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April 15, 2021, 12:25:59 AM

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1
Schematics and Layouts / Re: Roland JC-40 Schematic
« Last post by g1 on April 14, 2021, 12:06:30 PM »
Sure.  Thanks for bumping the limit.   :)
2
Amplifier Discussion / The Sunn Solos II
« Last post by Pepe on April 14, 2021, 09:13:02 AM »
Has anyone tried one of these amps? I found one listed for $500 in my town and I absolutely love sunn amps, not so big on the inflated prices though..
3
Amplifier Discussion / Re: Ampeg SS-150H cutting out
« Last post by Pepe on April 14, 2021, 09:08:20 AM »
"Dirt" in the jacks does not refer to visual grunge, it refers to electrical dirt.  Contact surfaces oxidize or build up a film of foreign matter.  This happens to ANY amp of ANY brand that has FX loop jacks.

You need to clean the cutout contacts, not just the parts a plug touches.

You were right, I cleaned out every jack with a touch of de-oxit and a q tip. Works without issue. Thanks man.
4
Schematics and Layouts / Re: Roland JC-40 Schematic
« Last post by joecool85 on April 13, 2021, 04:29:51 PM »
I don't have the schematic, but would also love to see one.  This is a neat amp!

Tried to upload, but it's about half a meg bigger than the 5Mb limit.  If you want to bump the limit, I will attach.   :)

edit: nevermind, zipped

If you'd like to share it unzipped, I've adjusted the limited from 5mb to 7.5mb.
5
Schematics and Layouts / Re: Roland JC-40 Schematic
« Last post by willpirkle on April 12, 2021, 07:44:40 PM »
Thanks! This is great - I didn’t know it was a digital modeling amp.
6
Schematics and Layouts / Re: Roland JC-40 Schematic
« Last post by g1 on April 12, 2021, 02:42:53 PM »
I don't have the schematic, but would also love to see one.  This is a neat amp!

Tried to upload, but it's about half a meg bigger than the 5Mb limit.  If you want to bump the limit, I will attach.   :)

edit: nevermind, zipped
7
Schematics and Layouts / Re: Roland JC-40 Schematic
« Last post by joecool85 on April 12, 2021, 09:01:21 AM »
I don't have the schematic, but would also love to see one.  This is a neat amp!
8
Amplifier Discussion / Re: Ampeg SS-150H cutting out
« Last post by Enzo on April 11, 2021, 11:31:31 PM »
"Dirt" in the jacks does not refer to visual grunge, it refers to electrical dirt.  Contact surfaces oxidize or build up a film of foreign matter.  This happens to ANY amp of ANY brand that has FX loop jacks.

You need to clean the cutout contacts, not just the parts a plug touches.
9
Amplifier Discussion / Re: Ampeg SS-150H cutting out
« Last post by Pepe on April 11, 2021, 08:46:49 PM »
I tried the cable jump method and it seems to work okay, channel a is good and channel b seems a little off but is doable. What causes this issue?

I assume this means you are placing a cable connecting the effects loop in and outs. Dirt, corrosion and worn out metal switching contacts are all possible reasons for the cutting out. But I don't see effects loop on the schematic so I am not sure if this is what you meant.

Yeah that's pretty much what I did

If the audio cuts out like clock work then it is always possible there is a cold solder joint. I would then input a test signal into the amp and when it cuts out I would scope or trace the signal in the amp. I would confirm preamp and power amp voltage while it is working and after it cuts out.

It's not always on time, but it happens within that time frame. I'll try that out and see what pops up.
10
Amplifier Discussion / Re: Ampeg SS-150H cutting out
« Last post by Pepe on April 11, 2021, 08:39:07 PM »
There should be an FX loop on the rear.  Lower right corner.  Just below the FS jack.

If patching a cord across the FX loop restores the sound, then your return jack needs service.

Considering how dusty and unused it seems to be, I would assume it just needs a thorough cleaning. Since this is my first ampeg, Im not sure how these amps behave when they become dirty (if that would have any effect at all on these amps).
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