Mod your Beresford 7520

**StanleyB** · 30-03-2009, 21:43

The LM4562NA for the 1st IC and the THS4032 for the 2nd seems a good combination on my rig. I might mod my personal unit with a WM8716 and a few minor tweaks I have had in mind but just can't find the time to try out.

Stan

**Covenant** · 31-03-2009, 07:18

Farnell has a WM8716 on its site but its got 24 pins-not that one surely?

**StanleyB** · 31-03-2009, 08:00

Nope. You need the 28 pin version.

**sponge** · 31-03-2009, 08:09

Originally Posted by Covenant

Farnell has a WM8716 on its site but its got 24 pins-not that one surely?

It's a Wolfson DAC - I assume Stan plans to replace IC2 - The PCM1716E. An interesting mod - I for one look forward to Stan's verdict on the swap.

Also interesting is Stan's suggestion of a LM4562NA in the 1st opamp socket. Just by coincidence, I have a couple on order (I wanted to see what all the fuss was about) - So I'll give it a try.

Ken

**Covenant** · 31-03-2009, 08:19

I have just ordered one LME49720HA. That should satisfy my op-amp curiosity for a week or so!

**Gazjam** · 31-03-2009, 08:24

Originally Posted by sponge

It's a Wolfson DAC - I assume Stan plans to replace IC2 - The PCM1716E. An interesting mod - I for one look forward to Stan's verdict on the swap.

Also interesting is Stan's suggestion of a LM4562NA in the 1st opamp socket. Just by coincidence, I have a couple on order (I wanted to see what all the fuss was about) - So I'll give it a try.

Ken

The first op amp socket and the second....

Which one does what?

I take it the first (the LM4562 one) is for the main Dac Output and the second is the eq phones one?
I.e best to use Lm4562 for the main Dac output?

**StanleyB** · 31-03-2009, 09:10

Originally Posted by sponge

It's a Wolfson DAC - I assume Stan plans to replace IC2 - The PCM1716E. An interesting mod - I for one look forward to Stan's verdict on the swap.

I did it on a TC-7510, but the TC-7510 PCB needs a few other mods before it works properly. I have done it on one early TC-7520 but abandoned the use of the WM8716 in the production version for cost reason. It would have added about £10 to the price of the TC-7520 from the factory floor to the end-user.

**StanleyB** · 31-03-2009, 09:13

Originally Posted by Gazjam

The first op amp socket and the second....

Which one does what?

I take it the first (the LM4562 one) is for the main Dac Output and the second is the eq phones one?
I.e best to use Lm4562 for the main Dac output?

The one above the headphone socket is the line output opamp. The one above the volume control is the headphone opamp.

Experiment and see which opamp combination sounds more pleasant. Since I mentioned the THS4032 a lot of people have tried that.

**trailer** · 31-03-2009, 09:29

Originally Posted by Sensimilia

I did it on a TC-7510, but the TC-7510 PCB needs a few other mods before it works properly. I have done it on one early TC-7520 but abandoned the use of the WM8716 in the production version for cost reason. It would have added about £10 to the price of the TC-7520 from the factory floor to the end-user.

Is the WM8716 a straight swap (ie no further mods) in the 7520 Stan?

**StanleyB** · 31-03-2009, 10:05

Originally Posted by trailer

Is the WM8716 a straight swap (ie no further mods) in the 7520 Stan?

It's a direct replacement. If the U$ had been 2 to the £ it would have been used in the TC-7520.

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