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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  AMT Speaker/Cab simulation circuit 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: AMT Speaker/Cab simulation circuit  (Read 3759 times)
J0K3RX
Posts: 1338


Jim - Earth 2014


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AMT Speaker/Cab simulation circuit
« on: April 01, 2012, 08:22:47 PM »

I think the AMT stomps have a very good cab simulation output! So, I was surfing around their site and stumbled upon this... I thought somebody besides myself might be interested..?

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If it sounds good, then it is good...
deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #1 on: April 02, 2012, 04:38:39 AM »

hi jim: if going by the other stuff the ruskies do then this should be very good!....i'm interested. icon_cool

have you tried it yet?...


?  where it says 1000 is that nf  or pf ?... Undecided
« Last Edit: April 02, 2012, 04:45:05 AM by deadastronaut » Logged

J0K3RX
Posts: 1338


Jim - Earth 2014


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Re: AMT Speaker/Cab simulation circuit
« Reply #2 on: April 02, 2012, 06:25:52 AM »

hi jim: if going by the other stuff the ruskies do then this should be very good!....i'm interested. icon_cool

have you tried it yet?...


?  where it says 1000 is that nf  or pf ?... Undecided
Rob,

I haven't tried it, yet! But real soon...

I saw the 1000 as well,  I assumed it was 1uF = 1000nF?

This would be a nice addition to the Spitfire!?

~Jim
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deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #3 on: April 02, 2012, 06:28:00 AM »

cool, i'll have to update this then...oopps and the pot values.. . Roll Eyes


just did a layout for it....unverified obviously... Wink
« Last Edit: April 02, 2012, 06:29:52 AM by deadastronaut » Logged

J0K3RX
Posts: 1338


Jim - Earth 2014


WWW
Re: AMT Speaker/Cab simulation circuit
« Reply #4 on: April 02, 2012, 06:30:14 AM »

hi jim: if going by the other stuff the ruskies do then this should be very good!....i'm interested. icon_cool

have you tried it yet?...


?  where it says 1000 is that nf  or pf ?... Undecided


Also T1 thru T4 are BFT46... Those are surface mount as far as I could find. I can do smd not a prob but I wonder if there are any subs in through hole?

Damn that was fast!!!
« Last Edit: April 02, 2012, 06:33:44 AM by J0K3RX » Logged

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deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #5 on: April 02, 2012, 06:33:39 AM »

i thought they would be just fets...j201's, ...etc etc...
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J0K3RX
Posts: 1338


Jim - Earth 2014


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Re: AMT Speaker/Cab simulation circuit
« Reply #6 on: April 02, 2012, 06:34:46 AM »

i thought they would be just fets...j201's, ...etc etc...

yeah, they probably would work...
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deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #7 on: April 02, 2012, 06:36:25 AM »

cool, might have to bread it when i get time...and a spare board Roll Eyes

ive got 3 things on the go at the mo. Tongue


i'm guessing we could swap that 300k R6 for a pot too....hmmmm... icon_twisted
« Last Edit: April 02, 2012, 06:38:22 AM by deadastronaut » Logged

J0K3RX
Posts: 1338


Jim - Earth 2014


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Re: AMT Speaker/Cab simulation circuit
« Reply #8 on: April 02, 2012, 07:43:38 PM »

I have an AMT Legend P1 which is a 5150 sim and an AMT SS-30 which is a real beast... I think I am gonna open up the P1 and see what's up.. pretty sure it's 2 sided with a combination of surface mount and through hole.. BTW - they both sound incredible!!!

My Fluke meter doesn't do a real good job at checking caps...  icon_sad

Edit: Just opened up the P1 and there are only 3 surface mount caps on the bottom... I didn't take it completely out of the box yet but I can see one of the through hole caps from the battery compartment and it looks like they somehow smeared the writing/markings on the cap... So, I really can't read it.
« Last Edit: April 02, 2012, 08:03:20 PM by J0K3RX » Logged

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Ice-9
Posts: 1569


Mick T


Re: AMT Speaker/Cab simulation circuit
« Reply #9 on: April 03, 2012, 03:15:32 AM »

The AMT cab sim in the Legend series P1 and S1preamp pedals isn't the same circuit as the one posted above. I have both these pedals and traced out the S1. The cab sim is the same in both pedals, although it is very similar to the one posted above it is a bit more simplified.

