Mod your Beresford 7520

[HighFidelityGuy]

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

What improvements to the sound quality does the WM8716 make?

[rhmjmango]

Originally Posted by Covenant
So we have a new kid on the block, the LT1364.

One of the mods or Stan should tell us if its suitable-some details:
GBP 70MHz
Slew-Rate 1000V/μs
Supply Voltage ±2.5 → ±15V
Package SOIC8
CMRR 76dB
Function Unity-gain stable, voltage-feedback
Operating Temperature Range -40 → +85°C
Settling time ns to % 50 → 0.1
V Offset mV 1.5

The THS4032 has a V offset of 0.5mV and a CMRR of 100dB

So what are you saying Stan. Do you expect problems using this opamp in the TC-7520? Should i give it a try?

[StanleyB]

What improvements to the sound quality does the WM8716 make?

None I can think of. But a lot of people want the latest DAC chip before they part with their money.

[StanleyB]

Originally Posted by Covenant
So we have a new kid on the block, the LT1364.

One of the mods or Stan should tell us if its suitable-some details:
GBP 70MHz
Slew-Rate 1000V/μs
Supply Voltage ±2.5 → ±15V
Package SOIC8
CMRR 76dB
Function Unity-gain stable, voltage-feedback
Operating Temperature Range -40 → +85°C
Settling time ns to % 50 → 0.1
V Offset mV 1.5



So what are you saying Stan. Do you expect problems using this opamp in the TC-7520? Should i give it a try?

I expect problems. Slew rates of 1000V/uS are sources of HF oscillation. I stay away from those high speeds when it comes to audio circuits.

[HighFidelityGuy]

None I can think of. But a lot of people want the latest DAC chip before they part with their money.

Ah, I see. Personally I don't mind as long as a good chip has been used and most importantly it's been implemented properly. I'll stick with the existing one. Thanks.

[HighFidelityGuy]

My pair of LME49720HA just arrived. It looks like it's going to be a bit tricky to attach the 100nF cap but I'll see what I can do.

Does it matter if one of the cap's legs touches the metal can?

[trailer]

My pair of LME49720HA just arrived. It looks like it's going to be a bit tricky to attach the 100nF cap but I'll see what I can do.

Does it matter if one of the cap's legs touches the metal can?

I'm not using the cap on my 49720's.

[Covenant]

Please correct me if I am wrong about this. The LME49720HA does not require a cap because it is not separated from the socket by an interface board. The capacitor that is already fitted is adequate.

[trailer]

That's what I thought. Hence no cap.

[HighFidelityGuy]

Hmm, when I asked a few days ago if all of the replacement opamps would benefit from the cap, Stan said yes. Could you please clear this up Stan?