Adding a normal connection to SRD-7 Pro. - diyAudio
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Old 27th October 2011, 10:06 PM   #1
piknik is offline piknik  Netherlands
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Default Adding a normal connection to SRD-7 Pro.

Hello second post, nice forum very informative.

I have a question , I just got hold of a Stax SRD-7 Pro adapter I misread an d thought that it had the pro and normal connections.
Is it possible to add a normal plug ?

I might have a chance to acquire a stax lambda but of course it has the normal plug.

Any help would be much appreciated.
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Old 28th October 2011, 09:30 PM   #2
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The difference is not only the plug itself, bias voltage is higher for "Pro" models as well. A normal bias Lambda probably wouldn't appreciate that.

Normal bias adapters seem to be a lot less in demand than their pro colleagues, so I'd just shell out for one of these in case the deal works out. Maybe you can acquire a pro bias Stax later, otherwise just sell the SRD-7 Pro again.
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Old 28th October 2011, 09:59 PM   #3
piknik is offline piknik  Netherlands
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I know,
but they also mad the mkII version which has both.
I have been comparing the schematics looking for possibility's.
I also read that the center pin in a normal bias plug is responsible for the left audio.

Found people and sites online that turn normal bias into pro bias and i asked them but didn't get a response yet
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Old 29th October 2011, 07:12 AM   #4
piknik is offline piknik  Netherlands
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So after some digging and opening upping i discovered thanks to the diagrams posted here of the stax srd-7 pro and srd-7/mk2 adapters
that they sport the same pcb.
Even better there are unused holes so theoretically i could just get the corresponding resistors, capacitors and have at it

Notice how it even states N-bias and P-bias right on the board, awesome.
Only question is how can i get the extra plug to work should i replace one of the pro plugs or can i make an extra wire to the outside of the box ?
Did see that the two connectors are paralleled.
Also the middle pin of the normal bias has to be connected to the bottom left pin of the plug ? and then of course connect to the N-Bias connection on the pcb.

I will let you guys know what happens.
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Old 29th October 2011, 10:46 PM   #5
qusp is offline qusp  Australia
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I would ask the guys in the diy area over at headcase, arguably a more hardcore little community there than head-fi.org including Kevin Gilmore who spends a lot of time over there. there are layers like an onion over there though, not all threads are public. there is more STAX diy there than head-fi, watch out for hazing though =P
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Old 30th October 2011, 07:13 AM   #6
piknik is offline piknik  Netherlands
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thanks i wil check it out.

in the meantime i got hold of the extra parts and soldered them in, now for the hard part.

Finding the 78-S6S Amphenol 6-pin socket over here.
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