The pedals use 2SK208R (JR) jfets and BAT54C diodes to simulate the valve curves of the amps they are emulating.
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J0K3RX
Posts: 1338


Jim - Earth 2014


WWW
Re: AMT Speaker/Cab simulation circuit
« Reply #10 on: April 03, 2012, 04:11:46 AM »

The AMT cab sim in the Legend series P1 and S1preamp pedals isn't the same circuit as the one posted above. I have both these pedals and traced out the S1. The cab sim is the same in both pedals, although it is very similar to the one posted above it is a bit more simplified.

The pedals use 2SK208R (JR) jfets and BAT54C diodes to simulate the valve curves of the amps they are emulating.

Hey Mick... You didn't happen to post your schematic in another forum did you? icon_wink
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If it sounds good, then it is good...
deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #11 on: April 03, 2012, 04:14:21 AM »

+1.. Grin
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Ice-9
Posts: 1569


Mick T


Re: AMT Speaker/Cab simulation circuit
« Reply #12 on: April 03, 2012, 04:40:57 AM »

The AMT cab sim in the Legend series P1 and S1preamp pedals isn't the same circuit as the one posted above. I have both these pedals and traced out the S1. The cab sim is the same in both pedals, although it is very similar to the one posted above it is a bit more simplified.

The pedals use 2SK208R (JR) jfets and BAT54C diodes to simulate the valve curves of the amps they are emulating.

Hey Mick... You didn't happen to post your schematic in another forum did you? icon_wink

Indeed I did, search AMT legend S1 (final schematic is halfway down page 2)
« Last Edit: April 03, 2012, 04:45:45 AM by Ice-9 » Logged
deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #13 on: April 03, 2012, 05:19:26 AM »

cool, cheers mick, did you ever build it?..

i may have to try that tonestack too....hmmm... icon_cool
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J0K3RX
Posts: 1338


Jim - Earth 2014


WWW
Re: AMT Speaker/Cab simulation circuit
« Reply #14 on: April 03, 2012, 06:18:59 AM »

I can tell you that the AMT S1, P1, E1 are some of the best sounding "preamp" pedals out!!

And the SS-30 is insane!!! icon_twisted
http://www.youtube.com/watch?feature=player_embedded&v=i7n2_6wuhys
« Last Edit: April 03, 2012, 06:30:49 AM by J0K3RX » Logged

If it sounds good, then it is good...
deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #15 on: April 03, 2012, 06:24:31 AM »

that sounds the @#$%ing nuts.....very icon_twisted
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J0K3RX
Posts: 1338


Jim - Earth 2014


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Re: AMT Speaker/Cab simulation circuit
« Reply #16 on: April 03, 2012, 06:32:21 AM »

that sounds the @#$%ing nuts.....very icon_twisted

Yes Rob, PLEASE do check out the tone stack on that schematic! icon_biggrin


I know, @#$%ing nuts!!! All of the Legend pedals have that sound pretty much!!
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If it sounds good, then it is good...
deadastronaut
Posts: 9358


Rob H. LONDON


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Re: AMT Speaker/Cab simulation circuit
« Reply #17 on: April 03, 2012, 06:37:17 AM »

@jim: i pm'd ya!... Wink
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J0K3RX
Posts: 1338


Jim - Earth 2014


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Re: AMT Speaker/Cab simulation circuit
« Reply #18 on: April 03, 2012, 06:53:39 AM »

@jim: i pm'd ya!... Wink

I pm'd ya back  icon_wink
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If it sounds good, then it is good...
deadastronaut
Posts: 9358


Rob H. LONDON


WWW
Re: AMT Speaker/Cab simulation circuit
« Reply #19 on: April 03, 2012, 06:56:19 AM »

 icon_twisted icon_cool icon_cool icon_cool Wink
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