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Well all, I’ve just come back from hitting the garage sales with a new adoptee ($1 for an old speaker cannot be considered “buying,” imho) and hope some of you may know something about it.The single speaker in question is mounted in some wall hanging unit that makes me think ‘50s, though I can’t be sure as that was around a few decades before I was born. The driver has a blue rectangular metallic sticker on the magnet cover that identifies it as a “Jensen PM Speaker” with small text saying “The Name Insures the Quality” and the requisite “Jensen Radio MFG. Co. address.” Now, the best I can figure represents the model number is the stamping of “?S? T246 PM10C C1057 4.” I’m guessing the model is PM10C.
Now, this driver doesn’t seem to be all that impressive, being a 10 inch where the surround is actually a continuation of the cone material and the dust cap is just a round piece of felt. Still, it doesn’t sound half bad and I’m just plain curious as to what this little fella is.
So, anybody know more about this Jensen?
Follow Ups:
Jensen PM10-C. 6 Ohm impedance. 9 watts output. 1.36 millions of ergs. Stock number is ST-246. Original sale price of $13.50, not in the 1950's, but rather the 1930's.
The 1930's, really? I didn't realize it'd be that old. Is there any way that I might use the serial number to date it?Also, pardon my ignorance, but what do you mean by "1.36 millions of ergs?" I'm clueless there.
You don't have to give a dyne what the hell an erg is; all you have to know is that the lower the number, the less magnetic energy is in the gap and consequently the less dynamic the driver is. For instance, in the Concert series of Jensen drivers, the R types had a gap energy of 2.2 and went up to 6.6 in the N types. As for dating the driver, you should look on the frame for a 6 digit number which starts with 220---. The 220 is Jensen's manufacturing code, the next single number is the year of manufacture, and the following two digits indicate the week of that year. To give you an example, for a Jensen driver made in May of 1954 the number on the driver would be 220424. The problem is that I don't know how long the PM10-C was made. If it was only made in the 1930's, there's no problem. However, if it continued in production into the 1940's or 1950's, then you're just guessing. On most drivers, one would have the speaker box or the console to aid in guessing which decade would be correct. Unfortunately, that is not the case bere.
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