Modded my OR15

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acidvoodoo
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Modded my OR15

Post by acidvoodoo » Mon Nov 27, 2017 4:07 pm

Haven't been here in a while but figured you guys would like to see this one.

We all know the OR15 & Jim Root are essentially the same amps, with only a few different components that make them sound different. So I had my tech install a switch that allows me to toggle between the two voicings. It came out great!

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Last edited by acidvoodoo on Tue Dec 12, 2017 6:19 pm, edited 3 times in total.
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bclaire
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Re: Modded my OR15

Post by bclaire » Mon Nov 27, 2017 11:14 pm

You have to be a member of the Marshall forum to see the picture. Doesn't appear...

Sootio
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Re: Modded my OR15

Post by Sootio » Tue Nov 28, 2017 9:38 pm

What exactly are the differences and how do they affect the tone? In other words, we need a video demo.

acidvoodoo
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Re: Modded my OR15

Post by acidvoodoo » Tue Nov 28, 2017 10:11 pm

Sootio wrote:
Tue Nov 28, 2017 9:38 pm
What exactly are the differences and how do they affect the tone? In other words, we need a video demo.
Pretty simple, switch to the left OR15, switch to the right #4. Two amps in one.
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Re: Modded my OR15

Post by Sootio » Tue Nov 28, 2017 10:37 pm

That doesn't tell us much. Could just be an unconnected switch.

fiveightandten
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Re: Modded my OR15

Post by fiveightandten » Wed Nov 29, 2017 2:11 am

Sootio wrote:
Tue Nov 28, 2017 10:37 pm
That doesn't tell us much. Could just be an unconnected switch.
He likely doesn't know what the switch does, seeing as a tech did the work.

I haven't seen a #4 schematic floating around online, but it supposedly has the same pre-amp as the Rockerverb 50. If that's the case, the slope resistor and TS treble cap values are different, and the 3rd stage cathode resistor is different.
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Sootio
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Re: Modded my OR15

Post by Sootio » Wed Nov 29, 2017 10:46 am

fiveightandten wrote:
Wed Nov 29, 2017 2:11 am
Sootio wrote:
Tue Nov 28, 2017 10:37 pm
That doesn't tell us much. Could just be an unconnected switch.
He likely doesn't know what the switch does, seeing as a tech did the work.

I haven't seen a #4 schematic floating around online, but it supposedly has the same pre-amp as the Rockerverb 50. If that's the case, the slope resistor and TS treble cap values are different, and the 3rd stage cathode resistor is different.
Thanks. I've never played through a #4 and on Youtube they sound exactly like an OR15 to me, but I always figured there had to be some differences.

acidvoodoo
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Re: Modded my OR15

Post by acidvoodoo » Wed Nov 29, 2017 4:11 pm

Sootio wrote:
Tue Nov 28, 2017 10:37 pm
That doesn't tell us much. Could just be an unconnected switch.
Yes, thats exactly what I did, drilled a hole in my amp for no reason.
Image

acidvoodoo
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Re: Modded my OR15

Post by acidvoodoo » Wed Nov 29, 2017 4:15 pm

fiveightandten wrote:
Wed Nov 29, 2017 2:11 am
Sootio wrote:
Tue Nov 28, 2017 10:37 pm
That doesn't tell us much. Could just be an unconnected switch.
He likely doesn't know what the switch does, seeing as a tech did the work.

I haven't seen a #4 schematic floating around online, but it supposedly has the same pre-amp as the Rockerverb 50. If that's the case, the slope resistor and TS treble cap values are different, and the 3rd stage cathode resistor is different.
Exactly. We compared the OR15 schematic to the #4 schematic and found there are 3 components that make the OR15 and #4 sound slightly different. The switch toggles between those components.
Last edited by acidvoodoo on Wed Dec 20, 2017 6:32 pm, edited 1 time in total.
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acidvoodoo
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Re: Modded my OR15

Post by acidvoodoo » Wed Nov 29, 2017 6:46 pm

Sootio wrote:
Wed Nov 29, 2017 10:46 am
fiveightandten wrote:
Wed Nov 29, 2017 2:11 am
Sootio wrote:
Tue Nov 28, 2017 10:37 pm
That doesn't tell us much. Could just be an unconnected switch.
He likely doesn't know what the switch does, seeing as a tech did the work.

