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Author Topic: BM JM Mod  (Read 44119 times)
erwin_ve
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« Reply #15 on: June 11, 2011, 10:35:01 AM »

I have an old 80s EV12L.

Have tried it a number of times in a ported cabinet...similar to pickmasters snakeskin ditto. However, I find it to be pretty useless for OD .....AT LOWER VOLUMES!  :-)
It better at gig volume.

I have tried a eminence kappa Pro in the cabinet and it has a better OD top end but its perhaps a little dark. The best speaker for The ported cabinet is IMO is a Fane 12L ...it has both great clean tone and great OD tones at ANY volume. And the Fane has a massive bottomend similar to a 4x12. Incredible IMHO.
Is the Fane having the same mounting dimensions as a regular 12"?
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bigwebb83
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« Reply #16 on: August 15, 2011, 02:05:29 PM »

subscribed
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nudefish11
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« Reply #17 on: February 11, 2012, 01:31:33 AM »

Are there any sound samples??? I would love to hear one side by side to a reg ots!!! Also is it more two rock type tone? Cause I am very interested in getting this done to mine if it smooths some harness out of my ots.

Thanks
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Thilo278
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« Reply #18 on: October 25, 2012, 09:29:21 AM »

Sorry to revive that old thread. I'm still considering to let my OTS 50 getting modded.
It was built in march 2008, so should be like a S&M.
I really like that clean John Mayer/SRV sound, so I'm considering the mods posted in this thread. But since I don't have a recent OTS 50/100 but an early OTS without any mods I'm not sure whether I can use them or better stick with the mods posted by Pickmaster in the thread http://ceriatoneforum.com/index.php?topic=740.0 which were done with an early OTS 50, too.

Maybe someone (best would be Ika himself I guess Smiley ) can chime in here?

Thanks!

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Pickmaster
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« Reply #19 on: October 25, 2012, 03:15:45 PM »

Sorry to revive that old thread. I'm still considering to let my OTS 50 getting modded.
It was built in march 2008, so should be like a S&M.
I really like that clean John Mayer/SRV sound, so I'm considering the mods posted in this thread. But since I don't have a recent OTS 50/100 but an early OTS without any mods I'm not sure whether I can use them or better stick with the mods posted by Pickmaster in the thread http://ceriatoneforum.com/index.php?topic=740.0 which were done with an early OTS 50, too.

Maybe someone (best would be Ika himself I guess Smiley ) can chime in here?

Thanks!



No, you don’t need the complicated mods in my old thread you’ve just mentioned.
Better to perform mods mentioned in this thread or one I’ve published couple days ago here  http://ceriatoneforum.com/index.php?topic=4753.msg22766#msg22766

They are almost similar mods and work great for all OTS non HRM amps.
My first amp was S&M 50 and it sounds nice after this mods.
Cheers
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Thilo278
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« Reply #20 on: October 25, 2012, 04:23:21 PM »

Thanks for the quick and helpful answer Ika! Smiley
So with the #102 FM-ME layout I just take the additional mods you marked? I don't have to change the amp for #102 specs I guess, right?
(Or I just stick with the mods in that thread here :-)  )

Do you think that 12-way rotary selector switch (instead of treble bleed) would be a good thing to add to this layout to improve the overdrive channel? It's not very useful with a strat right now for me..

Thanks!
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Pickmaster
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« Reply #21 on: October 25, 2012, 06:07:54 PM »

Hi Thilo,

Treble bleed (usually 0.04uF cap and pot) unfortunately cuts not only high frequencies but also high mids as well.  12 way rotary with 100pf, 200pf,…..1200pf range SELECTS and cuts only highs and very little high mids on higher capacitance so your tone stays richer.

And Yes, stick with the changes here, just introduce 1K linear pot on the presence and if you gona use 12 way rotary, than V2 snubers must be both 330pf  than you will have wide range OD tone.
Be cool.
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Thilo278
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« Reply #22 on: October 25, 2012, 06:34:22 PM »

Okay to sum it up:
The important stuff is this:
•2- or 3-Way switch to select LNFB/switch it off.
•the rotary switch (including 68k slope resistor)
•1k Presence pot
•bright switch = 68pf
•V2's snubbers both 330pf
•Here's a little confusion: "0,01mf cap instead of 0,005 between two resistors before the X –terminal"
  do you really mean mf? or is it a typo and you mean 0,01uf?
(• removing the bass cap is not necessary, right? )

I hope I didn't forget something essential to get me more towards the JM clean sound and have a more useful drive sound? Smiley

Or are these other changes as important as the above mentioned? For example Ratio 200k L or those other value changes on the board where the confusing 0,01uf cap is?

Thanks Ika, you really help me with all those suggestions and tips! Smiley
« Last Edit: October 25, 2012, 08:40:48 PM by Thilo278 » Logged
captainbackfire
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« Reply #23 on: October 26, 2012, 06:17:02 AM »

I'm also a bit unsure what to do with my 2012 OTS 50.

I've removed the bass cap and the LNFB and its much closer to the JM tone.

Now I guess I should also just follow your new layout on the FM Modern Eagle layout on the TR vs. OTS thread right Dr. Ika? And disregard that JM mod layout for OTS 100 on the older thread?

Thanks!
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plasticvonaband
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« Reply #24 on: October 26, 2012, 09:54:21 AM »

Dr Ika knows his shizzy when it comes to modding these amps.
But...

