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18
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Ceriatone / Overtone / Re: Best speaker?`
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on: May 07, 2009, 05:55:01 PM
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Yeah, I like more definition I guess. I wonder if the Ford tone is going through 12-65 and then being massaged by a battery of effects and aural exciters and such.
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19
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Ceriatone / Overtone / Re: Best speaker?`
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on: May 07, 2009, 12:52:27 PM
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Recently got a g12-65 and tried it out, maybe because it isn't broken in, it sounded muffled. I cycled through all the speakers I mentioned before in the same 1X12 cabinet, and ended up coming back to the Weber Blue Dog
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20
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Ceriatone / Overtone / Re: Treble bleed
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on: May 07, 2009, 12:43:51 PM
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Yes! - either way reduce the reisitor value or increasing the capacitor value gives the same result.
The treble bleed works just like the (passive) 'tone' control on your guitar. It rolls the top treble frequencies to ground, producing a mere dull sound.
The best way to trim the highs in the OD mode, is to use a trimmer. I've got a 1 meg trimmer with a 1 nf (=1000 pf) capacitor. I think mine is a third from the ground, giving a resistance of 330 Kohm (so I could just as well use a 470k trimmer). However, dont take my word for it (or anybody's word for that matter) use your ears!!!!. Also it depends on the guitar and speakers you are using.
By the way, I have read you latest posts and have followed your OTS journey and can see that your are close to Dumble heaven ;-)
Thanks Claus, good to hear from you! |
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21
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Ceriatone / Overtone / Treble bleed
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on: May 07, 2009, 11:53:12 AM
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I have installed the treble bleed at the Ratio pot on my Ceriatone OTS (non-hrm), and it works well, yet it seems to be taking out a larger portion of the frequency spectrum than I would like. I am currently using a 1000pF to 45K ohms to ground arrangement. If I wanted to knock out just the very highest, harsh frequencies, how would I change the components?
Am I right in saying that the value of the resistor changes how much of the highs you remove and the value of the cap changes which specific frequencies you remove? Would lowering the value of the cap to 470pF target higher frequencies than the 1000pF or lower frequencys? Sorry to be such a noob, and many thanks as always.
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22
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Ceriatone / Overtone / Re: Snubber caps mod
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on: May 06, 2009, 01:41:36 PM
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If I had put the treble bleed on the Level pot instead of the Ratio pot, would my clean channel be brighter, or is the Ratio pot completely isolated electronically from the clean channel?
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23
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Ceriatone / Overtone / Re: Snubber caps mod
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on: May 06, 2009, 11:44:27 AM
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I installed a simple treble bleed circuit last night on the Ratio pot; didn't have a trimmer so I used a 100K resistor until I get one, in series with a .001uF cap. That was like the missing piece for my amp, no more harshness in the OD, and suddenly there was the Ford tone. The other mods on this amp are:
The Gil Ayan OD entrance mod
3 way Bright switch (120 pF-off-47pF)
Changed the Mid cap to .047uF
Deep mod
Many thanks to all those who have helped me
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25
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Ceriatone / Overtone / Re: Snubber caps mod
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on: May 05, 2009, 12:46:32 PM
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The snubbers act as a low-pass filter. Higher values of snubber cap bring the knee down in frequency. They should not affect mids much... Maybe a better thing would be to use treble bleed circuit... 500k trimmer and .001uf cap to ground from OD2 plate This way you could set the amount of treble you want... it's like having a little treble HRM in there.  Because the overdrive on my OTS (standard, October 2008 version) is a little harsh and I've noticed that nobody's final layout has the 2 470 pFs as the snubbers, (everyone seems to return to the lower value), I'm interested in trying this treble bleed circuit out,but I'm unsure of how to implement it (I'm kind of a noob). I have a couple of questions (and thanks in advance for your time) 1) If I don't want to have the treble bleed characteristics to change as I turn the ratio pot, I would have to avoid the middle lug of the ratio pot and just attach the trimmer and cap across the other two lugs, correct? 2) Are the trimmer and cap in parallel or in series? |
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27
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Ceriatone / Overtone / Re: OK guys, this is my layout...
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on: May 01, 2009, 07:28:15 PM
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My apologies, I was speaking of the mid-boost mini switch, not the PAB footswitch. The second mid-boost cap I was speaking of, if you look at your layout, and follow the (B-3 on the standard OTS layout) wire from the pin on the switch (where the 4M7 resistor is attached to ground) and follow it to the board there is a .002uF cap
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28
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Ceriatone / Overtone / Re: OK guys, this is my layout...
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on: May 01, 2009, 12:30:03 PM
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I notice that you have changed the value of the mid-boost cap from 330 pF to 390pF. Did this significantly change the amount of boost in the mid range ? I would think it would be less boost, which is what I'm striving for as I cannot use the switch as is. What does the second cap on that switch do, the .002uF? It almost looks as if the switch is bring that cap into and out of play when it is engaged. Would I have to increase that value as well to lessen the amount of boost I'm getting?
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30
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Ceriatone / Overtone / What is the effect of changing the cap on the Presence pot
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on: April 28, 2009, 12:36:08 PM
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I noticed there is a 1uF 25V cap in there, and it is connected to the 4 ohm tap. On the ampgarage forum I read that someone changed the cap on his Bluesmaster presence control from a .1uF 250V film cap to a .47uF cap and got good results, getting rid of a high-mid spike. My OTS already has a higher value cap than that in there, but if I tripled it's value to a 3.3uF would I see similar results? Has anyone tried this? I am also interested in the effect of moving the NFB to the 8 Ohm tap, if anyone has experimented.
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