I haven't seen a #4 schematic floating around online, but it supposedly has the same pre-amp as the Rockerverb 50. If that's the case, the slope resistor and TS treble cap values are different, and the 3rd stage cathode resistor is different.
Thanks. I've never played through a #4 and on Youtube they sound exactly like an OR15 to me, but I always figured there had to be some differences.
I don't have a video of the modded OR15 yet but I do have a video that compares the tone of each amp.
https://www.youtube.com/watch?v=7iEXFY2D7M8
They sound different to me, thats why I wanted the mod done.
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Sooner
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Re: Modded my OR15

Post by Sooner » Wed Nov 29, 2017 10:41 pm

acidvoodoo wrote:
Wed Nov 29, 2017 4:11 pm
Yes, thats exactly what I did, drilled a hole in my amp for no reason.
:lol:
Sooner
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Sootio
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Re: Modded my OR15

Post by Sootio » Wed Nov 29, 2017 11:11 pm

acidvoodoo wrote:
Wed Nov 29, 2017 4:11 pm
Sootio wrote:
Tue Nov 28, 2017 10:37 pm
That doesn't tell us much. Could just be an unconnected switch.
Yes, thats exactly what I did, drilled a hole in my amp for no reason.
You wouldn't be the first. :) It's your amp and if your getting something out of it, that's all that matters.

pedecamp
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Re: Modded my OR15

Post by pedecamp » Wed Dec 13, 2017 2:21 pm

acidvoodoo wrote:
Wed Nov 29, 2017 6:46 pm
Sootio wrote:
Wed Nov 29, 2017 10:46 am
fiveightandten wrote:
Wed Nov 29, 2017 2:11 am
He likely doesn't know what the switch does, seeing as a tech did the work.

I haven't seen a #4 schematic floating around online, but it supposedly has the same pre-amp as the Rockerverb 50. If that's the case, the slope resistor and TS treble cap values are different, and the 3rd stage cathode resistor is different.
Thanks. I've never played through a #4 and on Youtube they sound exactly like an OR15 to me, but I always figured there had to be some differences.
I don't have a video of the modded OR15 yet but I do have a video that compares the tone of each amp.
https://www.youtube.com/watch?v=7iEXFY2D7M8
They sound different to me, thats why I wanted the mod done.
Good video! I definitely hear a difference, I think I like the OR15 and its open tone, the #4 sounds more compressed and modern. If I had both I think I'd get an AB switch and run them both, one clean the other dirty, or one rhythm the other lead. Cool amps!
Thunderverb 50
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acidvoodoo
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Re: Modded my OR15

Post by acidvoodoo » Thu Dec 14, 2017 4:05 pm

pedecamp wrote:
Wed Dec 13, 2017 2:21 pm
Good video! I definitely hear a difference, I think I like the OR15 and its open tone, the #4 sounds more compressed and modern. If I had both I think I'd get an AB switch and run them both, one clean the other dirty, or one rhythm the other lead. Cool amps!
Thanks man! To me "open or wide" better describes the #4 in the room...I tried to capture the tone difference in this short clip I recorded last night. It was recorded on an iPhone so probably sounds best listening through one. Let me know what you think. https://www.youtube.com/watch?v=5MJ-MCF1FnI
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pedecamp
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Re: Modded my OR15

Post by pedecamp » Mon Dec 18, 2017 4:41 pm

acidvoodoo wrote:
Thu Dec 14, 2017 4:05 pm
pedecamp wrote:
Wed Dec 13, 2017 2:21 pm
Good video! I definitely hear a difference, I think I like the OR15 and its open tone, the #4 sounds more compressed and modern. If I had both I think I'd get an AB switch and run them both, one clean the other dirty, or one rhythm the other lead. Cool amps!
Thanks man! To me "open or wide" better describes the #4 in the room...I tried to capture the tone difference in this short clip I recorded last night. It was recorded on an iPhone so probably sounds best listening through one. Let me know what you think. https://www.youtube.com/watch?v=5MJ-MCF1FnI
I couldn't tell any difference through youtube, I don't have an iPhone.
Thunderverb 50
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