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Beresford TC7520 opamp rolling!! - Page 4

post #46 of 63
It would be nice if somebody with a little spare time and know how would take a shot at trying transformers instead of opamps in the output stage of the Beresford. There are a lot of people, including myself, who have gotten excellent results with this type of mod on inexpensive Cirrus(CS4397-8) based boards. Vintage 1:1 ratio(500-600ohm) transformers can be a bit pricey but decent new ones are available for as little as ten bucks.
I was tempted to take a stab at my old 7510 but it's only being used with a STB plus I already have two other modded Cirrus DACs so it would be rather pointless.
post #47 of 63
Thread Starter 
i finally decided and did the MLC5 / MLC6 mod to my Beresford. i figured i will be having the LM4562NA in the line out anyway. it's quite easy, i just snipped off the legs with a wire cutter. if anyone is interested here's a link: Collection of mods for Beresford TC-7520 - The Art of Sound Forum

it seems to sound a bit smoother after the mod. i had 2 LM4562NA's in, then i switched one of them out from the headphone out for a THS4032CD.
post #48 of 63
anyone out there still using the Beresford TC-7520? I just got one used on the forums because it's the only budget DAC I could find that has line outs, and preamp out for my mackies. It sounds fantastic so far, so much better than the mac pro out!

It is so detailed it's crazy. I feel the preamp output has a bit too much upper treble for my taste, and not quite enough bass. But the treble is completely organic sounding and smooth, so it's not really an issue. The mackies sound so transparent now, it's amazing.

So I just ordered a pair of LM4562NA on ebay. Any other opamps I should look into?
post #49 of 63
Thread Starter 
try the THS4032CD kit from Tirna. i think it costs $15/each if i remember correctly. you might want to get two. you could also try the mods on the art of sound forums. i snipped off the yellow caps on mine when i had it, but didn't really notice a difference though.
post #50 of 63
I'll look into that, thanks. So Semi, it looks like you've moved on from the Beresford? Or do you just not have it in your profile?
post #51 of 63
Thread Starter 
I did move on. Not that the 7520 is a bad unit, but because the gear I have now is more practical for my needs. I still think it's a great little unit though for the price and has potential to be a lot better. When I buy gear, I usually look for value in performance/price ratio and how efficient something can perform. The Beresford definitely falls into that category. Other than opamp swapping, I think if you could build your own separate PSU for it, it could perform much better.
post #52 of 63
hmmm I'm not going to be doing that myself, but it would be something to keep in mind for later on.

Did you, or have you heard of anyone talking about an opamp that was particularly good for the preamp ouput? My SOHA sounds better than the built in headamp, so I'm pretty much just using it for the DAC, and preamp.
post #53 of 63
I think the recommendations stay pretty much the same... THS4032CD and LM4562NA/49720LME are both good choices. Only difference is you don't have to buy another opamp for the headphone section.
post #54 of 63
You guys know where I can find the THS4032 these days? Doesn't seem to be on ebay anymore, and Tirna Electronics doesn't sell them anymore. I sent them an email asking about it.

I just bid for a pair of LM4562, 7 bucks.
post #55 of 63
I would accept the LM4562NA... I heard an analogy on the artofsound forum that worked quite well for me- the stock opamps are a toyota or something similar, LM4562NA are like a BMW sports car, and the THS4032 is like a Ferrari. For almost all applications, the 4562NA is the choice, but when you need every last bit of detail and clarity, and are willing to sacrifice some comfort, the 4032 is a good choice.
post #56 of 63
Thread Starter 
be careful of buying LM4562NA on ebay. i got scammed once, they sent me a bad pair and wouldn't send a replacement.

you could get "samples" from National, just pay shipping. they are a more trustworthy source.
post #57 of 63
well I accidentally bought 2 pairs from different sellers so hopefully one will be good.

Meanwhile, this is what Tirna electronics sent me about the THS4032 in the Beresford, pretty interesting

Quote:
Thanks for the enquiry. We discovered a possible instability with the THS4032s in the Beresford application. Some are stable and excellent while others produce distortion which can be severe. Until we have had time to investigate this & find a solution to it, we are not selling the THS4032a on our adaptors. Sending anything to the USA is not a problem for us. In the meantime we recommend the LM4562NA as a possible alternative upgrade. We sell them through our eBay shop "Tirna_electronics". They are a plug-in replacement for the standard part.

Regards
Jimmy Dripps
Tirna Electronics Ltd
post #58 of 63
SemiAudiophile I am sorry to hijack your thread.
I don't know how you get away with without being bombed with negative comments about Beresford.
Whenever myself or other posters mention Beresford, particularly in the Audio-GD FUN review thread a war starts!
post #59 of 63
Quote:
Originally Posted by rhythmdevils View Post
well I accidentally bought 2 pairs from different sellers so hopefully one will be good.

Meanwhile, this is what Tirna electronics sent me about the THS4032 in the Beresford, pretty interesting
Yep, a few people with the 4032 reported distortion... something about the chip being too fast if I recall correctly.
post #60 of 63
Thread Starter 
Quote:
Originally Posted by rosgr63 View Post
SemiAudiophile I am sorry to hijack your thread.
I don't know how you get away with without being bombed with negative comments about Beresford.
Whenever myself or other posters mention Beresford, particularly in the Audio-GD FUN review thread a war starts!
lol trust me i've been bombarded before. but, since this is my own thread specifically for opamp rolling, i guess people seemed to have cooled off on the negative beresford topic.
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