RFZ V781 racked - pix inside

DerEber said:

fgan81 said:

I have 3 * V781 and eventualy a RFZ PSU N 706.
Do you know if the RFZ N 706 could powering up the tree Units?
I need also 6 1:1 Tranformers, right? Any Special type?
What is about Phantom Power? Any DIY Projects?
And last question, do you know similar racking up and good documentated diy Projects?

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Hey fgan81,

with two N706 you could power a whole console. So it is way over for 3x V781. But still it can be done.
One V781 needs typically 45mA. Say not more than 80mA.

Are you aware of the fact that the V781 need -24V supply and how to handle this? Ground is on positive rail.
This is why you possible can not use the supply you linked together with the phantom. But you better ask the seller if it is possible to get positive rail grounded on the 24V side and stack the 48V on top.
Anyway I'd not build it with the N706. Recapping the thing alone will probably  cost more than building a new one with halve the weight.  But if you do not plan to travel with your preamps and as you already have it... why not. 

First of all before racking them, have you tested the units? Are they working and in good condition?
I am asking, because I know them quite well and I had lots of troubles repairing those. But mine came from an old recording truck and were in heavy use.
Would be a shame if you build a cool rack, plug them in and then..... nothing.

You do not need an output transformer if you want to run them unsymetrical. Thats totaly fine.
But most of the 1:1 will do a good job.

And I think there is no documentation for a V781 rackjob here.  But who knows.

best,
Stephan

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Michael Krusch said:

I have scans of the service manual including the schematic. I will make them available asap.

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YannLu said:

Hi there

Does anyone know what are the 3 trimpots for ?
I guess there for adjustment...

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