Santiago Alvarez (electronics engineer, JVM, YJM, AFD...)

Pablo González Kettenhofe said:
Hola @santiall

Thank you very much for your reply.

I can imagine that it is hard to design a combo and make it sound big with adicional restrictions of the layout.

I can tell you that I really enjoy playing both the combo and the head.

I saw the video with León Todd and it was really interesting about how you started and also your dad supporting you.

Also the fact that the first JVM prototype had more gain!

I have 3 more questions if your don't mind:

How would you define the OD1 and OD2 orange and red? Maybe a JCM800 on esteroids?

You mentioned on the interview that you got a mark V and fixed. I currently live in México and it is not easy get one oor try one. How do you like it and how would you compare the sound to the JVM? I know these are different animals but I have to ask.

Which do you like the most Dual Rectifier or Mark V?

Muchas gracias Santiago!
Click to expand...
Hi Pablo,

OD1, OD2... it is a modified 2203. You may say it is a JCM800 on steroids, yeah

I like the Mark IV and Mark V a lot, they are tricky to dial in but you can get great tones out of them. I haven't tried the Mk VII yet so I don't have a reference on that one. I don't think you can't really compare these to a JVM, the JVM is "similar" to a Rectifier, 5150, Bogners... that would be a fairer comparisson I guess.

On the other hand I am not a big fan of the Dual Rectifiers, it is an amp that I wanted to like but just didn't do it for me or for the type of music I try to play. I have one Roadster combo that use as reference sometimes but it doesn't inspire me. I would take a 5150 any time over a Rectifier.

cheers!
 
santiall said:
the settings look good. I'd try connecting the whole system step by step. First the effects in front of the amp only, then the effects in the loop only (with the guitar connected directly to the amp input), then everything together. You'll be able to know where the losses start to appear.

Also make sure that you don't have any strange/unwanted routing in the HX so the 'front' and 'rear' signals are completely isolated.

With your setup it should be pretty much the same to use either loop and, actually, you also could use the SEND from the programmable loop and then return into the Power amp IN return. You'll bypass the loops and the reverb, probably a little bit quieter.
Click to expand...

I spent an afternoon playing around with this at volume and found connecting my stomp in the serial loop with a buffer is working well for me.

Thanks Santiago
 
Hello Santiall,
I Really like your Informations. Thankss a lot. I read all your Posts here.

So my questions:

Do you habe Any advices for modding of the jvm 410? Im an Electrician an thinking about it.
Whats your opinion on the c83 mod for example?

Do you have any advices for tweaking the JVM?

Overall i like The jvm but i want to get More of an hot Rod plexi out of it.
 
Sorxes said:
Hello Santiall,
I Really like your Informations. Thankss a lot. I read all your Posts here.

So my questions:

Do you habe Any advices for modding of the jvm 410? Im an Electrician an thinking about it.
Whats your opinion on the c83 mod for example?

Do you have any advices for tweaking the JVM?

Overall i like The jvm but i want to get More of an hot Rod plexi out of it.
Click to expand...
Hi, JVM mods... some time ago there was a lot of activity about those in the JVM forum. That forum died and I am not sure if the info is collected somewhere else, perhaps in the Facebook group. I seldom advise on those as it is quite a personal decision, I mean what would you want to achieve, more gain, less gain, more bottom end... it also depends a lot on what you play, what guitar(s) you use and so on...

C83 was probably the only mod I proposed :D, it was many many years ago when someone approached me to make the amp less moder, loser, more classic in a way. It'll reduce the gain and make the whole amp 'softer' if that makes sense and I'd not recommend it for more of a Plexi sound.

As per what I read over the years, probably the preferred mods where changing the power amp feedback (it gives more gain to the power amp and slighly less bass and highs) and some people liked lowering the gain. Bear in mind that modifying the preamplifier side probably affects more than one mode so you may end with some channels/modes that aren't that useful anymore.

Another popular mod was to make it more like a plexi, probably what you look after. I'd suggest to search for "JVM plexi mod" or JVM plexi cap mod
 
Question for you do you still work for Marshall?
Would you ever consider working @ Mesa Engineering > (Now Gibson)
 
Stone said:
Question for you do you still work for Marshall?
Would you ever consider working @ Mesa Engineering > (Now Gibson)
Click to expand...
Hi, no, I'm not working for Marshall anymore for several months. I rejoined for a while in 2020, then I went back to work on my own projects and doing consultancy for a few other companies.

