RCA BC-6B Console Project

[systemtruck]

I think (not sure) that has been replaced by the tech docs section.

Cheers

Ian

Which I still can’t find haha.

 

[ruffrecords]

Which I still can’t find haha.

Click on forums (top left).

First item at top of list is tech docs

Cheers

Ian

 

[emrr]

Back to the RCA Hi-Z mixing - the Altec 230B console manual is now in the tech docs for comparison of method.

 

[mkiijam]

I have a BC-3B I'm working on. I'd like to make it "stereo." Should I just duplicate the Program booster amp and get a new output transformer from Cinemag?

 

[emrr]

I have a BC-3B I'm working on. I'd like to make it "stereo." Should I just duplicate the Program booster amp and get a new output transformer from Cinemag?

It will certainly sound different on the new path unless you match up the magnetics with either new or old parts. I’d look for orig parts over time until they show up; they do.

 

[systemtruck]

Yeah you would be better off either waiting to find one more original transformer, or just getting a pair of something new and stop using the one old transformer. It’ll never sound original, but it surely could sound terrific I would assume.
The Cinemag 9600T has a tertiary winding that is about 26:1 or 27:1 ratio, as David told me just recently. I believe there’s a very good chance that this will mean the NFB signal from transformer won’t be strong enough to match the tertiary winding of the original RCA which is still an unknown. But, maybe it is strong enough if a low enough value NFB resistor is used. I haven’t done any guess-math on the original tertiary.

I very much considered building this program amp, and maybe I’ll come back to it, but for now I’m focused on single ended program / pre amps.
I’m also not sure about the impedance of the original transformer. The Cinemag is 9600T is meant to be 15K. The peerless 217D is also 15K, and that one is used in the Pultec EQP-1A which has basic Push Pull 12AU7’s, where as the RCA is parallel push pull. So from this I would assume that the transformer primary for the RCA should actually be somewhere around 7.5K. But I haven’t really confirmed this either.
Lots of unknowns but one thing that’s fore sure is it won’t sound the same as the RCA transformer.

 

[MidnightArrakis]

I very much considered building this program amp, and maybe I’ll come back to it, but for now I’m focused on single ended program / pre amps.

[I very much considered building this program amp, and maybe I’ll come back to it, but for now I’m focused on single ended program / pre amps] -- Which one(s)?.....






/