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JL 1000/1v2 rebuild
JL 1000/1v2 rebuild
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Old 25th May 2019, 05:15 PM   #21
miniman82 is offline miniman82  United States
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Is there anything you don’t know?
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Old 27th May 2019, 02:33 PM   #22
miniman82 is offline miniman82  United States
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So I got the new outputs from Mouser but figured I’d skip the 22.1’s since I have similar values around here. Tried 47r first, but the gate waveform looked sloppy and rounded to me (slow) and the FETs seemed to be getting a tad warm. So I tried 10r and it seems nice and sharp, good rise and fall times. Any reason I shouldn’t just go with10?
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Last edited by miniman82; 27th May 2019 at 02:37 PM.
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Old 2nd June 2019, 02:55 PM   #23
miniman82 is offline miniman82  United States
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Got the amp back together and working, noticed 2 things.

1. The output inductors get pretty warm after playing for about a half hour, I don’t recall that happening with the lesser slash amps so I’m asking if it’s normal

2. The filter stages don’t seem to be working, I’ve read that some of the OPAMPs can lose power through the traces in the pre card but is there anything else that’s a common fault?

Need to spray the flaky switches out too, but other than that it’s made a pretty good recovery. Thanks for all the help!
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Old 2nd June 2019, 07:12 PM   #24
Perry Babin is offline Perry Babin  United States
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If an op-amp loses it's power source, it generally goes silent.

Don't seem to be working? In what way?

I don't know about the temperature of the inductors. Obviously, if the insulating tape is melting, that's bad but what's 'hot' to the touch, isn't necessarily hot to the component.
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Old 2nd June 2019, 09:55 PM   #25
miniman82 is offline miniman82  United States
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Thanks Perry,

It’s the Q, center freq, boost and subsonic that aren’t having any effect, though sound does make it through the amp. I guess the switches could still be to blame, I’ll clean and deoxit then see what happens.
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Old 2nd June 2019, 10:50 PM   #26
Perry Babin is offline Perry Babin  United States
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The bass EQ switch defeats the boost circuit (and Q and frequency).
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