If you really want that classic clean JM or SRV sound:

Stevie Ray Vaughn-SSS 150w 4 x6550 pwr section with Reverb and filter section,- The amp was said to be voiced like Jackson Browne's "White Glove" Dumbleland for Bass. SRV's SSS was essentially a bass amp voiced for guitar frequencies.

John Mayer- SSS 100w with 6L6's, all the features above, this amp is very special and sounds incredible with harmonics that just jump out. Two-Rock based their Sterling Signature on this amp and Henry Kaisers SSS's. This amp can be heard at countless recording and Youtube vids.

SRV used Browne's amp to record some of the tracks on Texas Flood. That being said, some of the best clean SRV sounds I have heard were from the el mocombo concert during Lenny, and that was just a good ol Blackface Twin. Freddie King got awesome clean and dirty sounds from twins and showmans. Good headroom helps alot and can make your clean tone loud and punchy. I played through a BF dual showman in my early 20's. Loved it, but the sweet spot was at such a high volume that no one else could be heard. The SSS that Nik builds, and the original types with the extra driver tube sound good at all volume levels, just as an FYI.

That said, my BM has some of the best clean tones I have ever heard, especially with the right speakers and tubes. It IS a different beast than the rest of the OTS line, and the OD is not OTS mid singing d-style OD, it is more raw and gritty and, well, bluesy with the HRM bypassed it is even more so, and it's just the way I like it Smiley
« Last Edit: October 26, 2012, 09:56:17 AM by plasticvonaband » Logged

Overdrive is like peanut butter. Some like it crunchy, some like it creamy.
Bluesmaster 50 2x12 combo and some guitars.
AustinR9Powers
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« Reply #25 on: October 27, 2012, 04:36:26 AM »

^
What he said! Chair Dance
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Pickmaster
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« Reply #26 on: October 27, 2012, 11:32:28 AM »


Hi,
First of all, uf and mf both stand for microfarad  Grin. U is really Lathin.¨mu¨ - μ  . Peple just use uf instead of μf.
As l've mentioned both diagrams are almost similar.. I'm not with te computer at the moment and will clarify things soon..
Greg, l understand  you love your BM and it is a great amp but moded FM ME has similar or even biger cleans and great drive tone. Switching off the HRM block is a great idea but afterwards you have to tweak a drive  components

I'll be with you guys soon.
Cheers
« Last Edit: October 27, 2012, 11:39:26 AM by Pickmaster » Logged

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StratUltra
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« Reply #27 on: October 27, 2012, 02:02:35 PM »

Hey Doc,

I've been following many of your posts lately as it applies to some of my thoughts around my next ceriatone purchase.

A question, would you recommend an OTS FM over a regular OTS the amp for your mods?

I guess what I'm after is something with two rock cleans but has the ability to from dumble OD to something really thick and fat without the dumble sax like tone. Not sure if it's possible...

Looking to keep the current cab to switch both amps between which currently houses a EVM12L.

Gotta say, I'm digging the BM but find it sounds best with the gain dimed low which it is low gain with quite a bit of highs coming through, and that's with the HRM bypassed. After something thicker with more gain, but still smooth without too much fizz, which i think wouldmprobably mean more mids and less highs.

Would appreciate your thoughts!
« Last Edit: October 27, 2012, 02:06:00 PM by StratUltra » Logged
Pickmaster
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« Reply #28 on: October 28, 2012, 08:22:27 PM »

OK, here we go again,
To Thilo – use 2 way small toggle switch to turn the LNFB on or off.
12 way rotary switch or 3 way toggle switch for V2,2 snubber, chose caps for your taste.
68 k slope resistor, minimum 1w. I use 2w.
Bright switch minimum 68pf or 3 way switch with 68 and 100pf. Or higher if you like more bright tone.
V2s snubbers 330pf and than you increase V2,2s with the rotary or 3 way toggle.
0,01 mf, uf, for a fatter drive tone. If somebody wants more fat increase it gradually to 0,02…0,05 mf but this can introduce flub.
After this cap use 100k resistor on X line for more open drive tone if you have 100k L RATIO pot. If you use 200k L or higher RATIO pot, than reduse 180k X line resistor to 33k or 10k. You will have higher OD volume and more open tone, no fizz.
Remove bass cap or put small toggle there.

To captanbackfire – use above mentioned mods if you have FM ME but as I’ve mentioned mods will perfectly work with all OTSs.

To StratUltra – I recommend an FM EM over a regular OTS because many useful mods are already there so less work for you for other mods.
With above mentioned mods you will have much better clean channel.
OD tone is easy to shape with FOUR components: OD trimmer, V2 snubbers and X – line capacitor / resisto combination.
First change X line resistor to lower value 100k, 50k, 33k,… than increase 0,005mf cap to 0,01 or bit higher value. Than adjust the OD trimmer for desired gain and than reduce drive highs with snubbers.

IMPOTRANT !!!   X line capacitor’s minimum voltage is 600v. I have 1000v ceramic caps.

That’s it, Hope it’s more clear now. Good luck guys and be careful with high voltages.
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StratUltra
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« Reply #29 on: October 28, 2012, 09:21:01 PM »

Thanks again Doc,

I was listening to your YouTube clips to get a feel of the tones of the modded OTS and gezzz some awesome tones and playing I might say! Typically like little wing.

With the mods offered, do you think it's nessacary I use a Clator? Seems the ME mods darkern the FM which is why the Clator is recommended with the FMs.
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