[Premium-Rx] Collins 390a, 600 ohm audio

[AB Bonds]

The most direct way of connecting low-impedance headphones or speakers to an R-390 series receiver is with a matching transformer, 600 ohms to whatever (e.g., 8 ohms).  These are usually available at Antique Electronic supply, made by Hammond Transformer.  The alternative is to run the signal through a small audio amplifier, which will give you much more volume (the audio output is quite low on these beasts).  The 600 ohm output can be run directly into line inputs of any kind.  It is balanced, so polarity is not an issue.

A. B. Bonds


> -----Original Message-----
> From: premium-rx-bounces at mailman.qth.net
> [mailto:premium-rx-bounces at mailman.qth.net]On Behalf Of Blair Batty
> Sent: Thursday, August 30, 2007 12:14 AM
> To: premium-rx at mailman.qth.net
> Subject: [Premium-Rx] Collins 390a, 600 ohm audio
> 
> 
> Hi Guys:
> 
> I suppose my Collins 390A receiver wouldn't qualify as a
> premium receiver now, but it was, in its day; it seems to
> me to outperform my Harris 590.
> 
> Anyway, I have an audio question, which may also apply
> to other receivers. It has a headphone jack (600 ohm) on
> the front panel. It is also duplicated on the back, plus
> a 600 ohm speaker output. There is also an independent
> 600 ohm output for a remote audio.
> 
> 1) How do I use ordinary "stereo music" headphones (~8 ohm?)?
> 
> 2) How do I use an 8 ohm loudspeaker?
> 
> 3) How do I connect to the high impedance "line input" of an 
> audio mixer?
> 
> Thanks
> Blair
> 
> Time exists so everything doesn't happen at once.
> Space exists so it doesn't all happen to you.
> 
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