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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Re: Jensen PM10C posted by JP van Son on April 9, 2005 at 13:49:06:
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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- Re: Jensen PM10C - corerosin 15:14:02 04/09/05 (0)
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