Serviceability of the VHX in the future?

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C0UNT3RP01NT

C0UNT3RP01NT

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Hey!

So I've had the VHX for awhile now, and it's a fantastic amp. No complaints about how it sounds or works.

However, I'm also pretty young, in my mid 20's. I had a stroke of financial luck and the VHX became my first entry into the boutique amp world. I was having a conversation with an older gentlemen at a bar last night whom also played guitar, and on the subject of amps, he mentioned that he had a Marshall Superlead that he had bought in the 70's. He had it serviced a few times, but he still had it and still loved playing it. Whenever I visit my father, I play on a 1960's Super Reverb that my dad had bought sometime in the 70's or 80's. That amp has also been serviced a few times, and still plays great. My point here is that these amps have lasted 50 years with maintenance.

I've had a few conversations on different forums, with guitarists whom think the VHX looks like a great amp but they're concerned about the digital elements of the amp. I believe there was a post on here once with similar concerns and Peter said something to the effect that Diezel has been providing great customer support for the last 25 years and they don't plan on stopping. The customer service is amazing, but I would like to know more about the serviceability of the VHX in the event that Diezel is unable to provide that level of support anymore?

I understand the amp is analog with a digital section. The signal is analog through the preamp is converted to digital before the loop and is then converted back to analog through the power amp. Please correct me if I'm wrong. My questions are as follows:
  • How easy is it to replace the digital components?
  • Is it propietary digital hardware, or can generic replacements be ordered (that you can upload the firmware to)?
  • If there's an issue with the amp, how would I determine whether it's caused by the digital hardware/software vs the analog components?
  • How do the digital components affect the serviceability of the analog components? I assume switching the voice or shape changes the signal path, but are these analog switches controlled by the digital "brain", or are these switches a part of the digital brain?
  • How easy is it to service this amp in general? Can a regular amp tech take care of these issues, or is it something to be mailed off to a specialist. I do a lot of electrical engineering work for my job (though I'm a different kind of engineer). Can I repair this amp with a schematic and a components list? Or are there specific repairs that can only be completed by those with access to restricted company information.
  • Mods? I don't really see a need for them honestly, but if for some reason I wanted to change a cap or resistor is that going to mess with how the amp changes the voicings?
I'm not really worried about now, or the near future, but amps can have a lifespan beyond the designers and their companies. This is usually fine as the serviceability of analog amps are not tied to the company that built them. The digital parts of this amp complicate that. I sincerely hope Diezel as a company continues to prosper into the future, but considering the cost of the VHX, my age, and the chance that I could keep this amp for a very, very long time, I do have some concern that there could be a future where this amp breaks and I won't have any way to fix it.

I understand there might be some propietary trade secrets that I'm asking about, it's not my intention to get you to divulge anything like that. This might have been discussed in detail somewhere else, and I missed it, so my apologies if that's the case. I don’t mean to come off as ignorant regarding the design of the amp. Like I said I think it's a great amp, I was just looking for some more concrete details on how to service the VHX in general?

Thanks!

- C
 
Last edited:
Regarding your first two points:

It’s not the most detailed pic without opening mine up but this review https://www.gitarrebass.de/equipment/test-diezel-amplification-vhx/ has a Birds Eye view of the internals. Does not look unnecessarily complex, though I cannot see the DSP chipset used — but, whatever it is, it’s on a custom designed board, so it most likely wouldn’t be some off the shelf purchase and replace/upload firmware. I’m not saying I’m correct, that’s just my opinion based on what I see.
 
Hey!

So I've had the VHX for awhile now, and it's a fantastic amp. No complaints about how it sounds or works.

However, I'm also pretty young, in my mid 20's. I had a stroke of financial luck and the VHX became my first entry into the boutique amp world. I was having a conversation with an older gentlemen at a bar last night whom also played guitar, and on the subject of amps, he mentioned that he had a Marshall Superlead that he had bought in the 70's. He had it serviced a few times, but he still had it and still loved playing it. Whenever I visit my father, I play on a 1960's Super Reverb that my dad had bought sometime in the 70's or 80's. That amp has also been serviced a few times, and still plays great. My point here is that these amps have lasted 50 years with maintenance.

I've had a few conversations on different forums, with guitarists whom think the VHX looks like a great amp but they're concerned about the digital elements of the amp. I believe there was a post on here once with similar concerns and Peter said something to the effect that Diezel has been providing great customer support for the last 25 years and they don't plan on stopping. The customer service is amazing, but I would like to know more about the serviceability of the VHX in the event that Diezel is unable to provide that level of support anymore?

