4333/S300/L300 equivalent bandbass circuit
I have managed to come up with an equivalent bandpass circuit for the 4333/S300/L300 which negates the need to use the very expensive and hard to find tapped autotransformer.
If anyone is interested I will post the schematic.
Has anyone thought of using charge coupled technology in their 4333/S300/L300's?
If anyone is interested I will post that schematic as well.
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Re: 4333/S300/L300 equivalent bandbass circuit
Here is the schematic.
It's voltage drive is a dead ringer for the original voltage drive as measured on December 16th, 1975.
Most of the components are available from Parts Express. The LF inductor is the 14 gauge perfect layer wound air core. For those who like the signature JBL bass hump at ~ 30 Hz you may need to tune the enclosure up a couple of Hz. All the MF inductors are the 18 gauge perfect layer wound air cores.
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4333/S300/L300 with charge coupled tech
4333/S300/L300 with charge coupled technology
Charge coupled cirquitry for the S3100
I'm the happy owner of four S3100, but nevertheless on the look-out for improvements, so I would like so see the charge coupled cirquitry for this model.
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Re: Charge coupled cirquitry for the S3100
Alrighty then!
Here's the stock schematic.
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Re: Charge coupled cirquitry for the S3100
Let us know what you think if you decide to give it a try. I wouldn't mess up your stock networks, I'd build from scratch.
Use all polypropylene if you can instead of any NPE's.
For those who care, I believe the S3100 MK II is already charge coupled...
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Another picture with 16ohm load.
sorry for this large picture. It's the first time to load a picture.
Series Capacitor Values in CC version of 3133 (MF)
I've been pricing out a charge-coupled crossover for the 4333A and so have been looking closely at the component values for the first time. The charge-coupled pair for the series/blocking capacitor in the MF section is not symmetrical. Is this intentional? The original value is 16.5 uF, so a pair of 33's would do it, but one is labelled 39.
(If someone can get in touch with Giskard on this, I'd appreciate it.)
David
S8 charge coupled network?
This may be a different thread question but has a S8/S20 charge coupled network been worked out to replace the LX5/N7000-N8000 combo? :confused:
Help with charge coupled design
Has anyone put out a diagram for a charge coupled crossover at 500 and 7000 hz? Or can someone note the mods to the Charge coupled l-300 crossover to change it to 500 and 700hz. I am proficient with the restoration and repair thing, but when it comes to design of the crossovers, I wish to leave it to those with more experience. Any help would be greatly appreciated.
Thanks
MB