Here they like to be wined and dined.sheep are cheap [ obligatory NZ sheep crack]
Unfortunately we don't have so many sheep here in New Zealand anymore, not like the old days. They have been replaced with cows to make milk powder (I think they would be better to make cheese with the milk)
They already have some 3.3 uf electrolytic capacitors on them, but do you think they might be worn out by now since they are from the 70s? They could be up to 50 years old!
I might be able to scavenge some 6.8 uf electrolytic capacitors, but 50v is quite high voltage, so not sure if I will have the right value.
There are plenty of glue blocks in the boxes, so I'll seal up the edges as much as I can and do some listening tests on the woofers using a function generator on the computer perhaps to see what happens when I go up the frequency spectrum.
They already have some 3.3 uf electrolytic capacitors on them, but do you think they might be worn out by now since they are from the 70s? They could be up to 50 years old!
I might be able to scavenge some 6.8 uf electrolytic capacitors, but 50v is quite high voltage, so not sure if I will have the right value.
There are plenty of glue blocks in the boxes, so I'll seal up the edges as much as I can and do some listening tests on the woofers using a function generator on the computer perhaps to see what happens when I go up the frequency spectrum.
Personally I prefer to use music rather than sweeps or pure tones.
Capacitors do not "wear out" as such but the value of electrolytics may change slightly over the decades. The point I am trying to make is that the better caps are more "musical" for want of a better term. 50V is not considered high for crossover caps even if they don't actually see voltage like that.
Putting some polyester batting in them and simply listening for awhile is also a valid option
Capacitors do not "wear out" as such but the value of electrolytics may change slightly over the decades. The point I am trying to make is that the better caps are more "musical" for want of a better term. 50V is not considered high for crossover caps even if they don't actually see voltage like that.
Putting some polyester batting in them and simply listening for awhile is also a valid option
I also don't like to over-react about electros wearing out but there is a back story to it. In the past (say, earlier than the '70s if I have it together here) electrolytic capacitors were often unreliable. Formulas were basic, it was difficult getting a good long term hermetic seal on them, mechanical tolerances were low, cans weren't designed to vent gracefully, voltages were high compared with today, and old ones were often a safety hazard if they even continued to work reasonably.
They already have some 3.3 uf electrolytic capacitors on them, but do you think they might be worn out by now since they are from the 70s? They could be up to 50 years old!
I might be able to scavenge some 6.8 uf electrolytic capacitors, but 50v is quite high voltage, so not sure if I will have the right value.
There are plenty of glue blocks in the boxes, so I'll seal up the edges as much as I can and do some listening tests on the woofers using a function generator on the computer perhaps to see what happens when I go up the frequency spectrum.
Yes, they are likely to have dried out. Old electros were also of lower quality than today. If you add an inductor you will loose efficiancy in the bass-region (due to the resistance of the coil). So just buy a polyprop cap with the same value as the old one. And change the filling to something better for your health.
I have found a supplier of more reasonably priced components.
Polypropylene Film Capacitors | RS Components
I might get some Panasonic capacitors as they sound like they might be reputable:
ECWF2335JA | Panasonic 3.3μF Polypropylene Capacitor PP 250V dc +-5% Tolerance Through Hole ECWF(A) Series | RS Components
Polypropylene Film Capacitors | RS Components
I might get some Panasonic capacitors as they sound like they might be reputable:
ECWF2335JA | Panasonic 3.3μF Polypropylene Capacitor PP 250V dc +-5% Tolerance Through Hole ECWF(A) Series | RS Components
No, they seem to have free shipping. $8.49 total which seems a little bit reasonable.
I wonder if it is worth getting some electret microphone capsules to make some home made microphones at the same time?
I wonder if it is worth getting some electret microphone capsules to make some home made microphones at the same time?
Just a thought: add a second pair of terminals to the speaker and bring the xover outside. Then you can experiment easily with crossover components.
Eric
P.S. and in the future perhaps biamp it with an active crossover or even a crossover implemented by software dsp if appropriate in your setup.
Eric
P.S. and in the future perhaps biamp it with an active crossover or even a crossover implemented by software dsp if appropriate in your setup.
Yes go active if you dare the extra challenge.TPA3116 or 18 costs less than a passive cross over. Otherwise as you state winding coils is not that hard, and any wima capacitor is just fine, or even bipolar. You will find these cheap brand in many good speakers.
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