Mod your Beresford TC-7510

[leo]

Another few idea's

The decoupling cap for the CS8414 analogue and digital supply pins, might be worth trying say a Oscon or similar polymer based cap for the digital pin (VD+) and one of your favourite caps for the analogue pin (VA+)
Its surprising how much effect the receiver has on the sound

May also be worth trying an oscon on the multiplexer chips supply pin (VDD)

For the PCM1716 dac chip look at the caps on pins 11 and 18, these seem to be the voltage reference point for the feedback loop of the chips internal op-amp
Might be worth experimenting there

A note regarding the LM4562, you may get varying results with it depending on interconnect lead lengths, type of amp or pre-amp being used, these chips don't drive capacitive loads too well, its a good op-amp but won't be ideal for everybody
This is not to put people off using it BTW

[kalozois100]

Another few idea's

The decoupling cap for the CS8414 analogue and digital supply pins, might be worth trying say a Oscon or similar polymer based cap for the digital pin (VD+) and one of your favourite caps for the analogue pin (VA+)
Its surprising how much effect the receiver has on the sound

May also be worth trying an oscon on the multiplexer chips supply pin (VDD)

For the PCM1716 dac chip look at the caps on pins 11 and 18, these seem to be the voltage reference point for the feedback loop of the chips internal op-amp
Might be worth experimenting there

A note regarding the LM4562, you may get varying results with it depending on interconnect lead lengths, type of amp or pre-amp being used, these chips don't drive capacitive loads too well, its a good op-amp but won't be ideal for everybody
This is not to put people off using it BTW

a pdf would be very helpful .

[leo]

If I get one of these dacs sometime I'll try various mods and post some results, pics etc
For now I can only post a few idea's maybe worth trying

Do the tweaks Stan added in the pdf first and see how you go

[kalozois100]

If I get one of these dacs sometime I'll try various mods and post some results, pics etc
For now I can only post a few idea's maybe worth trying

Do the tweaks Stan added in the pdf first and see how you go

Hello Leo
yes will do so. If i had two tc7510 i d send one to you and let you loose on it . at moment waiting for mod 21 , LM4562MA opamp replacement and the maplin power supply.
i have read around that mains power supply leads can make a big improvement such as the one mentioned in what hifi awards. also fuses for the plug. any views on this?

[kalozois100]

If I get one of these dacs sometime I'll try various mods and post some results, pics etc
For now I can only post a few idea's maybe worth trying

Do the tweaks Stan added in the pdf first and see how you go

p.s.Leo this is the one i was thinking about.


http://whathifi.com/Review/Clearer-A...e-Alpha-mains/

[StanleyB]

Don't get too carried away with external products that you feel might improve the sound of the DAC. My aim has always been towards trying to keep the changes internal since that is still the cheapest route.
There are loads more mods that can be done to the PCB, but many of them require extreme skills. Like swapping the PCM1716E for a WM8716. The two chips are pin for pin compatible, but the WM8716 has not got an analogue filter circuit built in, whilst the PCM1716 does. So to do that mod requires a few other associated mods. Then there is the CS8414 timing mod for reduced jitter. Etc. etc.

stan

[kalozois100]

Don't get too carried away with external products that you feel might improve the sound of the DAC. My aim has always been towards trying to keep the changes internal since that is still the cheapest route.
There are loads more mods that can be done to the PCB, but many of them require extreme skills. Like swapping the PCM1716E for a WM8716. The two chips are pin for pin compatible, but the WM8716 has not got an analogue filter circuit built in, whilst the PCM1716 does. So to do that mod requires a few other associated mods. Then there is the CS8414 timing mod for reduced jitter. Etc. etc.

stan

i think there would be a market for the modifications you mention if it was offered as an option on your web site. eg say the tc7510 6/4 plus say 100 to150 euro upgrades. i would certainly have appreciated the option when i purchaged it before.
Anyway i am only upgrading with avenues you approve of Stan.
Thanks for your feedback
kalozois

[NRG]

Don't get too carried away with external products that you feel might improve the sound of the DAC. My aim has always been towards trying to keep the changes internal since that is still the cheapest route.
There are loads more mods that can be done to the PCB, but many of them require extreme skills. Like swapping the PCM1716E for a WM8716. The two chips are pin for pin compatible, but the WM8716 has not got an analogue filter circuit built in, whilst the PCM1716 does. So to do that mod requires a few other associated mods. Then there is the CS8414 timing mod for reduced jitter. Etc. etc.

stan

Stan, I'd be interested to learn more about these mods.

Update:
I ran my DAC continuously for 24hrs with the new 5v ALW reg and the sound has now settled IMO. I was still not happy with the low bass quality and went back to the original configuration as a sanity check...what I discovered is that the small (11R ?) surface mount resistor in line to the supply of the opamp is needed, feeding the 12v from the ALW reg via this resistor fixed the low bass.....I have no idea why but without it there was something missing...with it everything fell into place.

I also tried listening without the input PSU caps as you suggested, I didn't loose any bass but I found the sound stage became confused and muddled....very strange. I then tried a single 4700uF Blackgate as a replacement and I was taken aback...

What a difference this made, simply more of everything, I highly recommend to anybody replacing the two PSU caps with a good quality replacement it made a very noticable improvment in my system.

[Jag.Crusher]

Apologies if this question has been asked before but...

Is there any way to tell how old - or what mark/version - a Beresford 7510 is by its external appearance or possibly serial number?

Many thanks!
Steve

[leo]

I was thinking, after we get a good collection of tried and proven tweaks on here it maybe worth doing a Wiki , should make things easier to find for those wanting a bash.
Anyway lets see how things go