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Post by tommyellison on Apr 23, 2007 22:03:29 GMT -7
Don't want to burn up a boutique pedal so I'm asking this stupid question. What makes one pedal able to run at 18v or not. What are the limits for pedals listed as 9v?
Is there a list of pedals you guys have used successfully with the 18v rev up?
Thanks
tommy
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Post by ruger9 on Apr 24, 2007 4:00:50 GMT -7
I've never seen a list, and I don't know if there's a "thing" that makes it OK to run pedals at 18V, but I'll put up the pedals I know ARE safe for 18V, thru experience:
Fulltone FD2
Barber LTD
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Post by dizeased on Apr 24, 2007 9:06:59 GMT -7
Perhaps we can start one... I believe the following can also run at 18v
Fulltone OCD
MI Audio Blue Boy Deluxe
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Post by guitarstan on Apr 24, 2007 9:33:25 GMT -7
Perhaps we can start one... I believe the following can also run at 18v Fulltone OCD Correct! I am only running at 9v but the instructions say 18 will work too and maybe change the character a bit for the "better". |
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Post by johnnyl on Apr 24, 2007 10:18:35 GMT -7
Barber DD is OK too
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Post by ruger9 on Apr 24, 2007 14:20:10 GMT -7
This list is a great idea. Let's keep it going people!
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Post by tommyellison on Apr 24, 2007 17:24:01 GMT -7
Anyone running a Keeley Modified pedal on 18v?
Tommy
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Post by tommyellison on Apr 24, 2007 17:36:54 GMT -7
Add the Fat Boost: From Mike Fuller's site: "Running the OCD, Fulldrive2, Bassdrive and FatBoost on 18 volts DC!
Won't that hurt them?
No, not at all, just make sure that the polarity is correct...meaning that the center pin gets the Negative (-) just like the 9volt adapter you'd use with it.
What will it sound like?
Quite different actually....the FD2 gets much more dynamic, a little brighter and a lot less compressed, more articulate, more amp-like, with more of the strings coming through....very nice!. The "Comp-Cut" mode gets a serious increase in headroom without distorting. Using 18volts DC, The FatBoost gets tons more Clean headroom, doesn't distort at all, and can get upwards of 30db of crystal clear gain. The Bassdrive just MUCH better for Bass guitar with the extra headroom and clarity."Link: www.fulltone.com/18volts.htmlTommy |
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Post by stoneham11 on Apr 27, 2007 14:55:11 GMT -7
It has to do with the rating of the components for example the capacitors in my fulldrive 2 are rated at 25V and the Fuzz pedal I built they were rated at 16V
Just my .02 worth
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Post by soundbee on Apr 29, 2007 9:50:51 GMT -7
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Post by bustertheboy on Apr 30, 2007 2:37:24 GMT -7
I recently started running my OCD on 18v into the Ghia- fantastic change. I liked the OCD into a slightly driven Ghia but had to fight too much bottom end which easily ended in mush above 9th fret on the bottom E. Now it is much tighter in the bottom end and much less transistory- more like a driven amp. It even works great into a clean amp.
I just used Mike Fuller's suggestion of daisy chaining two 9v batteries.
Brett
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Post by ruger9 on Apr 30, 2007 3:50:36 GMT -7
about the OCD - couldn't agree more. Into an already-breaking up tube amp, I found it turns to mush & is unusable unless I run it at 18V. I haven't even tried it into a clean amp yet, just 'cause I don't play my amps dead-clean often.
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Post by taswegian on Apr 30, 2007 4:36:20 GMT -7
My Vintage Ibanez AD-80 pedal runs on 18v as does most if not all of the Toneczar stuff.
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mikek
Full Member
Posts: 144
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Post by mikek on Apr 30, 2007 5:33:59 GMT -7
A pedal's capacity to run at a given voltage is usually dependant upon the rating of its capacitors and any opamps or transistors in it. If you're not sure about the opamp, open up your pedal, look at the number on the chip(s) (ex - RC4558, OPA2234, TL072, TL071, etc). Go to Mouser.com and do a search on that part number, then download the Data Sheet.
As mentioned, the capacitors, specifically the aluminum electrolytic capacitors are important too. You'll see most builders using Xicon @ 16v. Just look at all the electrolytic capacitors, and find the voltage rating printed on them. For example, you might see "100uF 16v". This is a 100 microfarad cap rated for 16v. Most poly film capacitors in pedals are rated for a minimum 50v, tantalums being higher than eletrolytics, and ceramic disk even higher. Silver mica caps, though normally not used in many pedals, have exceptionally high voltage capabilities. The silver micas I use in my own pedals can easily withstand 500v.
More often than not, the only designs that will benefit from an increased Vcc are opamp-based. Opamps benefit from the extra voltage, and you'll get more headroom and sometimes a perceived tightening of the bottom-end (low frequencies cause more distortion in many designs). Some FET buffers and boosters will benefit from the higher Vcc too, again, you'll get more headroom and output.
Hope this helps.
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