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Author Topic: Tweaked Layout  (Read 176858 times)
Mitch
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« Reply #15 on: May 02, 2008, 04:49:35 PM »
I believe snipping the cap removes the 'treble bleed' function of the cap on the master volume- a common practice on valve/tube amps as it passes high frequencies through at lower volumes- rather like the 'loudness' control on a hi-fi.  I also own several old marshall amps- some of them sound good with it - some don't.  As soon as I removed one leg of the cap on my OTS I thought this removed the somewhat harsh overdrive tones at low volume- a very easy mod to do and a big bang for yer buck, going to try it at higher gig volume tomorrow to see the REAL difference Grin
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jzucker
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« Reply #16 on: May 02, 2008, 04:51:07 PM »
Quote from: Relicula on May 02, 2008, 03:47:25 PM
What does snipping the cap on the master volume do for the tone?

keeps high treble frequencies from skipping the master volume. The idea of those types of bypass caps is to let the master volume effect frequencies below a certain point. The cap across them allows frequencies above a certain cutoff to jump through the cap, bypassing the master. In this case, the cap is so small, it's debatable whether it was doing much.
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poipounder57
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« Reply #17 on: May 02, 2008, 07:12:02 PM »
Mahalo(Thanks) Jack...great job!!!  You mentioned not all of the mods are highlighted?  Well...guess I have to find my reading glasses:-)
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Rocking on a rock in the middle of the Pacific:-)
jzucker
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« Reply #18 on: May 02, 2008, 10:56:00 PM »
Quote from: poipounder57 on May 02, 2008, 07:12:02 PM
Mahalo(Thanks) Jack...great job!!!  You mentioned not all of the mods are highlighted?  Well...guess I have to find my reading glasses:-)

I don't think I said that. They are all in red. Not all of them are circled is what I meant.
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poipounder57
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« Reply #19 on: May 03, 2008, 01:53:07 AM »
Sorry my bad Embarrassed  must be my not so good speed reading skills Grin
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jzucker
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« Reply #20 on: May 03, 2008, 03:24:26 PM »
Here's a clip of mine with the mods.

Done with the changes for now. Big kudos to Gil Ayan and Scott Lerner for the circuit mods. They did the engineering, I did the soldering.

This clip features an Edwards '56 LP w/ P90s, clean, OD with Mid Boost and OD with PAB

http://www.sheetsofsound.net/demos/ceriatonemodded.mp3

http://www.sheetsofsound.net/demos/ceriatonemodded.wma
« Last Edit: May 03, 2008, 04:12:51 PM by jzucker » Logged
jzucker
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« Reply #21 on: May 04, 2008, 12:57:21 PM »
I updated the first post to include the mouser BOM for the tweaks. Can the moderator make this a sticky? How do I contact the moderator?
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mcinku
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« Reply #22 on: May 04, 2008, 06:08:42 PM »
Quote from: jzucker on May 04, 2008, 12:57:21 PM
How do I contact the moderator?


This is him...
http://ceriatoneforum.com/index.php?action=profile;u=1
 Wink
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Steven_nl
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« Reply #23 on: May 04, 2008, 07:34:30 PM »
so, is Nik doing these mods?
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jzucker
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« Reply #24 on: May 05, 2008, 02:47:46 AM »
what do you mean is nik doing these mods?

Here's another clip:

http://www.sheetsofsound.net/demos/ceriatonetweaked2.mp3
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Steven_nl
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« Reply #25 on: May 05, 2008, 06:33:31 AM »
Hi Jake
Is Nik going to change the layout of the amp with these tweaks? I had the impression you made a remark about this in the TGP forum
you said "I believe Nik is now using a modified version of my (actually Ayan / Lerner) layout for his standard amp"
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erwin_ve
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« Reply #26 on: May 05, 2008, 07:26:11 AM »
This weekend I did most of the mods, only the 270pF to 330pF snubber caps and the 2X 50uF voltage supply caps i didnt.

Clean has become world class. Overdrive needs a tweek, probably the snubbers will do the job. Let you know when done.
Excellent lay-out J. Zucker! Also thanks to Mondo, Ayan and Learner!
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ic-racer
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« Reply #27 on: May 05, 2008, 03:49:26 PM »
Good work jzucker on the layout.

One question. What about the 10k trimmer for the PI. #124 and the original Overtone had 5k. Should this be in RED also? And the 100k Level pot (from 250k)?
« Last Edit: May 05, 2008, 04:20:49 PM by ic-racer » Logged
jzucker
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« Reply #28 on: May 05, 2008, 10:26:12 PM »
Quote from: ic-racer on May 05, 2008, 03:49:26 PM
Good work jzucker on the layout.

One question. What about the 10k trimmer for the PI. #124 and the original Overtone had 5k. Should this be in RED also? And the 100k Level pot (from 250k)?

Yes, I'll have to double check mine. I guess it depends on which version you have. Mine already had the 100k level so I didn't see a change. Mine still has a 10k trimmer. I don't know about that one. I'll ask ayan.
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ic-racer
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« Reply #29 on: May 06, 2008, 02:26:35 PM »
Quote from: jzucker on May 05, 2008, 10:26:12 PM
Quote from: ic-racer on May 05, 2008, 03:49:26 PM
Good work jzucker on the layout.

One question. What about the 10k trimmer for the PI. #124 and the original Overtone had 5k. Should this be in RED also? And the 100k Level pot (from 250k)?

Yes, I'll have to double check mine. I guess it depends on which version you have. Mine already had the 100k level so I didn't see a change. Mine still has a 10k trimmer. I don't know about that one. I'll ask ayan.

Ok, so it looks like those were changes to the Overtone Niki already put into production. Maybe those could be annotated on the layout for those with the original, older versions that want to upgrade.

Not to complicate things, but it looks like Niki may have given you a layout file that did not incorporate his update to the way the switches in the back were wired. #124 used slide switches, but the Overtone uses toggles, and the pins on the toggle are "opposite" the throw of the lever.

* back switches.jpg (17.97 KB, 233x178 - viewed 1520 times.)
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