LAST VALVE SOUND SIMULATOR

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LAST VALVE SOUND SIMULATOR

Postby rcustoms » 08 Jul 2015, 06:20

last valve sound simulator ,is a complete project found in the last everyday practical electronics magazine -august 2015
nirvana.jpg

this is the link
http://kat.cr/everyday-practical-electr ... ent?title=[kat.cr]everyday.practical.electronics.august.2015
realy awesome project
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Re: LAST VALVE SOUND SIMULATOR

Postby DrNomis » 08 Jul 2015, 09:11

Cheers for that Rcustoms..... :thumbsup

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Re: LAST VALVE SOUND SIMULATOR

Postby nickthemen » 08 Jul 2015, 10:30


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Re: LAST VALVE SOUND SIMULATOR

Postby phatt » 08 Jul 2015, 15:06

Thanks chaps, I read the artical,, Hum??
Someone may have more understanding of these things but to me that is just a fancy name for a tone control and frankly a tone control with only 3 or 4 dB of boost or cut is not something that would bother to build. Heck,,even an average parq Eq would make a bigger impression. :blackeye
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Re: LAST VALVE SOUND SIMULATOR

Postby Dirk_Hendrik » 09 Jul 2015, 18:45

After a quick glance over the article I wondered why they did so much "right" ands then resorted to the use of 1/8" mini-jacks :?
Sorry. Plain out of planes.

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Re: LAST VALVE SOUND SIMULATOR

Postby Ice-9 » 09 Jul 2015, 21:29

Well my isp has blocked this page due to a UK court order :(
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
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Re: LAST VALVE SOUND SIMULATOR

Postby bajaman » 10 Jul 2015, 01:59

check your email Mick :D
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Re: LAST VALVE SOUND SIMULATOR

Postby tabbycat » 10 Jul 2015, 06:51

if it's a good project and worth something to you, as this is the current edition of the mag you may want to consider buying it online for the price of a drink or two.
show your support for the writers and keep a good publication running.

http://www.epemag.com/

obviously if you are livng on no money at all in china, india, etc, then this is not an option and using free downloads to educate yourself is a different matter.
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Re: LAST VALVE SOUND SIMULATOR

Postby Ice-9 » 10 Jul 2015, 19:16

tabbycat wrote:if it's a good project and worth something to you, as this is the current edition of the mag you may want to consider buying it online for the price of a drink or two.
show your support for the writers and keep a good publication running.

http://www.epemag.com/

obviously if you are livng on no money at all in china, india, etc, then this is not an option and using free downloads to educate yourself is a different matter.


Good idea, but I was only wanting a look, still the mag could have some other interesting stuff in it so could always be worth a buy :secret:
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
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Re: LAST VALVE SOUND SIMULATOR

Postby teemuk » 12 Jul 2015, 12:37

phatt wrote:Someone may have more understanding of these things but to me that is just a fancy name for a tone control and frankly a tone control with only 3 or 4 dB of boost or cut is not something that would bother to build. Heck,,even an average parq Eq would make a bigger impression


I have to agree.

Considering all the "packaging" and "marketing" involved this project is a big dissapointment.

Looking at it, it's really just a simple "waveshaper" coupled to some EQ'ing. Yes, it does recognize two of characteristics, which would be considered important ingredienmts of "tube sound" today. These would be amplitude/intermodulation distortion and non-linear frequency response due to weaker damping factor.

It's just how these issues are addressed that is terribly lacking. Yes, you will get soft distortion from an overdriven JFET but such non-linear "waveshaper" is not really going to capture all the interaction and dynamics of a typical MULTI-STAGE tube amplifier, which cascades several waveshapers.

So for "tube distortion" part this ends up being just an overdriven source follower amp. Okay. Look at just about any GUITAR AMP schematic and you'll find examples of much more ambitious and realistic schemes to fake tube amplifier's amplitude distortions. Compared to stuff employed in Peavey's TransTube amps, Crate amps, AMT pedals, Prithard amps, Quilter amps, etc. this "tube emulation" looks like a joke. If "distorting" is your only criteria for this performance, then I'll guess you'll be happy with it, though.

