Show 'n Tell Time - Latest DIY, the SimulAmp

Curtis said:

At the moment it's looking like a 50W-100W inductive dummy load, feeding a cabsim filter,

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That sounds a bit like towards the Marshall, what wassit, SE-100 route, right ?
I've always been curious to how 'real interaction' of amp & speaker(/ok, inductive emulation) compares
to just a resistive power-load & providing a bump in the response with a filter.

Bye,

  Peter

Yeah, the SE100.  I did try and make the filter-only section a while back (no inductive load), but it sounded like pants by itself.  I guess the loadsoak section has a significant part to play in the simulation in that design.

The design I'm toying with is based on some of the ones shown over at the Aiken Amps site.  With the appropriate post-filtering I'm getting some pretty good results, better than what I was getting before.  No doubt a lot of the improvement will be down to the power tubes and output transformer of the amp working hard into the load.

Curtis,

Like you suggested 1 month ago, I keep pestering at you 

Just wanted to make a bump and wish you all a happy 2009  8)

By the wa y I've found a source for 8pdt switches - audiomaintenance got them.

the best result i've gotten so far was with a
Hotplate into a plamer d.i. box into a Millenia STT-1
[ unbeknownst to me simular to what Satriani uses ]
Still lacking a little size though ,

So would love to get the power stage thing going with Ampulator

btw i tried some tech 21 class A / AB  overdrive box , ...............
nice idea, if it worked !

Hi Flaheu

By the wa y I've found a source for 8pdt switches - audiomaintenance got them.

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That's fine, but you really need an interlocking section for the 1/2/4 speaker selector switch.  I doubt you're going to be able to get it without ordering a custom switch assembly.  The speaker selector switch array is a 4PDT, 6PDT and 8PDT all interlocked together (pushing one in releases the other two).

Just bear with me for a bit, I think the relay version of this thing will be a lot easier to build.  I'm only just back from holidays, but I'm hoping to resume my DIY activities soon.

the best result i've gotten so far was with a Hotplate into a plamer d.i. box into a Millenia STT-1

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Yes, I find I get better results using an actual guitar amp running into a dummy load and then a speaker filter of some sort too.

btw i tried some tech 21 class A / AB  overdrive box , ...............nice idea, if it worked !

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I think I read an interview with the guy behind Tech21 some time back - apparently a lot of his work revolved around building up classic guitar amp circuits in miniature.  He'd take a schem of a common tube amp, and rebuild it using JFETs instead of tubes and 9V batteries instead of big HV supplies.

Go Curtis Go !
[ you know the longer you wait  , you more stuff i buy and get more angry with you , well not really ]

I was thinking the amp into the hotplate into the ampulator , not subsitute but addition

the  class A , A/B overdrive box just didn't have the loud amp sound that you might think
something patterned after an amp output stage would , when it got usable it was already too
overdriven , maybe it'd sound good loud, many things do , but not quite

Curtis said:

I think I read an interview with the guy behind Tech21 some time back - apparently a lot of his work revolved around building up classic guitar amp circuits in miniature.  He'd take a schem of a common tube amp, and rebuild it using JFETs instead of tubes and 9V batteries instead of big HV supplies.

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A bit like this perhaps ?






That's a Supro Thunderbolt'66/ Fender Bassman '59 / Matchless 50 and Marshall spkr sim
made from Jfet "sims" of the amps.
They sound pretty damm good too !

samples :
http://www.aronnelson.com/userfiles/Clean%20GTR%20Supro.mp3
http://www.aronnelson.com/userfiles/Crunch%20GTR%20Supro.mp3
http://www.aronnelson.com/userfiles/RM%20BoostsSupro.mp3
http://www.aronnelson.com/userfiles/Warm%20Bass%20Supro.mp3
http://www.aronnelson.com/userfiles/59Bassboyclean.mp3
http://www.aronnelson.com/userfiles/59%20pushed%20TS9.mp3
http://www.aronnelson.com/userfiles/59Bassboyfull.mp3
http://www.aronnelson.com/userfiles/RockFaceFuzz.mp3



Marty.

Whoa!

That thing sounds great!!!!

I was thinking the amp into the hotplate into the ampulator , not subsitute but addition

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You can bypass the speaker sim section in the Ampulator, but the sound tends to thin out quite a lot.  Not just from the loss of the LPF effect of the speaker sim, but also the bass response drops off significantly.  There's quite a lot of post-filtering going on after the power tube section.

FWIW, if you go to the Ada Depot website, you can download the schematics for the MicroCab cab simulator.  The zip file contains the PCB layout as a PDF.  (If Flaheu is getting sick of waiting for me to finish the layout for mine he might want to check out the MicroCab instead  )  The MicroCab isn't as configurable as the cab sim section in the Ampulator, but it's based on the exact same circuit topology.  Couple it with an inductive load and you've probably got the basis for a really nice load soak/cab sim.

A bit like this perhaps ?

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Hehe, yes perhaps.  Sounds pretty good too Marty

Curtis said:

Hehe, yes perhaps.  Sounds pretty good too Marty

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Thanks, sounds better in "real life" than the mp3's
Yours is a serious good looking beast though !
I might make it into a gtr "project" one of these days. it's based on stuff that Doug Hammond
did and www.runoffgroove.com did over the last few years.

MM.