[Vintage-Audio] Re Teac FM Copy

Tue Jun 18 21:14:01 2002

Hello Duane,

It's been a long time. But, I have a couple of leads you could check out.
1.   The "vintage" stereo receivers had a filter to minimize the 19KHc
Pilot tone (that tells the receiver "this is a stereo signal- not mono.
The recorder switch brings-in a hi-enphasis network to restore some
of those lost highs.

2.   FM circuitry includes a pre (post?) emphasis circuit to keep overall
freq response in proper perspective.on the receiving end.
*If* the recorder output is tapped-off prior to this network,  the
recorder would nead this provision to make-up for the "missing" network
that is in the receiver.

3.  As I recall, FM freq response was normally limited to 15KJHz on the
hi end.  Perhaps the switch allows you to get some of the "shimmer" of
the hi's above this point.

I, myself, tend to believe the third possibility  more than the first two.
But, Maybe these give you something to think about and experiment with.
Remember-- Most natural sound is what counts, not necessarult the nrightest!

Any one have better ideas?

Allen

"Duane Fischer, W8DBF" wrote:

>
>
> The Teac model A-5500 has a switch marked: FM Copy on/off. What is its intended
> purpose? I noticed while listening to a vinyl recording being sent through the
> source in monitor mode that having this switch turned on increased the highs. I
> though this curious. What is the real deal?
>
> Thanks.
>
> Duane Fischer, W8DBF
> [email protected]
>
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--
73 de Rev. Allen, KJ6XH      Real Radios glow in the dark!
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