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-   -   Salas DCG3 preamp (line & headphone) (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone.html)

Salas 11th January 2017 08:29 AM

Quote:

Originally Posted by Hikari1 (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4947666.html#post4947666)
Thanks. Will check with load before. Or I can just bring down the psu voltage a little with a resistor swap.

There are little Mosfet adjustable constant current load things you can make for such jobs since you test various stuff often. Like this Pico Load Kit - 2 Amp Adjustable DC Electronic Load - ubld.it - TrueRNG and Electronic Kits

Unless you get something like this :D

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.


For now though make do with this :)

https://www.dhresource.com/260x260s/...ment-power.jpg

Marra 11th January 2017 03:24 PM

We have music :D I completed the assembly of my DCG3 on its plank of wood and spent a pleasant couple of hours listening to Act 1; Kate Bush Before the dawn and Yello Touch on headphones. The headphones are an old pair of Leak 300 isodynamics which I bought in the early 1980's. they had been at the back of the wardrobe for close on thirty years and I was surprised that they hadn't disintegrated never mind sounding as good as they do.
The bias is running at 122ma and offset is sitting at 0.01/0.02mv with the heatsink which is a piece of 10mm thick alluminium 250x80mm sitting in the upper 30's.I'll check that tomorrow when I find my t/c for my dmm.
Gonna have a good listen tomorrow through the PMC's.
Thank you Salas another good one:cheers:

Salas 11th January 2017 04:55 PM

That's great. Off to a nice start then. Are those cans planar magnetic type by any chance? Old planar ones were heavy in general lacking highs never challenging a Stax. You will surely discover more music tomorrow on the PMCs

P.S.
Plank ancient diy ritual assembly photo required :D

Ryssen 11th January 2017 05:04 PM

Marra,Im looking forward to the temp messaurement,I am planning to use the bottom of my chassie as heatsink,its only 1mm thick...... :p

Marra 11th January 2017 07:10 PM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4948208.html#post4948208)
That's great. Off to a nice start then. Are those cans planar magnetic type by any chance? Old planar ones were heavy in general lacking highs never challenging a Stax. You will surely discover more music tomorrow on the PMCs

P.S.
Plank ancient diy ritual assembly photo required :D

Definitely looking forward to listening through the main system.I will post some pics tomorrow. A bit of information here.

IC/WTT: Leak 3000 vintage ortho(NOS in box)

Salas 11th January 2017 08:16 PM

They are planar magnetic alright and a very rare model to have at all not to mention intact these days. Some collector somewhere is surely looking for.

Did you manage any good levels at 3x with them? They must be very difficult to drive anyway even if the magnets are potentially still strong enough.

Hikari1 12th January 2017 04:51 AM

1 Attachment(s)
Question about the LED orientation on the boards:

Typically the square pad on the pcb indicates cathode (neg) I think. The silkscreen on the pcb says square pad is positive. I believe the silk is correct? Get this wrong and bad things could happen.

Silkscreen is correct?

alexkosha 12th January 2017 04:58 AM

https://uploads.tapatalk-cdn.com/201...00862ae651.jpg


Sent from my iPhone using Tapatalk

Hikari1 12th January 2017 05:21 AM

Quote:

Originally Posted by alexkosha (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4948752.html#post4948752)

Thanks. Too little sleep is my excuse.

Marra 12th January 2017 06:17 AM

I think there is a pic on Teabags blog which shows short lead to square pad.


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