[R-390] Tellabs Speakers

[eldim at att.net]

Hello Barry & Crew,
>From past experience in the 60's & 70's I can say that TELLABS makes an excellent quality,  rugged and good looking Speaker with superb audio in the voice range.   We installed these in our Command Posts monitor Radio Traffic and other application such as monitor voice land-line communication.  These do have multiple impedance which is accessed from a bottom screw terminal board.  There are also, jumper arrangements to permit parallel operation.  If memory serves me correctly, I believe that they will operate on different DC Voltages between 18 to 48 volts.  If they are new, I would definitely grab them all.  If they are clean and in good physical condition, I would still take them.  These speakers are designed for continuous operation 24/7/365 day operation.  The current of 900 ma is for max volume and will operate at a lower current ratings with lower volume levels.  Also, I take it that the engineers at Tellabs specified the higher current so that the external power unit would o
perate cooler.  Each of our console positions had three speakers operating from one power supply.

73,
 Glen Galati, KA7BOJ
Tacoma, WA

ps. A very blessed and Happy Mothers Day to All our wonderful mothers, past, present and to come.

-------------- Original message from "Barry" <n4buq at knology.net>: -------------- 


> The local old-timey electronics store is going out of business. I visited 
> this morning (their last official day) and browsed the aisles. I didn't 
> find anything I couldn't live without (even at 50% off everything), but I 
> did come across a couple of Tellabs speakers and I wondered if anyone out 
> there might be interested in them. 
> 
> These are some kind of communications speaker made for the 
> telecommunications industry and are housed in a very nice heavy all-aluminum 
> housing with brushed aluminum front and trim and a gray gloss "shell" for a 
> back. All in all, a very quality-looking speaker (although I didn't hook 
> them up and see what they sounded like). 
> 
> I think they have a 4" speaker with an on/off/volumn control on the front 
> and from what I could tell, they had an internal amplifier. There is a 
> little red LED on the front assumably to indicate when the power is on. 
> They also come with a data/instruction sheet with wiring diagram. If I 
> recall, they needed some 30 to 50VDC for a power source and, again IIRC, 
> about 900ma (seemed like a lot of current draw to me). 
> 
> At any rate, the thing that made these interesting is that they apparently 
> have several impedences for input, 600-ohms being one of them. Don't qoute 
> me on this, but I think they also had 8-ohms and maybe something higher than 
> 600-ohms as well. 
> 
> All-in-all, these appeared to be quite nice. If I still had some mil-radios 
> with 600-ohm output, I would have gotten at least one of them but passed. 
> If anyone thinks they might be interested in these (in a "man I saw one of 
> those one time and would kill to have one now", etc.), I think I can still 
> get them even the store is officially closed (and they didn't sell them). 
> 
> Just wanted to let the group know in case they are uber-cool and I just 
> didn't realize it. 
> 
> Barry - N4BUQ 
> 
> 
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