BA283 and Other Channel Amp Talk

.

you should make a habit of searching the forum first.
many similar questions have been asked and answered in the past

here's one related to your question.

https://groupdiy.com/index.php?topic=14641.0

Why do you want to use the ba283?
There are a lot of other circuits to pick from but why that one in particular?
If it's for the 'Neve sound' a large part of the sound came from the transformers.  There's no way really getting around it.  Most of those Neve fanatics would tell you same thing.

80hinhiding said:

I found this document for the BA283: http://www.technicalaudio.com/neve/neve_pdf/1073-fullpak.pdf

Does the circuit work well without an input transformer?  What is the B- value of A?  Is RV1 a gain control?

Adam

Click to expand...

it works fine without an input transformer. Don't know what you mean by B value of A? RV1 sets the bias current in the output stage - it is class A so you do need to do this.

Cheers

IAn

At Neve, 0V was known as B negative or B-.  A left over from the days when it meant battery negative.

Cheers

Ian

80hinhiding said:

I found this document for the BA283: http://www.technicalaudio.com/neve/neve_pdf/1073-fullpak.pdf

Does the circuit work well without an input transformer?  What is the B- value of A?  Is RV1 a gain control?

Adam

Click to expand...

You can run it without an input transformer, but you must have the output transformer (LO1166) or inductor (LI1310) in place, even to use the unbalanced output.

80hinhiding said:

I see in the SSL 4000 schematic they used a FET after the receiving amplifier, and I don't know why really.

Click to expand...

Probably as a switch, afaik there were no FETs in SSLs for amplification (apart from the listen mic comp, but that is for gain reduction).

Michael