Collection of mods for Beresford TC-7520

[StanleyB]

Need to change my spelling Stan.

Forgot to mention that you can abort. A solution hs been found.

STan

[StanleyB]

Stan,
So does it work underwater, then?

It has been making waves before even surfacing yet.

Stan

[Gazjam]

Forgot to mention that you can abort. A solution hs been found.

STan

oh, ok then Stan.

Look fwd to seeing it!

[StanleyB]

Look fwd to seeing it!

You'll have to save up if you want to hear it as well. I reckon that with its limited production run and ground breaking performance it is going to become a collector's item.

STan

[Gazjam]

I bet it will be more than worth it though, based on how good the 7520 sounds


Gary.

[Codifus]

Hello all,

I'm relatively new here and I've had my TC-7520 (and upgraded PSU) for a couple of weeks now. With the original opamps in my system (I use the Line-out side only, no headphones) the 7520 sounded quite good. The midrange was slightly un-involving, but still enjoyable.

I did the LM4562NA upgrade with MLC5/MLC6 caps removed and after a week found the upgrade to be nearly perfect. The system now really sounded good.

Here's the thing though, as has been suggested in this thread and others, the LM4562NA upgrade with MLC5/MLC6 caps removed does reduce the bass a wee bit in the lower registers, 40 Hz to 30 Hz. My speakers have dual 8" woofers and a bass port, and I like my bass. The system still sounds very very good but I know that I had better bass. The original opamps had a stronger bottom end.

I swear if the LM4562 upgrade had the right bass I would be done with finding the right opamp. From 100 Hz upwards that LM4562NA upgrade with MLC5/MLC6 caps absolutely shines.

Now that MLC5/MLC6 caps are removed in my 7520, I'd like to find other opamps to try to get my bass back. I am soldering challenged and the idea of putting those caps back.....well, let's not go there

Would it be a good idea to start another thread dedicated to 7520 mods with the caps removed?

I wanted to try the tirna 4032 mod, but that chip specifies that it doesn't have unity gain and therefore is not best suited to audio.That information makes me reluctant to try it despite all the glowing praise. Also, it seems to be suggested that now that I have the ML5/ML6 mod, the tirna chip is now not recommended.

I wonder do the metal can LM4562s make up for the lacking bass perhaps? I'm a bit confused also, is the LME49720 the same as the LM4562NA with just the metal can difference?

Here's a listing on ebay I'd like to try if I could get the advice on how to proceed;

http://cgi.ebay.com/LME49720-LM4562-...3%3A1|294%3A50


Thanks

CD

[StanleyB]

The combination I use on one of my boards is THS4032 for line output and LM43562NA for headphones. It gives more low end grunt compared to using 2X of the LM4562NA.

[Gazjam]

*Edited for relevance*

I put the 4032's Op Amps in after using 4562's and I can conform the 4032's dont work really well with the ML5/6 caps removed - the treble is quite harsh and a bit fatiguing. Possibly unstable?
I believe this has been confirmed by another Forum member testing this configuration on a scope.

[trailer]

No disrespect lads but this isn't this meant to be a sticky for a DIY mod guide?

[Gazjam]

None taken.
Your right.