Trident 80 with V672 summing amps

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RFSiesta

Well-known member
Joined
Feb 20, 2015
Messages
105
Location
Graz, Austria
Hello,
We have an old Trident 80B in the studio and tried two V672 amps for summing - with astonishing results, soundwise.
The only issue that's hard to adress is to get those as clean as possible.
I used a pretty clean, but homemade PSU, will try with a mint condition Telefunken 24V supply next, but I doubt it's the PSU that is responsible for a little hum, noise and a 1k "peep" that's coming with the signal.
I was able to reduce it by trying different connections to ground, but it's still there.
It's not very much, but enough to stop the show for me ;)

question I have is:
How much of a problem is it to send a non-balanced summing bus to a balanced summing amp with transformers at the input?
The V672 have an input impedance of >2Ω, which is NOT zero. So a little bit of voltage will drop over the input, which may or may not be a problem. The original summing board has very close to zero Ω at the input, and summing ground is connected as short as possible to the PCB ground.

Any suggestions?

Thank you!
best
Richard
 

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