Reducing cross-talk in an 80 series Neve

[jrowell]

Do not interchange BO aka B- with busbar B0, chassis or shields of audio runs in a vintage Neve.

They must be considered and treated separately.

There is no need to go to a balanced mix bus.

That can cause other issues when implemented in a functional console.

The Neve mixing system works very well when all original Neve design concepts and implementation are strictly adhered to.

That is the key. Issues may occur but the real source of the problem must be located and resolved without fundamental changes to the Neve system.

There may be methodologies that would seem to give quicker, simpler or better results but they invariably add to the seemly random performance issues and detract from the excellent results the original system is capable of.

Work the problem and find the issue before changing things around.

The Neve method works, when the implementation is sound or the issues preventing that are addressed.

James

 

[jrowell]

I know from experience that the frustration can mount quickly. Keep working the problem step by step and you will be rewarded with all that a full Neve console can be.

They designed the buss mixing to be able to survive broadcast installations near high powered RF transmitters.

The ingredients are all there, you just have to freshen the meal.

Talk soon,

James

 

[nielsk]

jrowell wrote:
"Do not interchange BO aka B- with busbar B0, chassis or shields of audio runs in a vintage Neve"

Please explain.
As far as I can see, there is the chassis ground, which should only be comprised of console metal and shielding (no audio circuits),
AND the 24 volt ground, AKA B- or B0 (maybe we can decide on one to reduce confusion).
The ONLY place these should be joined is at the technical ground bolt on the frame (correct?)
The 24 volt ground is used for audio circuits (these should ALL be terminated at the copper buss bar, correct?) relays and bulbs (terminated at the power entrance block)

Yes, ALL the unbalanced runs are using the audio ground (which at some point hits the copper buss bar) as the shield AND the low side of the signal. Seems an odd approach, if a shielded pair was used with one for the low side, and the shield to chassis as in all the balanced connections, wouldn't this increases shield effectiveness?
Comments?