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Reply to "Senco Sound Tenders"

Does anyone have a recording of a working Senco tender?

If you have, say, 12V AC (60 Hz) on the track, then if directly driving a 16 Ohms speaker that's a whopping 9 Watts of power flowing into the speaker.

Throw in a 248 Hz high-pass filter which attenuates the 60 Hz signal power by 12 dB which is better than nothing but I'm still thinking the low-frequency response of the speaker itself was a significant design parameter.  So while today everyone covets extended low-frequency (i.e., bass response) of 2" speakers in this application I'd think you'd be after more of a "mid-range" type speaker which then again might have been all that was available with the technology of the day.  Very interesting.

On the flip side, did the engine have any mechanism to block the audio signal from materially affecting engine speed?  I'm assuming the "mixer" box is cranking up the phonograph signal to many Volts.  So I wonder if this "system" had the same phenomenon as modern whistle/horn circuits where the engine speeds up when the phonograph is playing a relatively low-frequency whistle/horn sound?!

Anyone have a picture of the "TWO or more" (vacuum?) tubes that I suppose would be in the mixer box?!

Last edited by stan2004

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