The other part is that EQ. Yes, tube amps with poor damping will "reflect" the impedance of the load in their frequency response since their gain changes in interaction with loading impedance. This is a recogniseable characteristic but in the end this design simply mimics the non-linear response with a filter, instead of actually doing something that really interacts with your amp/speaker load (as in what 99% of modern guitar amps do). So in the end they simply replicate some EQ curve of their preference (note that very few guitar amps are loaded by tuned cabs so the resulting response is actually different), and I agree you could just as well achieve the very same end results with a graphic EQ. ...And in practice this design is not really different from a graphic EQ design stripped to "fixed" values.

Terribly dissapointing and boring design in all regards.

I mean, how many of us haven't seen a distortion effect coupled to a "cabinet simulator" fixed EQ? I trust most of us have seen much better attempts than this.
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Re: LAST VALVE SOUND SIMULATOR

Postby Groovenut » 12 Jul 2015, 15:04

My take from having a look at the circuit is, this is meant to be a tube power amp emulator with the ability to emulate a speaker curve. Not a full blown tube amp. As such the amount of overdrive is going to be fairly subtle. I would guess the main intent for this project is as a direct recording interface. The feature set doesn't really make much sense otherwise.
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Re: LAST VALVE SOUND SIMULATOR

Postby phatt » 13 Jul 2015, 14:40

teemuk wrote:
phatt wrote:Someone may have more understanding of these things but to me that is just a fancy name for a tone control and frankly a tone control with only 3 or 4 dB of boost or cut is not something that would bother to build. Heck,,even an average parq Eq would make a bigger impression


I have to agree.

Considering all the "packaging" and "marketing" involved this project is a big dissapointment.

Looking at it, it's really just a simple "waveshaper" coupled to some EQ'ing. Yes, it does recognize two of characteristics, which would be considered important ingredienmts of "tube sound" today. These would be amplitude/intermodulation distortion and non-linear frequency response due to weaker damping factor.

It's just how these issues are addressed that is terribly lacking. Yes, you will get soft distortion from an overdriven JFET but such non-linear "waveshaper" is not really going to capture all the interaction and dynamics of a typical MULTI-STAGE tube amplifier, which cascades several waveshapers.

So for "tube distortion" part this ends up being just an overdriven source follower amp. Okay. Look at just about any GUITAR AMP schematic and you'll find examples of much more ambitious and realistic schemes to fake tube amplifier's amplitude distortions. Compared to stuff employed in Peavey's TransTube amps, Crate amps, AMT pedals, Prithard amps, Quilter amps, etc. this "tube emulation" looks like a joke. If "distorting" is your only criteria for this performance, then I'll guess you'll be happy with it, though.

The other part is that EQ. Yes, tube amps with poor damping will "reflect" the impedance of the load in their frequency response since their gain changes in interaction with loading impedance. This is a recogniseable characteristic but in the end this design simply mimics the non-linear response with a filter, instead of actually doing something that really interacts with your amp/speaker load (as in what 99% of modern guitar amps do). So in the end they simply replicate some EQ curve of their preference (note that very few guitar amps are loaded by tuned cabs so the resulting response is actually different), and I agree you could just as well achieve the very same end results with a graphic EQ. ...And in practice this design is not really different from a graphic EQ design stripped to "fixed" values.

Terribly dissapointing and boring design in all regards.

I mean, how many of us haven't seen a distortion effect coupled to a "cabinet simulator" fixed EQ? I trust most of us have seen much better attempts than this.


Thanks Teemu, I was hoping someone with a deeper understanding would chime in and help clarify the details.
I lost interest when I realized they where talking about response info for hifi speakers which is a world away from guitar sound.

I note you mention AMT pedals, Any Good? Any observations would be welcomed.

I note *Bajaman* has positive comments about those units.
Thread here; viewtopic.php?f=7&t=26365
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