Glen,
Any information of the value / voltage ratings of the capacitors (C1-C3) or are they covered in black tar? I wouldn't be surprised if they needed replacing after 55+ years.
Thanks!
...
Type: Posts; User: Howe; Keyword(s):
Glen,
Any information of the value / voltage ratings of the capacitors (C1-C3) or are they covered in black tar? I wouldn't be surprised if they needed replacing after 55+ years.
Thanks!
...
Glen,
Thanks for your help. I should have dug deeper. I'll give a critical test with my function generator. I've already done a casual sweep but I'm not convinced I'm getting that kind of...
Does anyone know approximately at which frquency the N1000 and the older N1200 (without selector switch) are supposed to cross over at? I'd like to verify my crossovers are working correctly using...
That is an interesting schematic. I've never owned a N1200 with a selector switch for HF attenuation. I should assume the not so fully featured unit or a system with a selector placed elsewhere in...
Glen,
Nice job. I think this clears up the connection configuration. I'll assume the early N1200 follows the same. Would be nice to compare schematics though. I'm also assuming the R1-R3...
Glen,
Thanks for clearing that up. I do wonder at this point if there is padding on the N1200 that comes with the later system. Serial numbers match up so it could be but then again, I do...
I have green and black wires from the D175 and yellow and black wires from the woofer pair so I'll assume from this that black is common and will be the center terminals or 2 & 3. Interesting that...
[QUOTE=Howe]I'm very pleased with the excellent work done by Michael Christ (http://www.michaelchrist.com/). The prima vera blonde grain is matched and mirrored from left to right as perfect as...
BTW, does anyone know how to determine the polarity of the terminals on the cross-over I have pictured above? I don't see any "+" or "-" symbols for either input or output.
Thanks!
Howe
We finally got the speakers in. Its just wiring them internally, testing and then putting the remaining sides on and then placing into the corners of the room. Oh, and after all that wiring up a...
Here are pics of the cross-overs as requested.....
I wondered about the saw dust! Thanks for clearing that up. :applaud:
Only one has the race track Van Nuys label. The other has a Los Angeles label. The serial numbers match in each "system" but not left and right, as shown.
These are certainly early JBL speakers...
Here's a pic of one of the cabinets that was restored. I'm very pleased with the excellent work done by Michael Christ (http://www.michaelchrist.com/fabrication.html). The prima vera blonde grain...
John,
At this point the fronts are covered with the new grill cloth. Many staples were used to insure straight lines in the patterns. So the photo opportunity has passed on those. However, they...
Thanks! I realize these may not be the best sounding JBL's ever produced but from my preliminary tets, they are a lot of fun. I get this funky smooth sound that brings back memories of good juke...
Reached the limit of 5 pic uploads so here's the last 2.....:)
I believe the serial numbers indicate manufacturing dates of 1949 and 1951 repectively but I welcome any expertise so I that I know...
Its been a 6 month project. I originally found these as a pair but not perfectly matched. One had an enclosure made of redwood plywood and the other was a mahogany vernier. Both were pretty rough....
Now that you mention it, mine are 130A's and not with the "D" prefix. That is an interesting dialogue about the "D" prefix. Nice to know! :)
Thanks for clearing up the aluminum vs. paper cap...
I see a lot of D130 drivers with the aluminum domed dust cap but yesterday I picked up a pair of 16 ohm signature series D130A's and they have the dark grey paper. The cones have the white JBL...
i have a friend in Sacramento who has an orginal single unit. Its a long drive up there from SF, Perhaps I can get him to do a high resolution photo of his and proceed towards my goal. He admits...
Restoring a pair of D1050 cabinets. These are the early 1950's tall corner speakers with 2 32 ohm 15" woofers and 175 celled horns. Doing a total re-vernier in either Prima Vera Blond or the Dark...