Mod your Beresford 7520

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Originally Posted by tizer2000uk

Question for Stan: Without consulting the spec sheet, what other mod would be needed with this opamp to quieten the slight 'pop' when opening a track?

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No idea as yet. I'll have to fit a set of THS4032 in mine again and listen out for the pop you hear.

Quote:

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Originally Posted by trailer

The tab on the cap should be aligned so that it is pointing towards pin8

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Ok I am all ready to have another go. Found the tab you mentioned. Is pin 8 bottom right or bottom left?

Quote:

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Originally Posted by Covenant

Ok I am all ready to have another go. Found the tab you mentioned. Is pin 8 bottom right or bottom left?

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http://img115.imageshack.us/img115/3...re020small.jpg

Thanks Trailer, much appreciated. I had put my opamp in the wrong way around-I used your photo from earlier in this thread but my sockets were 180 degree reversed from yours.
As a result I have damaged the op-amp which plays at very low volume and there is some distortion on the optical input.
So I have reverted to the 4562 which is fine. I will probably leave it a while before messing with more op-amps. :doh:

Right,

I decided to get the original DAC chip put back into the 7510 (otherwise modded with some Black Gates and a 4562). I plugged it back in today and had a listen, compared to my 7520 with the 49720s in.
It still sounds very good indeed. The only thing I would say is that the sound doesn't seem as big. A little thinner if anything. I preferred the 7520.

Through the mailbox this morning came the 4032s from Tirna Electronics.

http://img115.imageshack.us/img115/8...re023large.jpg

I left the 7510 playing for a bit whilst I changed out the opamps in the 7520.
Plugged the 7520 back in and fired up some tunes.

I can safely say that the 4032's bring out the best in the 7520 so far. No question. More natural sounding with all the detail still there. One minor point is that the bass doesnt seem to go as low but I think it is more controlled now.

Quote:

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Originally Posted by trailer

Right,

I decided to get the original DAC chip put back into the 7510 (otherwise modded with some Black Gates and a 4562). I plugged it back in today and had a listen, compared to my 7520 with the 49720s in.
It still sounds very good indeed. The only thing I would say is that the sound doesn't seem as big. A little thinner if anything. I preferred the 7520.

Through the mailbox this morning came the 4032s from Tirna Electronics.

I left the 7510 playing for a bit whilst I changed out the opamps in the 7520.
Plugged the 7520 back in and fired up some tunes.

I can safely say that the 4032's bring out the best in the 7520 so far. No question. More natural sounding with all the detail still there. One minor point is that the bass doesnt seem to go as low but I think it is more controlled now.

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Wow thanks for the write up and picture. I'm really looking forward to getting my 4032s from Tirna Electronics - hopefully they'll arrive tomorrow.

How did you know which way to plug in the circuit board? On the DIL OpAmp chips they have a small mark to indicate pin 1, but I cant see that on the circuit board and don't want to ruin the opamp?

Thanks

Ade

There's a small white triangle on the board adjacent to Pin 1

I bought some adapters that are no good for the TC-7520. http://cgi.ebay.co.uk/Surface-Mount-...3A1|240%3A1318

The pins have a diameter of 0.9mm. It should be 0.5mm!

http://picasaweb.google.com/bbmango7...13169436296258

I will edit this post when the line-up in the pic is not right

Quote:

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Originally Posted by trailer

There's a small white triangle on the board adjacent to Pin 1

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Also, pin 1 solder pad on the adapter board is square - All the others are round.

Is this the right adapter?
http://www.sparkfun.com/commerce/pro...roducts_id=494