Anyone finished burning in their TC-7520 yet?

**sponge** · 19-03-2009, 19:43

Thanks Leo - I have some 2132's - I'll give them a try.
Would you prefer the THS4032 over the LM4562? - I assume they are stable in the TC-7520 as Stan has already commented on it. They are both more or less the same price (except for the adapter) but I don't want to fork out for a couple of chips unnecessarily.

Ken

**leo** · 19-03-2009, 19:54

Originally Posted by sponge

Thanks Leo - I have some 2132's - I'll give them a try.
Would you prefer the THS4032 over the LM4562? - I assume they are stable in the TC-7520 as Stan has already commented on it. They are both more or less the same price (except for the adapter) but I don't want to fork out for a couple of chips unnecessarily.

Ken

Yes, give the OPA's a try, its easy to revert back if you don't like it

I don't have a TC-7520 so can't comment how the 4032's are in it I'm afraid.
I personally like the THS4032 better than LM4562 in other circuits I've used them in, it also drives capacitive loads far better.
If Stan says the THS4032 works ok in his dac you should be fine, only niggle is having to use a socket for converting SOIC to DIP, my advice if you decide to try it is remove the ceramic decoupling cap from the pcb and solder across pin4 and 8 of the converter socket as close to the THS4032 pins as possible

**leo** · 19-03-2009, 19:57

Not meaning to stir up but the metal can LM4562 betters the plastic DIP8 version LM4562, I've compared them and the metal can sounds noticeably better to my ears, the real stinker is that they are far more expensive

**Covenant** · 19-03-2009, 20:09

Oh my God-what have I got myself into? Whats the best one that will fit in the case?:

**leo** · 19-03-2009, 20:46

Originally Posted by Covenant

Oh my God-what have I got myself into? Whats the best one that will fit in the case?:

I'm sure you'll have fun

**Covenant** · 19-03-2009, 21:32

Well I will have a go with the 4562 and see what I think.
The 49720HA are about £12 each and are 9mm diameter and 4.5mm high with 13mm legs. I suppose the legs would need to be snipped of to suit and then soldered in.

**StanleyB** · 20-03-2009, 07:27

My 'regular' TC-7520 uses a set of NE5532FE. But the FE is as rare as hen's teeth. I haven't seen them for sale for some years now.

I would think that for the average punter the LM4562NA would be more than sufficient. Some of the opamp choices require extreme decoupling attention. Some of them are also quite costly.

STan

**Covenant** · 20-03-2009, 07:34

Thanks Stan,
If you come across others you think may be worth trying please let us know.
That goes for all you diy experts too!

**sponge** · 20-03-2009, 08:09

You are quite correct Stan - The metal can LM4562 as mentioned by Leo is 20 GBP (+VAT) at the moment from Farnell - Not for the faint of heart.

I have previously tried the 49710 (single) in a PPA headphone amplifier, but it sounded a little restrained to my ears with Senn HD600's.
I'll try the OPA2132's today and I think I may place an order for a couple of THS4032's.

BTW Stan, where are the ceramic caps located that Leo mentioned, or could I get away without getting the iron out?

Cheers - Ken

**StanleyB** · 20-03-2009, 09:16

Originally Posted by sponge

BTW Stan, where are the ceramic caps located that Leo mentioned, or could I get away without getting the iron out?

I have put the caps right next to the opamp sockets. I don't know if the opamp sockets would affect the decoupling though. It worked OK on my PCB. I'll see if I can find the one I used. I got so many of them lying about with various mods, so finding the exact one is a challenge...

STan

Thread: Anyone finished burning in their TC-7520 yet?

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