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Old 07-12-2011, 05:16 PM   #1
andrerist
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VHT special 6 ultra mods

hey guys, what kind of mods can i put into my special 6 ultra? my guitar teacher mentioned that it was basically built with the intent of ppl modding it so i was curious as to what kinds of things i could put in in the way of eq and distortion? also, how much would things like that run me to have done?
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Old 07-12-2011, 05:43 PM   #2
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there's probably a lot that can be done to that amp.

i think there are a few forums dedicated to it.

having work done on it by a tech would probably cost anywhere from 50-250 depending on what you wanted done.
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Old 07-12-2011, 06:28 PM   #3
andrerist
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i just searched and couldnt find any dedicated threads. what would i need in order to add things like more gain or more eq? i realize i can probably just by an eq pedal which i will probably do but what would i need for more gain? right now i use an mxr fullbore and its badass but i wouldnt mind having that kind of sound built in
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Old 07-12-2011, 06:56 PM   #4
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start with the schematic...

I believe the nice people from VHT put it in the user manual

http://www.vhtamp.com/manuals/VHT-S...ltra-Manual.pdf if you can't find one

for extra eq you need to find the fixed tonestack that's in there and put some pots in.
It looks like the bog-standard fender tone stack so R13,R14 need to be replaced with a pot, 250k log, and that will be your treble control. R15 become a pot too, 250k log again and that's the bass control. And R16 swap for a 10k linear pot, that's your mid.

you can probably remove the tone control (C18, C49, VR3 and just leave VR2 Pin 2 connected to C19)

as for gain... on the ultra channel jumper R1 and swap R2 for something like 2M. if you're just using the clean channel then jumper R8 and swap R7 for a higher value. If you're using the ultra channel and you REALLY want more gain, do both mods, and also jumper R6 too.
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Old 07-12-2011, 07:03 PM   #5
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on the topic of the fullbore, just leave that in front of the amp, it's the best way to keep getting that sound without basically building the pedal in at the front of the amp
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Old 07-23-2011, 09:28 PM   #6
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can you draw a quick schematic of how to wire the pots into the circuit please
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Old 07-23-2011, 10:03 PM   #7
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and would there be any way to split the mids into low and high mids and have a 4band eq?
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U sure u want a floydrose? those things will make your nerves explode
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Old 07-24-2011, 03:27 AM   #8
GABarrie
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Fender tone stack schematic:


In theory you could put a 4 band EQ in... but you're going to be removing half the amp and altering the sound significantly, plus I don't have a schematic for a 4band passive tone to even begin to be able to advise how to do it.
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Old 07-24-2011, 08:45 AM   #9
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You can change R1 in that picture of a tone stack to a potentiometer wired as a variable resistor, which will change what range of tone that the mid control will control.
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Old 07-24-2011, 01:55 PM   #10
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theres not some way to use caps to filter what goes to each potentiomiter like split the connection for the mid pot to 2 pots and put a cap on each one to filter out hi's one to filter out lows? and thanks for the help
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Quote:
Originally Posted by Punkismygod
U sure u want a floydrose? those things will make your nerves explode
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Old 07-24-2011, 02:07 PM   #11
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now when i wire the variable resistor dose it matter what 2 legs i use it just changes the direction the pot works right i know i use center and either side but dose the side really matter sorry for the newb questions

and also how do you go about figuring the pot value like why should i use 250k for the bass and treble i get the treble resistors combined come close to that but the bass is only 33k should i use a 50k pot there instead?
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Quote:
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U sure u want a floydrose? those things will make your nerves explode

Last edited by selkies : 07-24-2011 at 02:10 PM.
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Old 08-02-2011, 02:00 AM   #12
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ok so i did the mod and the eq section works but the boost dose not work anymore any ideas one wire came off from c14 and was snaked to the input/wolume knobs but i wasnt working in that area so i dont know where it goes any idea from the schematic?
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Quote:
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U sure u want a floydrose? those things will make your nerves explode
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Old 08-02-2011, 08:57 AM   #13
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I'll take a look in a bit... like when its not 400 degrees and I can concentrate
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Old 08-02-2011, 12:21 PM   #14
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c14 goes in series with r9 so that wire could go to one of the ends of r9 but its kind of impossilbe for me to know without knowing the layout, all I can tell you definitely is that it either goes to one end of r9 or it could go to c13.
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Old 08-02-2011, 05:51 PM   #15
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well it sounds like my boost is always on weather the switch is pulled or not i dont know if the switch broke because it feels a bit off or what because the foots witch dose not work either
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Quote:
Originally Posted by Punkismygod
U sure u want a floydrose? those things will make your nerves explode
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Old 08-02-2011, 08:22 PM   #16
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i figured it out the pot for the mids needs to be higher resistance than 10k i used a 50k and it works fine now i also installed a on-off-on switch so that i can switch between the original resistor no resistor and the pot this allows the boost switch to work however not in the no resistor range and has varied effect in the pot range
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Quote:
Originally Posted by Punkismygod
U sure u want a floydrose? those things will make your nerves explode
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Old 08-05-2011, 06:09 PM   #17
GABarrie
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well, despite my plan to build my own amp instead of buying the S6U I seem to have just bought the combo >.< I plan on modding it to my specific needs so I may post a few tutorials and things
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