Brilliant!!
Waiting on the 5234A,
Signed,
"Stickler"...
Brilliant!!
Waiting on the 5234A,
Signed,
"Stickler"...
bo
"Indeed, not!!"
MAN... looking at Don C's crossover pic- I haven't seen THAT many ceramic-boat resistors together in one place, since I pulled apart a McIntosh ML2C speaker system, during restoration a few years ago!
Hey, did JBL ever use a heat sink for the ceramic resistors in anything? I've seen a few McIntosh speakers that actually did that, and there's some comments from Roger Russell (Mc's primary speaker designer in the 1970s) about doing so... and how doing that improved not only reliability, but dynamic range as well in some small degree...
Regards,
Gordon.
"Hey, did JBL ever use a heat sink for the ceramic resistors in anything?"
Not that I know of. The 7.5 ohm resistor in parallel with the 1.55 mH tapped autotransformer in the L300/4333 is a large 40 W resistor that is mounted alone on standoffs because it gets so hot. It's also inside a metal can/cage so it won't catch anything on fire.
"If only you'd do this commercially..."
I'd build you a pair of 3113B networks Bo.
You might want to try biased instead of conventional though.
I'm not too sure if I will ever build another conventional network for my own personal use.
*****
"the signal paths not to/from the Lpad before leaving the network, but exits the network, goes through the Lpad and then goes directly to the transducers - correct?"
Yes. But biasing some networks (L212 comes to mind) wouldn't allow for that since the conjugates (which would have to be biased as well) come after the L-Pads. Ti series networks are "easy" to bias since they don't use L-Pads at all. 4313/L96/L112/L150A networks are "easy" to bias.
Last edited by 4313B; 07-16-2003 at 06:51 AM.
Be still, my heart... Re-reading, I fear the syntax is ambiguous enough to actually NOT be a firm offer! Drat!I'd build you a pair of 3113B networks Bo.
More than just having them and being able to enjoy them, I wanted to study them in close range and marvel and the design and soldering.
Oh well - at least I have a good picture of your handiwork!
bo
"Indeed, not!!"
Ambiguous in that I don't really see why you would want to rebuild a pair stock unless you wanted that "specific" sound character (which you will never get anyway since those capacitors are long ago NLA).
In other words, I'd pull the stock networks and pack them away and go with new biased networks
If you want a biased pair of 3113B networks, I will build them for you. If you have a different pair of JBL's you'd like to try first, I'll build them biased networks for you too.
Last edited by 4313B; 07-16-2003 at 07:15 AM.
An astonishingly generous offer - that is, so long as it doesn't cost me the 4345's as "barter"...If you want a biased pair of 3113B networks, I will build them for you.
I cherish the 4313B's and can't imagine they - as such - can be much improved on. I've not yet added the bypass caps (they only arrived yesterday! PartsExpress was B/O'd). But now, I may be needing them for the 5234A's anyway! So, you bet!
bo
"Indeed, not!!"
Good Grief! Those AudioCaps were B/O'd that long???
I couldn't believe it either. Made me think the order had been lost/cancelled. When it arrived, I began to wonder if PE was struggling. First orders came with Popcorn - this one in merely a plain unmarked bag.Good Grief! Those AudioCaps were B/O'd that long???
It's tough out there...
bo
"Indeed, not!!"
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