Cambridge Audio 640C v1 Mods

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#262
Hi Brent.

CAnt wait to do the mods! I was thinking of changing C4 with a 10uf OSCON cap. I should check really if its what I think it is. Is it (C4) the input decoupling cap for the clock supply? If so then Its worth changing it to the oscon right? If im wrong can you tell me where the It needs to go.

Cheers, Mike.

PS, I'll post pics and report here when done so keep an eye out.
 
#269
You may find I was being helpful to people who asked questions, I do not recall many times where you helped, I have spent alot of my time answering questions on here and even more through emails for people who want advise. Some of the time the email conversations spill onto here with regards to 'our products' as I have been asked directly about them.

You should not dismiss products that you have not tried either, I on the other hand have tried most products out there which led me to develop my own products as the ones out there were not good enough or just too expensive.

All you have done is spoil it for those who want to mod the 640 or similar models. People are not stupid they can and will make up their own minds on which product they choose, most people like the advise and help.

Brent
 
#270
This is a free site for enthusiast not a advertising platform for Sercal electronics!

The same three people are always banging on about your products, this obviously makes a LOT of people sceptical as they are associated Secal in various ways.

Giving people advise is commendable but constantly advertising your products while knocking others and dealing out false truths is very unprofessional.

I have tried the S-power, UWB reg, Tentlabs shunts, Audiocom Invisus (mk1 and mk2) and the Superreg (mk1 and mk2 not the mk3). The S-power is not in the same league as the invisus when implemented properly IMHO.
 
#272
Brent.

I know you used to run a Invisus mk1 on the DAC analog supplies on your 63 but the thing that got me was the way it was implemented, for example here is a quote from you on the other thread.

"The 2X 1000uF caps are mounted onto the Invisus pcb, no room around the dac as they are big caps.

My 1000uF are approx 3cm away from the dac on the reg as the Invisus is a bit bulky. I may swap it for a SPower and get it right on the dac."

Local decoupling 3cm's away from the chip:whazzat:
I'm not being funny but what would you expect!

The invisus is awkward to implement but that isn't gonna do it any justice.
 
#273
After that both myself and lee fitted the invisus ontop of the dac (I used 220uF BG FK) and ran it like that a a month or so. It was Lee who tried the SPower first and was very happy with it in place of the Invisus.
The Invisus on top of the dac was a slight improvement over being mounted away as it was before (that's why I moved it).

Fittng the SPower lost nothing whats so ever to the Invisus and if anything the timing improved a fraction. So I sold it.

My 63 has been a very experimantal cd player and as undergone too many changes to mention.

Your quote "The invisus is awkward to implement but that isn't gonna do it any justice". Then I would say it's not an ideal design as any gains it might have over the SPower or indeed another good reg is rendered useless. Why do you think I designed the SPower to be hole compatible with 78XX 79XX (and without the shortfalls of a superreg).

But really Mags we are splitting hairs here.

Brent
 
#275
Mags said:
The Q-Power hasn't been made in a loooong time, the Superreg 3 is £34.95 inc VAT and the Invissus is £81.50 inc VAT.
Click to expand...

Mags said:
I have tried the S-power, UWB reg, Tentlabs shunts, Audiocom Invisus (mk1 and mk2) and the Superreg (mk1 and mk2 not the mk3). The S-power is not in the same league as the invisus when implemented properly IMHO.
Click to expand...

Mags said:
The invisus is awkward to implement but that isn't gonna do it any justice.
Click to expand...

Any relationship with Audiocom or are you just a fan of a faceless company that sells expensive products and has attracted a poor reputation for customer service?

I think it's important to have a sense of balance here.

And I do find these posts hard to read with all the US spellings! :bawling:

Simon (a Sercal/Audioupgrades fanboy for sure)
 
#276
SimontY said:
Any relationship with Audiocom or are you just a fan of a faceless company that sells expensive products and has attracted a poor reputation for customer service?
Click to expand...

No. If you read my post again you will see that I have used parts from many suppliers. In fact I use a mix of Tentlabs shunts and Invisus mk1 regs combined with a PFM Flea for the clock in my player at the moment.

SimontY said:

I think it's important to have a sense of balance here.
Click to expand...

So do many other people. Why do you think people are having a go at Brent Thomo and yourself?

SimontY said:

And I do find these posts hard to read with all the US spellings! :bawling:
Click to expand...

So what???

Cheers,
Mags.
 
#277
rowemeister said:
You may find I was being helpful to people who asked questions, I do not recall many times where you helped, I have spent alot of my time answering questions on here and even more through emails for people who want advise. Some of the time the email conversations spill onto here with regards to 'our products' as I have been asked directly about them.
Click to expand...


I'm not questioning whether you have been helpful. I've done my share of answer questions too, whether you are aware of it or not.

I am pointing out that your signature in particular as well as some of your claims go together to create an impression of advertising, and it's that which has created a certain atmosphere. If you don't want to take this on board - fine, but I'm actually doing you a favour here.

You should not dismiss products that you have not tried either, I on the other hand have tried most products out there which led me to develop my own products as the ones out there were not good enough or just too expensive.
Click to expand...

This is complete nonsense. I have never dismissed your products. In fact I have asked for technical information about both your clocks and your regulators. You have ignored both, which again creates a bad impression.

You're claiming that your stuff is better than other peoples. That's quite a claim, and I think it's quite reasonable to ask you to back it up.

People are not stupid they can and will make up their own minds on which product they choose, most people like the advise and help.
Click to expand...

Agree totally.
 
#278
Ok
The Super reg is a opamps based regulator (like qpower , invisus and ours). The Superreg is basically a Burr brown opamp (for marketing purposes) and an average 2.5V ref voltage circuit with all the capacitors on the pcb being 100nF. So no real tuning there.
The Qpower is an identical circuit to the superreg with a few choice BG Hi-Q caps strapped across the 100nF, this of course is an improvement. The transistor used is a TO220 version of what was fitted to the superreg.
Our reg uses a very low noise precision v ref component and every smt cap is a different value so that it is optimised. One of them is infact 10uF. We did not go for electrolytic capacitors as these can slug down the response time of the circuit. We also use a nice FET (has does the Invisus).
Look I don't want to give everything away about our product but I spent a lot of time working on a package that worked well and could fit in the smallest of places.

With regards to my signature it was done for the cd63 thread started by Ray, there people have seen it develop from basic mods to what it is now and everthing is fine there. Of course when I go onto other threads it's still the same sig :angel:

Brent
 
#279
This thread started off by Thomo saying: " I've made modding my Cambridge 640C player.

Just started with it really - changed opamps to lm4562's"

Does anyone has an opinion about how great an improvement you get out of swopping the NE5532P with the LM4562?
 
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