[BC] processing way back when

[Lane Lindstrom]

----- Original Message ----- 
From: "Milton R. Holladay Jr." <miltron at mindspring.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Tuesday, December 19, 2006 7:37 PM
Subject: Re: [BC] processing way back when


> The BA-5 was all audio and took up about two feet of rack space. The one
> that used RF was its successor, but I don't know the model #; I only saw
one
> once, briefly.....
> M

Have a BA-5 that is missing the power supply. It had a lot more control over
the audio than the 96A and 86A even with the factory modifications. They
were sure built hefty.

Lane


> ----- Original Message ----- 
> From: "Robert Orban" <rorban at earthlink.net>
> To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
> Sent: Tuesday, December 19, 2006 7:50 PM
> Subject: Re: [BC] processing way back when
>
>
> > At 10:03 AM 12/19/2006, Mark Humpfrey wrote:
> > >Not the first limiter, but possibly the first "look-ahead" limiter was
> > >the General Electric BA-5-A, which is shown in my 1947 GE broadcast
> > >audio catalog.
> > >
> > >According the the catalog blurb, its initial development was done by
> > >the CBS technical staff, and it included a delay line in the signal
> > >path, to "delay the signal until bias generator circuits have time to
> > >reduce the required amplifier gain", and also had a dual-time-constant
> > >release "anti-pump" circuit.
> >
> > When I was working at a summer job at WPAT in 1968, they had one of
those
> > on their AM TX (an old Federal 5 KW with a separate vault for the
mercury
> > vapor rectifiers and mod transformer!). The GE had LOTS of tubes. IIRC,
> the
> > audio was modulated as RF to permit gain control in the RF domain
without
> > thumps. As far as I know, they also used an RF delay line for the audio.
I
> > can attest that the unit had good peak control, probably thanks to its
> > look-ahead design.
> >
> > My recollection was that the GE unit sounded good by itself. Later that
> > summer, they added a tube-type Audimax to the chain.
> >
> > The Chief Engineer at the time was Paul DiSavino (sp?) who later left
the
> > station and started a used broadcast/pro-audio equipment dealership.
> >
> > Bob Orban
>
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