Mod your Beresford 7520

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10-05-2009, 07:44
jon1

Quote:

Originally Posted by leo

With all the 7520's out there I'm amazed nobody has tested a load of this stuff :scratch:

Stans already done the hard bit designing the thing, you'll have to share mods if your wanting to squeeze that last ounce out of it

Leo...that's your department..joking aside...I got that diy dac from hong kong ..built it with a bit of help from a mate..He put the last few bits on and desolder a few more..had them in the wrong place...He tested it no joy ..The SAA7220..has a fault..so contacted the supplier for a replacement..One has being shipped..But still waiting two weeks now:(So that is the state of play at this moment in time..the project has stopped ...Will post some pics when it is up and running ..

jon
10-05-2009, 08:30
Covenant

Is the LT1364 available in the UK?
10-05-2009, 08:34
trailer

Quote:

Originally Posted by Covenant

Is the LT1364 available in the UK?

Farnell is your friend.
10-05-2009, 09:13
sponge

Are we back on track now?

I've spent my pocket money this month on AMB's γ1 (Gamma 1) portable DAC kit (awaiting parts as we speak) - So here's a couple of suggestions for you guys to try:

The AD8620 - I know it's a FET input op-amp, but I have used it in the past and found it difficult to beat if you prefer a more forward sound. Quite expensive at the moment though and only available in SOIC. But these guys do a pre-mounted chip: http://cimarrontechnology.com/pre-mo...0-970601s.aspx and their shipping is very reasonable.

The AD826 - I have never used this op-amp, but it gets good reviews on the forums. May be a bit of a handfull to control like the THS4032, but the spec sheet is very impressive. Price is reasonable at about 5GBP, but it does come in 8pin DIP.

OK, I am looking to Stan or Leo for their advice next - I have been pondering whether it would be worthwhile upgrading the electrolytic capacitors on the HA board of the TC-7520 to something like Rubycon ZA or Nichicon "MUSE". Is it worth the effort? What are the likely sonic gains, if any? Your help will be appreciated.

Ken
10-05-2009, 09:45
StanleyB

Quote:

Originally Posted by sponge

I have been pondering whether it would be worthwhile upgrading the electrolytic capacitors on the HA board of the TC-7520 to something like Rubycon ZA or Nichicon "MUSE". Is it worth the effort? What are the likely sonic gains, if any? Your help will be appreciated.

The case won't close. Those caps I am using are special audio grade caps in any case. Did you not notice that they have a larger diameter compared to general purpose caps?

Stan
10-05-2009, 10:14
sponge

Quote:

Originally Posted by Sensimilia

The case won't close. Those caps I am using are special audio grade caps in any case. Did you not notice that they have a larger diameter compared to general purpose caps?

Stan

They are pretty close to the Rubycon ZA's size wise - The ZA 220u is a little taller though. But if you say the fitted caps can't be improved on, that's good enough for me.:respect:
10-05-2009, 10:28
StanleyB

My caps use a secret ingredient: hemp:eyebrows:. From there my handle 'Sensimilia' :smoking:.

Stan
10-05-2009, 10:38
sponge

Quote:

Originally Posted by Sensimilia

My caps use a secret ingredient: hemp:eyebrows:. From there my handle 'Sensimilia' :smoking:.

Stan

That explains the certain "laid-back" quality of the DAC...;)
10-05-2009, 10:48
leo

Quote:

Originally Posted by jon1

Leo...that's your department..joking aside...I got that diy dac from hong kong ..built it with a bit of help from a mate..He put the last few bits on and desolder a few more..had them in the wrong place...He tested it no joy ..The SAA7220..has a fault..so contacted the supplier for a replacement..One has being shipped..But still waiting two weeks now:(So that is the state of play at this moment in time..the project has stopped ...Will post some pics when it is up and running ..

jon

Jon,

Sorry to hear about the ebay dac, maybe best to start another thread discussing this one but you sure its just the SA7220 which is at fault? Did you try bypassing it? If the rest of the dac is ok you should be able to run it in NOS until you get a replacement SAA7220
10-05-2009, 10:51
leo

Quote:

Originally Posted by Sensimilia

My caps use a secret ingredient: hemp:eyebrows:. From there my handle 'Sensimilia' :smoking:.

Stan

Manila hemp, like Silmics and the Panny ECA (audiograde) :smoking:

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