Recapping L250s - Need Schematic

[Zonker92]

Anyone done it? Does anyone have the schematic? I have only the L250Ti schematic. I haven't found the L250 schematic anywhere. (I know I can pull the crossover boards and read the values off, but I also would like the schematic itself.)

Also, if I ever swapped out the mids and tweeters to match the L250Ti (104H mids instead of LE5-11s, and 044Tis tweeters instead of 044s) should I update my crossover to the 250Ti design?

Edits:

Is it worth recapping the bypass caps, too?

I've already reviewed this thread: http://www.audioheritage.org/vbulletin/showthread.php?16501-L250-vs.-250Ti-Crossovers, showing photos of the two boards, and gotten hi-res versions from the kind OP.

Thanks!

-e-

[JeffW]

Have you checked your other thread? There's a couple of posts linking to the L250 schematic there.

And pretty sure there are threads here discussing upgrading the L250 to the 250ti.

Edit, sorry, wasn't your thread


http://www.audioheritage.org/vbulletin/showthread.php?16501-L250-vs.-250Ti-Crossovers&p=316061&viewfull=1#post316061

[Zonker92]

Ah, I missed those replies. (Forgot to subscribe to that thread.) Thank you, Jeff!



pretty sure there are threads here discussing upgrading the L250 to the 250ti.http://www.audioheritage.org/vbulletin/showthread.php?16501-L250-vs.-250Ti-Crossovers&p=316061&viewfull=1#post316061

Yes, after posting here I found one of those, basically saying you should upgrade the crossover at the same time as the components.

Thanks!

[Zonker92]

OK, I think I’m seeing (per speaker):

4 uF (or is it 40?) (x 1)

10 (x 3)

7 (x 1)

3 (x 2)

Plus bypasses: 0.01 (x 5) and .005 (x 4)

Right? Thanks.

[Zonker92]

Does anyone have a higher res copy of the N250 schematic? I can't make out many of the values. Thanks!

[Zonker92]

Just a bump here; still hoping for a better copy of that schematic. Thanks.

[4313B]

I posted a readable copy somewhere.

[roy55]

Just a bump here; still hoping for a better copy of that schematic. Thanks.

I have a pair of L250 that were recapped. I don't have a better copy of the schematics. Here is a link of pictures. I will double check the values of the caps and get back to you, when I get home this evening.

http://www.audioheritage.org/vbulletin/showthread.php?28744-L250&p=289023&highlight=#post289023

[Zonker92]

I posted a readable copy somewhere.

Thanks; searching now ...

[Zonker92]

I have a pair of L250 that were recapped. I don't have a better copy of the schematics. Here is a link of pictures. I will double check the values of the caps and get back to you, when I get home this evening.

http://www.audioheritage.org/vbulletin/showthread.php?28744-L250&p=289023&highlight=#post289023

Oh yeah; I saw that. Thanks so much! I can read most of the caps OK from photos and the schematic, but not all the coils and resistors. I really appreciate it.

[4313B]

6.2 mH 6 dB per octave low pass
40 uF & 5.1 ohm shunt conjugate (mitigates LE14H reactive inductance)
51 ohm shunt (mitigates LE14H motional impedance)

30 uF (10 uF x 3) 6 dB per octave high pass
1.6 mH 6 dB per octave low pass
82 ohm pad
39 ohm pad
24 ohm pad
20 ohm pad
20 ohm pad
20 ohm pad
15 ohm pad
15 ohm pad
15 ohm pad
5.1 ohm pad
3.5 mH (7.5 ohm DCR) shunt conjugate (mitigates 108H motional impedance in subenclosure)
24 uF & 5.1 ohm shunt conjugate (mitigates 108H reactive inductance)

7 uF 6 dB per octave high pass
0.5 mH 6 dB per octave low pass
39 ohm pad
30 ohm pad
20 ohm pad
15 ohm pad
15 ohm pad
10 ohm pad
7.5 ohm pad
3.9 ohm pad
2.7 ohm pad
3.5 mH (7.5 ohm DCR) shunt conjugate (mitigates LE5H motional impedance in subenclosure)
6 uF & 7.5 ohm shunt conjugate (mitigates LE5H reactive inductance)

3 uF 12 dB per octave high pass
0.24 mH 12 dB per octave high pass
5.1 ohm pad
5.1 ohm pad
20 ohm pad
3 uF & 7.5 ohm shunt conjugate (mitigates reactive inductance of tapped autotransformer)
0.12 mH tapped autotransformer (voltage drive taps at 0.03 mH and 0.06 mH)
1.0 mH (7.5 ohm DCR) & 14 uF shunt conjugate (mitigates motional impedance and reactive inductance of 044)

[Zonker92]

Daaaaaaaaaaaaaaaaamn. Thank you so much! I think I would skip the pads and just wire it in the 0 dB positions. I would probably skip the bypass caps, too, and upgrade the caps.

While I'm picking your brain here, if I stuck with my stock 250 drivers, instead of switching them to the 250Ti drivers, would it be a good idea to incorporate any of the 250Ti crossover revisions, and if so, which ones?

(At some point here, I'll have to decide whether to keep my 250s with the original with the LE5-11 mids and 044-1 tweeters, or upgrade them to 104Hs and 044Ti-1s.)

[roy55]

All 10watt

r1...51ohm 10w
r2...5.1
r3...5.1
r4...7.5
r5...5.1
r6...5.1
r7...20
r8...7.5
r101...82
r102...39
r103...24
r104...20
r105...20
r106...20
r107...15
r108...15
r109...15
r110...5.1
r111...39
r112...30
r113...20
r114...15
r115...15
r116...10
r117...7.5
r118...3.9
r119...2.7

[Zonker92]

Roy, you are a gentleman and a scholar. Thanks so much!

[Zonker92]

OK, I started a new thread here (http://www.audioheritage.org/vbulletin/showthread.php?31414-Any-Thoughts-on-these-Stripped-Down-L250-N250-Crossover-Drawings) on building some crossovers based on the schematic. Thanks again.