I understand the amp is analog with a digital section. The signal is analog through the preamp is converted to digital before the loop and is then converted back to analog through the power amp. Please correct me if I'm wrong. My questions are as follows:
  • How easy is it to replace the digital components?
  • Is it propietary digital hardware, or can generic replacements be ordered (that you can upload the firmware to)?
  • If there's an issue with the amp, how would I determine whether it's caused by the digital hardware/software vs the analog components?
  • How do the digital components affect the serviceability of the analog components? I assume switching the voice or shape changes the signal path, but are these analog switches controlled by the digital "brain", or are these switches a part of the digital brain?
  • How easy is it to service this amp in general? Can a regular amp tech take care of these issues, or is it something to be mailed off to a specialist. I do a lot of electrical engineering work for my job (though I'm a different kind of engineer). Can I repair this amp with a schematic and a components list? Or are there specific repairs that can only be completed by those with access to restricted company information.
  • Mods? I don't really see a need for them honestly, but if for some reason I wanted to change a cap or resistor is that going to mess with how the amp changes the voicings?
I'm not really worried about now, or the near future, but amps can have a lifespan beyond the designers and their companies. This is usually fine as the serviceability of analog amps are not tied to the company that built them. The digital parts of this amp complicate that. I sincerely hope Diezel as a company continues to prosper into the future, but considering the cost of the VHX, my age, and the chance that I could keep this amp for a very, very long time, I do have some concern that there could be a future where this amp breaks and I won't have any way to fix it.

I understand there might be some propietary trade secrets that I'm asking about, it's not my intention to get you to divulge anything like that. This might have been discussed in detail somewhere else, and I missed it, so my apologies if that's the case. I don’t mean to come off as ignorant regarding the design of the amp. Like I said I think it's a great amp, I was just looking for some more concrete details on how to service the VHX in general?

Thanks!

- C
The design is made with split boards so the digital part is completely separated (one small board on the back and one on the front) and very easy to be replaced, as that would be the preferred way to fix any possible issue.

However just for your information:
  • How easy is it to replace the digital components?
    -Digital components are standard sized SMD, smallest component is 0603 resistors. The main IC is a 0.5mm LQFP, and was choosen exactly for this purpose, no BGA components are used.
  • Is it propietary digital hardware, or can generic replacements be ordered (that you can upload the firmware to)?
    -No proprietary hardware used, all components are industry standard and can be easily sourced from almost any electronic distributor even in 1 pcs quantity
  • If there's an issue with the amp, how would I determine whether it's caused by the digital hardware/software vs the analog components?
    -You would proceed as usual when no obvious clue is there, oscilloscope following the signal, the DSP side has inputs and outputs and everyting analog is controlled by relays.
  • How easy is it to service this amp in general? Can a regular amp tech take care of these issues, or is it something to be mailed off to a specialist. I do a lot of electrical engineering work for my job (though I'm a different kind of engineer). Can I repair this amp with a schematic and a components list? Or are there specific repairs that can only be completed by those with access to restricted company information.
    -In the worst case scenario (Main IC replacement) it would need to be reprogrammed with the bootloader. Bootloader and schematic are easy to get by any repair shop who has a real need but not really publicy available, while firmware is already publicy available. The programmer is a standard programmer and easily found on any electronic shop.
  • Mods? I don't really see a need for them honestly, but if for some reason I wanted to change a cap or resistor is that going to mess with how the amp changes the voicings?
    -The analog part is just like a regular Diezel, so if you are familiar with the circuit you can MOD it just as easily if you want/have to!
Thank you,
Leo
 
The design is made with split boards so the digital part is completely separated (one small board on the back and one on the front) and very easy to be replaced, as that would be the preferred way to fix any possible issue.