I'd love to design something for Mesa, just don't know who to approach... I am fan since the 90s but way too expensive already back then. You know, in those days in Spain just knowing someone who had a Boggie made you feel important haha.

When I decided that I wanted to work in the audio business I sent my CV to them, year 1999 or 2000 must be. They replied pretty much saying that they were small and there were no openings but they took the time to write back, many other companies don't even reply to say thanks...
 
santiall said:
Hi, JVM mods... some time ago there was a lot of activity about those in the JVM forum. That forum died and I am not sure if the info is collected somewhere else, perhaps in the Facebook group. I seldom advise on those as it is quite a personal decision, I mean what would you want to achieve, more gain, less gain, more bottom end... it also depends a lot on what you play, what guitar(s) you use and so on...

C83 was probably the only mod I proposed :D, it was many many years ago when someone approached me to make the amp less moder, loser, more classic in a way. It'll reduce the gain and make the whole amp 'softer' if that makes sense and I'd not recommend it for more of a Plexi sound.

As per what I read over the years, probably the preferred mods where changing the power amp feedback (it gives more gain to the power amp and slighly less bass and highs) and some people liked lowering the gain. Bear in mind that modifying the preamplifier side probably affects more than one mode so you may end with some channels/modes that aren't that useful anymore.

Another popular mod was to make it more like a plexi, probably what you look after. I'd suggest to search for "JVM plexi mod" or JVM plexi cap mod
Click to expand...
Thanks a lot Santiago.


Maybe ill try Plexi mod. I really appreciate your help.



As i am from Germany, i found Some „Modders“ Here in Germany.

One of them is „Erhan Mann“ Form Session in Frankfurt. He Makes the „Oli-Mod“. You Made a Video With them some time ago to show the Kong amp.

Do you Know The Oli Mod ? If yes what you Think about it ?

Thanks again !!!
 
Sorxes said:
Thanks a lot Santiago.


Maybe ill try Plexi mod. I really appreciate your help.



As i am from Germany, i found Some „Modders“ Here in Germany.

One of them is „Erhan Mann“ Form Session in Frankfurt. He Makes the „Oli-Mod“. You Made a Video With them some time ago to show the Kong amp.

Do you Know The Oli Mod ? If yes what you Think about it ?

Thanks again !!!
Click to expand...
you are more than welcome :)
I just asked Erhan, the "oli-mod' is what you hear in the Session's videos. As per what he told me it is a bit of everything, power amp feedback, probably some sort of 'plexi mod' in the cruch channel and general overhaul here and there. I haven't played that amp but in the videos it sounds open and crisp, a bit treblier than the original but cuts nicely in the mix.
I'd say just get in touch with them and see what can be done :)
 
Hello Hello Santiall, hope all is well, Seeing that you are an Engineer
Was wondering what your take is on these devices
you see my home has very dirty electricity and I get a lot of noise
My first component is where all my music and computer gear is connected
The ART Pro PS4x4 USB

1693148345020.png


I was wondering if adding this unit will further reduce the dirty AC in my environment?

​

1693148421918.png

​

Thank you for your valued input ​

​

​

 
santiall said:
Hi, no, I'm not working for Marshall anymore for several months. I rejoined for a while in 2020, then I went back to work on my own projects and doing consultancy for a few other companies.

I'd love to design something for Mesa, just don't know who to approach... I am fan since the 90s but way too expensive already back then. You know, in those days in Spain just knowing someone who had a Boggie made you feel important haha.

When I decided that I wanted to work in the audio business I sent my CV to them, year 1999 or 2000 must be. They replied pretty much saying that they were small and there were no openings but they took the time to write back, many other companies don't even reply to say thanks...
Click to expand...
I already feel important having written communication with the man who dessigned a modern classic. Thanks Santiago!
 
Stone said:
Hello Hello Santiall, hope all is well, Seeing that you are an Engineer
Was wondering what your take is on these devices
you see my home has very dirty electricity and I get a lot of noise
My first component is where all my music and computer gear is connected
The ART Pro PS4x4 USB

View attachment 10321

I was wondering if adding this unit will further reduce the dirty AC in my environment?

​

View attachment 10322​

​

Thank you for your valued input ​

​

​

Click to expand...
Hi, I'm not sure that extra filtering will help you much but I have zero experience to give you a proper opion...
what sort of noises/issues you have with your mains?. Sometimes the problem isn't the mains itself but the grounding. Also, not all devices react in the same way to "dirty mains". Perhaps it is worth for you to find out which equipment is sensitive and just concentrate on that particular one.
 
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