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Pedja Rogic 1541A DAC Custom-Wound Transformer European Union Group Purchase

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#223
Bad news... probably causing further delay

Today I received the pack with the trafos.... just to discover that the "encapsulated" trafos wre simply put in a plastic shell without resin....😱

I sent Tector a email since I NEVER saw a encapsulated toroid without potting... let's see what they'll reply.

This, if all goes well, will cause a further delay.
If things don't go well... :smash: better not think about it.

Cheers

Andrea:dead:
 
#224
I got a reply from the manufacturer, saying that encapsulated doesn't automatically mean potted:att'n:

I insisted that I never saw a encapsulated but not potted trafo and asked for a viable solution.

So far I've been proposed 2 choices:

-Use silicone to hold the trafo inside the shell
-Send the trafos back to be potted with a extra 5ˆ cost per piece...

I'm really sorry for all these troubles...

What would you do?

Cheers

Andrea

PS I can't just refuse the trafos because I've already paid for them
 
#225
Andrea,

Be not dismayed, any of us could have walked into this situation. I sympathise entirely.

I don't know what the rest of the chaps think, but I'm not sure I'd know how to apply the first of these remedies (silicone sandwich). So I guess the latter, with its extra charge sounds to me about the best bet.

But what about postage costs to and from the trafo manufacturer? I take it we'd have to shoulder those also.
 
#226
ctleake said:
Andrea,

Be not dismayed, any of us could have walked into this situation. I sympathise entirely.

I don't know what the rest of the chaps think, but I'm not sure I'd know how to apply the first of these remedies (silicone sandwich). So I guess the latter, with its extra charge sounds to me about the best bet.

But what about postage costs to and from the trafo manufacturer? I take it we'd have to shoulder those also.
Click to expand...

Hi Chris,
thanks for your sympathy.
As for the added shipping costs (in case we choose to go this way) they shouldn't be that heavy (about 1ˆ when it comes to a single trafo)

Cheers

Andrea

PS if someone has a different opinion please tell it!
 
#228
Mixed news

Hi all,
a more accurate test of the trafos revealed a mistake of the manufacturer: only one 80V secondary instead of the 2 asked for.

The good news is that this isn't mandatory for Thorsten's tube stage (was added to give more flexibility) and that to compensate for this we will get the potting without extra costs (apart from split shipping back to Tector).

Unfortunately this will cause a delay...

Cheers

Andrea
 
#231
Hello Andrea, others,

I would support a potted version, despite higher cost.
And while they are back at the manufacturer, they simply might add the second 80V wiring.
To encourage them to do so - while staying friendly - you could set your aspiration level for negotiation. I think in the EU the buyer has a point when things are not made at spec (even if you paid for them already).

Keep it going, Arjen.
 
#234
Can I ask you knowledgable groupies (or any other interested by-stander) a question?

About this secondary for Thorsten's circuit: as per Thorsten's suggestion I plan to use an IXCP10M45S as a Constant Current Source for the valve.

To achieve this Thorsten's circuit recommends '12mA with 100V'. Might I suppose that 80V at 12mA is not going to do it: or is there some way of driving the IXCP10M45S to achieve the desired supply to the valve?
 

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#236
Argh. This is where my raw ignorance comes into play. You appear to be saying that neither Thorsten's 160H inductor nor alternative CCS are necessary to interpose into the feed of the valve.

Thorsten's power supply circuit has no regulators. I do not understand the role of the 160H inductor. I presumed that the IXCP10M45S was a mandatory alternative, and provided some sort of 'super regulation'.

Are you saying that neither the 160H inductor nor CCS would achieve anything? In the case of the former that's an awful lot of money for a part that does nothing.

I wish I knew more about all this. I'm having to weigh the testimony of experts in conflict.
 
#237
No, I'm not saying that.
I was meaning (or trying to😉 ) that using a CCS a regulated supply isn't necessary, just that.

You must use either Choke or CCS, the former with a 75V B+, the latter with a 100V (or thereabout) B+.

Choke is probably the best solution *soundwise* but for those who don't want to pay a arm and a leg a CCS is a good (and much cheaper) alternative.
Then if you are satisfied with the sound you can even think about buying a choke (well ,2...) to further improve the DAC.

BTW I'm going the CCS route, as my signature suggests 😀

Cheers

Andrea
 
#238
Phew, that's a relief - having already acquired the components, only awaiting the Transformer.

Interesting to know that you are going for Thorsten's stage too. Are you toggling between it and Pedja's AD844 stage, or not populating that part of Pedja's board?

I don't suppose you're also using the IXCP10M45S are you? If you by some miracle are, what value are you assigning the resistor connected to the negative terminal?
 
#239
ctleake said:
Phew, that's a relief - having already acquired the components, only awaiting the Transformer.

Interesting to know that you are going for Thorsten's stage too. Are you toggling between it and Pedja's AD844 stage, or not populating that part of Pedja's board?

I don't suppose you're also using the IXCP10M45S are you? If you by some miracle are, what value are you assigning the resistor connected to the negative terminal?
Click to expand...
Hi,
Miracles happen :angel:

Yes I'm planning to use Thosten's stage.
My DAC boards are from the 1st revision, they have reclocher on-board but no I/V. I made one for a friend with OPA660 I/V and it was great.

I have bought the IXYS and also have Gary PIMM' CCS boards.

A quick look at the datasheet (did you look at it??) gives a typical 300 Ohm value for 10 mA current. The graph shows that the R*I product is 3V (well, close enough) so to hit the 12 mA current a first-try value can be 300*10/12 = 250 Ohm.

And, before you ask :clown: a quarter watter should suffice.

Didn't try it yet but I bet that almost any value between 200 and 330 Ohms might work.

Cheers

Andrea
 
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