are enjoying and calling "SOOO OOOOOPEN", distorted sound. Most pre-amp mods are actually based in making some stage oscillate by accident, but don't say it too loud or some people may become upset... (Anyway, the kind of people that does this stuff neither have an oscilloscope to check nor care about stability at all)."

and

http://www.diyaudio.com/forums/showt...38#post1156238
"You can't use the THS4032 for most audio applications because IT'S NOT UNITY-GAIN STABLE, and most audio circuits require that condition. This op-amp is only stable for gains of 2 or higher, as it's intended for video buffering applications. There is no simple way to make it unity-gain stable.

Also, you can't use the THS4032 with +/-15V in a PCB designed for conventional op-amps because it requires specific layout considerations in order to handle those 0.45W of idle dissipation. Furthermore, most PCB layouts designed for conventional audio op-amps just can't handle the 100Mhz bandwidth."

and

"first thing you should do if wanting to mod circuits should be to purchase a decent oscilloscope for a couple of bucks. Analog instrument are nearly for free now a days and that will be your first choice measuring instrument to use if your intention is to modify circuits. Also, you will learn a lot when using such an instrument and also, its very very useful for all electronic developments, error measurements, modifications and services on broken/faulty equipments.
Otherwise all your future works with modifications will newer be verified only estimated by a guessing.
It will do with a scope in the range of 50 to 100 MHz, (best=100MHz) but you dont need a 2 channel scope, but its very convenient to be able to see what is coming in and what is coming out at the same time when measuring."

Not that i understand enough of it, but warnings about how to implement this thing, would like to get the hang of whats that all about...

http://www.diyaudio.com/forums/showt...35#post1659635
"I got THS4032 and THS4031.
they sounds good.
extended highs , full mids , well controlled and punchy lows.
The only thing I am not satisfied with is that sound stage is a bit narrow compared with traditional Audio OPAMP."

So many opinions on things. I once decided electronics is too much mathematics for me, so i stopped at basic level. Every once and then,
things like these make me wish i knew more and had some gear.
26-04-2009, 18:54
Covenant

Quote:

Originally Posted by mwahahaha

I still think the 4032's are brilliant and have had the lid off my 7520 for a few weeks as a result. Do you know if Tirna have got a working solution yet for the lid clearance we've had?

I don't want to send mine back though as I don't want to go back to the others for a few weeks while the new one comes through:doh:

Yes-I have had the lid on my 7520 for a week.
26-04-2009, 18:57
mwahahaha

Quote:

Originally Posted by Covenant

Yes-I have had the lid on my 7520 for a week.

Excellent! Now to find a window when I'm not at home to get mine sent off:)
26-04-2009, 20:15
Gazjam

4032s are better than the 4562s in my system by an appreciable ammount.
Sound more cohesive with all elements of the soundstage given equal clarity (and then some), not with emphasis on the vocals like I found the 4562s to have.

Don't get me wrong, over the stock amps they are both so much better, but the 4032 does what the 4562 does, only more of it and better.

Regarding measurements vs percieved sound quality?
Who cares?
If it sounds better, it IS better, musical involvement isn't about datasheet specs, it's something "between the lines" that you can't really quantify.

I don know about measurements from a hole in the ground, just go by my ears.

My €0.02 worth...
26-04-2009, 20:22
Krisbee

1 Attachment(s)

This is a hole in the ground, don't want you having any accidents Gary. :)
26-04-2009, 21:30
Quietschbox

Quote:

Originally Posted by Gazjam

Regarding measurements vs percieved sound quality?
Who cares?
If it sounds better, it IS better, musical involvement isn't about datasheet specs, it's something "between the lines" that you can't really quantify.

I don know about measurements from a hole in the ground, just go by my ears.

My €0.02 worth...

"Good" or "better" can be, not always is, quite subjective, personal, misleading.
As well as blindly believing in science and scientists.
26-04-2009, 22:42
leo

Measurements for stability are important IMO, any op-amp with even mild HF ringing is not going to sound identical to any op-amp which is dead stable in the same circuit

Of course this is not suggesting all op-amps which measure stable do sound the same, because they don't.
27-04-2009, 00:12
ReachtheSky

Quote:

Originally Posted by jon1

Still waiting for four bmw m5...singels..And they say there is a credit crunch on:eyebrows:

jon

Hi Jon
Where are you planning to use the four M5 singles? Are you modding the 7520 to output separate channels?
Granville

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