Ants Beresford TC-7520 mods & guide

Thanks Stanley,

I have the 7520 with 7510+ front board and 12v PSU, so the headphone stage is also receiving 12v, the LED control is running from the 10v Reg (KIA7810) and the DAC as you say - 7805.

I'm swapping the 7810 out for a discrete 12v, is there any reason why I can't run the headphone stage from that too? Any ideas on what current the headphone/variable stage pulls?

Also to note - PIN1B labels 10v & 12v are in reverse in my 7520.

I was planning on removing the KIA7810, tapping the 12v reg ve+ in at PIN1B 12V (marked 10v), remove the PIN 1A to 1B 12v (marked 10v) jumper and linking PIN 1A's 10v and 12v.... Does that make sense?


Thanks,
Ant

On the plug in audio PCB there is a 10V and 12V line in the case of the TC-7520. Use a multimeter to find them ;). Once you have, cut the track where the 12V comes in, and connect the now dead side of the track to the 10V. That's less complicated than messing about around those grey ribbon cables.

Hi Stanley, thanks for getting back.

Don't worry, I wont be messing with the ribbon cables - they disappeared a long time ago:

http://i1088.photobucket.com/albums/...ds/B7520_4.jpg

So it's easy peasy for me to pull a single cable and insert 12v there.

I've noticed quite a few folk have swapped the KIA7810 out for the 12v Murata, in my case it won't be a Murata so will any part of the circuit dislike the extra 2v? ie, LED's etc


Thanks

As long as you use an external 15V PSU, the 12V reg will be fine.

Cheers Stanley,


Sorry, I somehow forgot to mention I'm going 'linear' with 2 PSU's (12v & 5v) hence the questions regarding linking the 10v & 12v rails.

It's all going to live in one box too (render a few posts up).

I'm currently waiting for a few bits 'n' bobs then we're off :)


Thanks,
Ant

Hi Ant,

Good choice I also run 12v and 5v linear supplies and taken out the internal regs. I don't use the headphone / opamps as have gone passive though. My PSU' s are external though.

The PSU was the best upgrade I have done!

Regards

Chris

Quote:

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Originally Posted by chrism

Hi Ant,

Good choice I also run 12v and 5v linear supplies and taken out the internal regs. I don't use the headphone / opamps as have gone passive though. My PSU' s are external though.

The PSU was the best upgrade I have done!

Regards

Chris

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Cool,

Have you some kind of burndy connector between the PSU & DAC? Any photos you'd like to share?

I'm considering implementing a switchable 'passive mode', I want my re-cased version to be complete first time round with all box's ticked.

Ta,
Ant

Hi Ant,

Have a search for "DIY Caiman Power Supply Project". I would link it if I knew how.

Regards

Chris

Quote:

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Originally Posted by chrism

Hi Ant,

Have a search for "DIY Caiman Power Supply Project". I would link it if I knew how.

Regards

Chris

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This one here


"Yes very surprised at the lack of interest with the DIY Caiman PSU project". Me too considering I thought AoS was the home of the Beresford mods? Slap a 1210 sticker on it and all will be good ;)

Joking aside - Good work, those avondale bridges and trackers are nice bits of kit. Did those MUSE KZ's settle down for you?

Ant

Hi Ant,

The Avondale bridges and TPR2 regs are great bits of kit. Les will sell the boards as well if you rather assemble them. My photos have the TPR1 but I upgraded to the TPR2 a few months ago.

The MUZE KZ's are still in and sounding good. I was wondering about trying some solid aluminium caps instead but not sure about them.

Not had ago at the vol pot yet as tempted to wait until Stanley has had chance to develop/complete/test his optical soln.

Regards