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Old 23rd November 2006, 08:19 PM   #51
mr-mac is offline mr-mac  Scotland
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Location: Dunfermline, Scotland
I haven't had the work done with trichord's people, neither has anyone else on here as far as I am aware. I was only mentioning that from a prev inquiry that I knew the people trichord use to do the work have repaired other PT cardinal, da-capo & ordinal units before so are familiar with the components.

No I don't have an idea of the price of the new filters and Input card, I asked John to email me an idea but as yet am not 100% sure.

It's the little dip switches (can't remember where they were located as it's been a while since I was inside my da-capo). I'll check next time I have 20min to open it.

The caps tend to leak directly underneath and as they are very close to the circuit board it would be almost impossible to see the damage until you take them off.... All of them do leak eventually so I would rather recommend you have them replaced before the unit dies (as the more the circuit damage the more it will cost to repair).

If you want I will try and find the email address of the people who do repair & clock fitting work for trichord and you can contact them to get an idea of price.

John
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Old 23rd November 2006, 10:26 PM   #52
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I was waiting for John W. to email too,
but if you thought the Trichord people
might be interested in having a go?

Still we all have computer problems!

Are all da Capos the same or do they go
in series (Mk1 etc)?
Can I make one good one out of two
damaged?

Sounds like it is worth a try....

Thanks

Alistair
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Old 23rd November 2006, 10:31 PM   #53
mr-mac is offline mr-mac  Scotland
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IIRC all the caps are faulty....

When I say the fancy having a go they are a business who will charge for work done....

I'll dig out the email of the place and you can at least ask for an idea of price.

Cheers

John
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Old 23rd November 2006, 10:47 PM   #54
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Default Lots of parts but where?

Hi

I had the car MOT'd last week and the mechanic agreed another year, spared to indulge my cult in PTs.
Why change something when you like it and you can
get second hand spare parts to keep it going???

I have had a lot of pleasure from the Cardinal and hope
to again when the floor gets laid. I have the foundations
of a great piece of British audio history so I want to build
upon it....

Or perhaps I just do not want to change..

Thanks

Alistair p.
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Old 26th November 2006, 04:08 PM   #55
loris.p is offline loris.p  Italy
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well I contacted Trichord and they answered:


Yes, I have recently carried out this job on an Ordinal.

Many of the caps that I took out were leaking.

I have replaced them with Rubycon ZLH 2200uF @ 25V.

These are a much better cap and suitable for audiophile equipment.

I can supply these to you for £3.50 each plus carriage.

Please let me know if you wish to proceed.


I will buy the caps and then I'll do the job or I will let some
expert friend to do the job for me.
Loris
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Old 26th November 2006, 07:27 PM   #56
mr-mac is offline mr-mac  Scotland
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Super....

Yeah probs cheaper buying the parts and doing work yourself or getting someone local to do the work...

Glad you are on the way to preserving your PT hi-fi kit and hopefully enjoying it for years to come.

John
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Old 3rd December 2006, 01:55 PM   #57
JohnW is offline JohnW  Hong Kong
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Location: Discovery Bay, Prague, Paris...
Default Dacapo Filter Update

Just a brief update.

The new filter module has been tested and is working well - at least the "Filter section" works well. We still need to work on the modulator - or rather the FPGA internal "connection" between the output of the Digital filter & the Modulator section.

Currently the output word length from or filter is 60bits+, and this was fed un-truncated directly into our 5th order modulator. However during listening sessions between our modulator and the Philips SAA7350 - the 7350 won hands down.

The input to the 7350 is truncated to 20Bits (from the output 60Bits+ of the filter) - so we are trying to understand why truncation of more then 40bits input to 7350 sounds better then full 60Bits+ resolution input to our modulator.....

We believe that its has to do with the dithering applied internally to the INPUT of the 7350 - which despite high levels of DC & AC dither suffers terribly from idle tones and the such like.

We believe we now have a better understanding of the problems, and are coding the latest firmware update for the modules FPGA’s – well hopefully get a chance this week to listen to the latest modulator dithering….

More importantly, the update will now consist of a whole new Mainboard – replacing Dacapo’s motherboard and digital filter arrangement…. Once again this will be sold at cost – and is more of a R&D project then any commercial interests… So don’t spend money changing the Dacapo leaky Capacitors – there well be a whole new board available soon.

John
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Old 3rd December 2006, 02:15 PM   #58
JohnW is offline JohnW  Hong Kong
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Heres a Pic. of the new filter PCB (not enclosed in its RF screening Tin), also new discrete Opamp circuits (the 2x small PCB's on the left).

John
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File Type: jpg dacapo filter & opamp1.jpg (43.6 KB, 796 views)
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Old 3rd December 2006, 03:33 PM   #59
loris.p is offline loris.p  Italy
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Default ordinal

even if I undestand almost nothing..... it sounds iteresting
too bad I've an ordinal.
Loris
btw, the caps are already arriving....
so I'm intersted in the transport
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Old 13th December 2006, 07:21 PM   #60
jonyung is offline jonyung  Hong Kong
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John W

Count me in as I have a full working set of DaCapo/DC/Cardinal in Hong kong waiting!

Regards

Jonathan
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