[Hammarlund] Re 600 ohms audio output

[Robert Jefferis]

Rick,

It sounds like you may have found an electrodynamic speaker? If so, the resistance reading of 0.766k, or 766 Ohms is in a reasonable ballpark for the field coil. You would need to provide a rather high DC voltage to the field coil to make the speaker work at all. If it is an electrodynamic, there will be four terminals: 2 for the field coil and 2 for the voice coil. Just can't remember the nominal impedance of electrodynamics, been too many years since I even thought about them. Don't have a clue about the .025 uF cap across the input. It will alter the response.

Bob KF6BC
On Feb 2, 2010, at 3:15 PM, Rick Gouge wrote:

> Ok. i had no luck finding a transformer that will work. But, I did find an old style speaker with a coil instead of the magnet type. It measures .766 k  ... Is that not 766 ohms? would it work? I also notice that there is a .025 cap across the speaker inputs. Rick VE7RiK
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