However just for your information:
  • How easy is it to replace the digital components?
    -Digital components are standard sized SMD, smallest component is 0603 resistors. The main IC is a 0.5mm LQFP, and was choosen exactly for this purpose, no BGA components are used.
  • Is it propietary digital hardware, or can generic replacements be ordered (that you can upload the firmware to)?
    -No proprietary hardware used, all components are industry standard and can be easily sourced from almost any electronic distributor even in 1 pcs quantity
  • If there's an issue with the amp, how would I determine whether it's caused by the digital hardware/software vs the analog components?
    -You would proceed as usual when no obvious clue is there, oscilloscope following the signal, the DSP side has inputs and outputs and everyting analog is controlled by relays.
  • How easy is it to service this amp in general? Can a regular amp tech take care of these issues, or is it something to be mailed off to a specialist. I do a lot of electrical engineering work for my job (though I'm a different kind of engineer). Can I repair this amp with a schematic and a components list? Or are there specific repairs that can only be completed by those with access to restricted company information.
    -In the worst case scenario (Main IC replacement) it would need to be reprogrammed with the bootloader. Bootloader and schematic are easy to get by any repair shop who has a real need but not really publicy available, while firmware is already publicy available. The programmer is a standard programmer and easily found on any electronic shop.
  • Mods? I don't really see a need for them honestly, but if for some reason I wanted to change a cap or resistor is that going to mess with how the amp changes the voicings?
    -The analog part is just like a regular Diezel, so if you are familiar with the circuit you can MOD it just as easily if you want/have to!
Thank you,
Leo
Fan-fucking-tastic

🤌 Chefs kiss! Well done! Bravo! Amazing job! Brilliant engineering!

I’m very happy to support you all, but I just wanted to know that if in the event something were to happen to the company, would I be screwed if my amp broke?

You really should get this information more out there. I read the owners manual and the service manual, and I didn’t see anything on the VHX. I know from several conversations I’ve had and seen is that a number of people are afraid of the amp breaking and being unable to repair it. You definitely removed any hesitancy I’ve had in keeping the amp.

If I’m understanding this correctly, basically everything on this amp can be just as easily sourced and replaced as an entirely analog amp?
 
The design is made with split boards so the digital part is completely separated (one small board on the back and one on the front) and very easy to be replaced, as that would be the preferred way to fix any possible issue.

However just for your information:
  • How easy is it to replace the digital components?
    -Digital components are standard sized SMD, smallest component is 0603 resistors. The main IC is a 0.5mm LQFP, and was choosen exactly for this purpose, no BGA components are used.
Thank you,
Leo
Ooh, no BGA? I was not expecting that answer. Very nice, I like the choices you guys made for this amp.
 
The design is made with split boards so the digital part is completely separated (one small board on the back and one on the front) and very easy to be replaced, as that would be the preferred way to fix any possible issue.

However just for your information:
  • How easy is it to replace the digital components?
    -Digital components are standard sized SMD, smallest component is 0603 resistors. The main IC is a 0.5mm LQFP, and was choosen exactly for this purpose, no BGA components are used.
  • Is it propietary digital hardware, or can generic replacements be ordered (that you can upload the firmware to)?
    -No proprietary hardware used, all components are industry standard and can be easily sourced from almost any electronic distributor even in 1 pcs quantity
  • If there's an issue with the amp, how would I determine whether it's caused by the digital hardware/software vs the analog components?
    -You would proceed as usual when no obvious clue is there, oscilloscope following the signal, the DSP side has inputs and outputs and everyting analog is controlled by relays.
  • How easy is it to service this amp in general? Can a regular amp tech take care of these issues, or is it something to be mailed off to a specialist. I do a lot of electrical engineering work for my job (though I'm a different kind of engineer). Can I repair this amp with a schematic and a components list? Or are there specific repairs that can only be completed by those with access to restricted company information.
    -In the worst case scenario (Main IC replacement) it would need to be reprogrammed with the bootloader. Bootloader and schematic are easy to get by any repair shop who has a real need but not really publicy available, while firmware is already publicy available. The programmer is a standard programmer and easily found on any electronic shop.
  • Mods? I don't really see a need for them honestly, but if for some reason I wanted to change a cap or resistor is that going to mess with how the amp changes the voicings?
    -The analog part is just like a regular Diezel, so if you are familiar with the circuit you can MOD it just as easily if you want/have to!
Thank you,
Leo
This is an absolutely brilliant design: that something this progressive design-wise, is totally serviceable down to every component!
That means an amp that can last a really long time...maybe a lifetime.
This amp just keeps getting better and better!
 
I own a Soldano X99 preamp, also built along the concept of separate sections, with an analog tone circuit part and a midi part controlling the motorized pots. That thing is just as good as it was in the early 90s. The Diezel VHX design looks like it's built along the same philosophy
 
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