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

Hi @santiall , I recently bought a used JVM 410HJS in excellent condition. I love the quality of this amp. One question I have is about the clean channel in green mode. My understanding is the channel volume pot for that channel does not apply for the green mode. When the gain is set around 12 o'clock, master volume at 3 o'clock, I noticed a light but still noticeable static noise in the green mode (changes in level with the gain setting), but as soon as I switch to orange mode (channel volume at 3), that base noise is gone at the same gain setting. If the channel volume is at 12 o'clock, their noise levels are similar. Not sure if this is normal/expected. The amp is connected to an 4x12 1960A.
 
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lofe said:
Hi @santiall , I recently bought a used JVM 410HJS in excellent condition. I love the quality of this amp. One question I have is about the clean channel in green mode. My understanding is the channel volume pot for that channel does not apply for the green mode. When the gain is set around 12 o'clock, master volume at 3 o'clock, I noticed a light but still noticeable static noise in the green mode (changes in level with the gain setting), but as soon as I switch to orange mode (channel volume at 3), that base noise is gone at the same gain setting. If the channel volume is at 12 o'clock, their noise levels are similar. Not sure if this is normal/expected. The amp is connected to an 4x12 1960A.
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Hi, I wouldn't worry too much. Since that mode doesn't have the volume active all th enoise that might be generated in the preamp will pass through withough being attenuated by the channel volume. Master at 3 is VERY loud too.
You may want to try a different input tube to see if that improves, if it bothers you of course.
 
santiall said:
Hi, I wouldn't worry too much. Since that mode doesn't have the volume active all th enoise that might be generated in the preamp will pass through withough being attenuated by the channel volume. Master at 3 is VERY loud too.
You may want to try a different input tube to see if that improves, if it bothers you of course.
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Thank you so much for confirming. It doesn't bother me, just wanted to understand the different behavior between the modes. It's an amazing amp, really love it. I feel so fortunate to own one.
 
lofe said:
Thank you so much for confirming. It doesn't bother me, just wanted to understand the different behavior between the modes. It's an amazing amp, really love it. I feel so fortunate to own one.
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all good then (y).
There are not so many HJS available out there,have fun!
 
santiall said:
Hi, first thing to suspect in any tube amp is the tubes.
Do you know if the noise depends on the volume/tone controls of one of the channels only?
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It doesn’t. It only has static when a guitar cable is plugged into a jack. It doesn’t matter which of the 4 (2 clean & 2 reverb jacks). I’ve changed guitar cables and guitars. I’ve run straight from my guitar to the amp bypassing my pedal board. I’ve zeroed out tone and volume controls. I checked speaker connections and the jack from the speaker to the cabinet back. I’m not sure how to check the tubes to be sure they’re seated correctly. None seem loose to me. Still the same.
 
Flman said:
It doesn’t. It only has static when a guitar cable is plugged into a jack. It doesn’t matter which of the 4 (2 clean & 2 reverb jacks). I’ve changed guitar cables and guitars. I’ve run straight from my guitar to the amp bypassing my pedal board. I’ve zeroed out tone and volume controls. I checked speaker connections and the jack from the speaker to the cabinet back. I’m not sure how to check the tubes to be sure they’re seated correctly. None seem loose to me. Still the same.
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hmm, now that's interesting. Everything would point to a faulty cable... having the cable connected to a guitar with the volume at zero should be the same as not having the cable connected to the input at all. It should be a shorcircuit from signal to ground.
If you want you can record a short video with your setup and send me the link. I'm curious to see what's actually happening
 
Hi Santiago,
I love the sound of the AFD100 Slash signature amp in the launch video, with its great dynamics and that great scoop in the mids. 😁
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I've searched the forum but haven't found the answers to some big questions I have:
What speakers were ultimately used in that video and on the 2011 tour? (Vintage 30 / Greenback / Heritage / other)
And what tubes are installed in the model used by Slash (6550GT and ECC83S)?
Thanks @santiall for this amp! 🤟
 
lucertola said:
Hi Santiago,
I love the sound of the AFD100 Slash signature amp in the launch video, with its great dynamics and that great scoop in the mids. 😁
After 0:20
extract video
I've searched the forum but haven't found the answers to some big questions I have:
What speakers were ultimately used in that video and on the 2011 tour? (Vintage 30 / Greenback / Heritage / other)
And what tubes are installed in the model used by Slash (6550GT and ECC83S)?
Thanks @santiall for this amp! 🤟
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Hi, thank you for the message!
tubes... I don't remember the exact types but the 6550 were most likely Russian, probably Svetlana/SED, and the ECC83 most likely a blend of Shuguangs and JJs. It's been too many years to remember those details....
The speakers are 100% Vintage 30, Slash was playing only V30s by then.
 
Do you have any clue why whenever I import NAM files, they sound nothing like they're supposed to, I only have an IR input slot, but from everything else that I've read it should do the same exact thing as long as it's a nam file, I use the Sonicake pocket master btw
 
Oblivion said:
Do you have any clue why whenever I import NAM files, they sound nothing like they're supposed to, I only have an IR input slot, but from everything else that I've read it should do the same exact thing as long as it's a nam file, I use the Sonicake pocket master btw
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Hi, I am not familiar at all with the device but what the manual says is that you should load the NAM file into the amp module, changing it to 'clone', not sure loading it in the IR slot would work...
 
santiall said:
Hi, I am not familiar at all with the device but what the manual says is that you should load the NAM file into the amp module, changing it to 'clone', not sure loading it in the IR slot would work...
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santiall said:
I somehow managed to mess this thing up to say that you said what I'm saying.
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santiall said:
thanks for your time, I got it to work. and btw, sorry to bother you more lol, but do you know what kind of amp/ pedals A7X uses, I'm trying to get the "this means war" tone/sound, and Im not able to figure out what amp, setup, pedals/ delay/reverb/ir/ cabinet, and all the other stuff they use to get that sound, I could be overthinking it lol. Also, should I save up for the neural DSP tim henson archetype, or should I get I different plugin? I'm trying to get a unique tone for my band
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Hi, yes, you are probably overthinking haha... I'm not too familiar with A7X myself, I know that they used JVMs several years ago but I think a 5150 or a boosted Rectifier with V30 speakers will get you in the ballpark.
Plugins... I can't advice there, just try them and try to find what you actually like and feel comfortable with!
 
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