Tweaked Layout

Mike
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« Reply #60 on: May 20, 2008, 05:24:01 PM »

Thanks for the infos and of course the mod. Nik can do it exept for the two 470 Ohm resistors since they would prevent using EL34s as an alternative he says. I do not hope that this flexibility would counteract the benefits of the mod too much and I am also not aware if this will be the standard for the OTS then - but I am already very curious how this will all sound in the end. Gorgeous I suppose - as you do on your YouTube demos which I view already for some time....Again many thanks to you and also Nik - the reference in customer support.


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chipdog
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Re: Tweaked Layout

« Reply #61 on: May 23, 2008, 07:04:31 PM »

FYI, I emailed Jack with the following questions (did I say I was a newbie?). His answers follow. Thanks Jack!

Sorry Jack, one last email before I heat up my soldering iron. Do each of the red letter mods on the schematic replace an existing component? For example, do the 350 Volt 47uF Caps replace the 100uF 450V Caps? Are there any mods that do not replace existing parts? Finally, there are two components circled on the Power Amp in Pre-amp out mod - did you snip them both?

From Jack:

the drawing should be self explanatory. The two 47uf caps are in parallel with the existing 100uf caps. The circled sections I snipped the caps/resistors. Make sure on the effect loop that the jumper wire between the two jacks is not snipped. Everything else will be replacing the existing part.


« Last Edit: May 23, 2008, 08:57:22 PM by chipdog »	Logged

chipdog
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Re: Tweaked Layout

« Reply #62 on: May 25, 2008, 02:30:58 AM »

Hey, I completed the mods on my OTS this weekend and it sounds amazing. All the goods everyone has talked about are there. Thanks to Jack for bringing these to our attention.


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johnnymac
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Re: Tweaked Layout

« Reply #63 on: May 25, 2008, 06:25:57 PM »

The easiest and most profound changes to the tone of the OTS can be made to the tone stack. For instance: change the 150k slope resistor to 100k and change the 0.002mf treble cap to 1000pf or 500pf. This well drastically change the treble/mid/bass balance and you might like it. There are virtually infinite combinations that can be made to the tone stack that will alter the tone much more than adding 25mf capacitance to the filter network or upping the value of the preamp cathode bipass caps. Also, many people have stated that they hate the FET preamp. With a little tweaking mine sounds great. Just get the input voltage right (increase it by increasing the resistance to ground) and it sounds great. And after trying it; I really don't like the 470k screen resistor swap. Each to his /her own...


« Last Edit: June 03, 2008, 05:40:57 AM by johnnymac »	Logged

erwin_ve
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Re: Tweaked Layout

« Reply #64 on: May 25, 2008, 06:40:16 PM »

Quote from: johnnymac on May 25, 2008, 06:25:57 PM

The easiest and most profound changes to the tone of the OTS can be made to the tone stack. For instance: change the 150k slope resistor to 100k and change the 0.002mf treble cap to 1000pf or 500pf. This well drastically change the treble/mid/bass balance and you might like it. There are virtually infinite combinations that can be made to the tone stack that will alter the tone much more than adding 25mf capacitance to the filter network or upping the value of the preamp cathode bipass caps. Also, many people have stated that they hate the FET preamp. With a little tweaking mine sounds great. Just get the input voltage right (increase it by lowering the resistance to ground) and it sounds great. And after trying it; I really don't like the 470k screen resistor swap. Each to his /her own...

I didn't try all your possibilties; making such big differences random around the amp is nice for testing purposes.
Making the amp balanced for both clean/drive and PAB(with same tonesettings) is a long and painstaking art. I' m really glad that the mods presented, were balanced. For single coils it needs a little tweak around. But the amp right now is gigworthy for me.
Doing such big value swaps makes me wanna buy/build a second amp just for testing.


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Mike
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Re: Tweaked Layout

« Reply #65 on: May 27, 2008, 05:04:38 PM »

I compared the April 1 layout with the Jack Zucker modifications and the new layout per May 26, 2008.

The new layout follows all proposals of the Jack Zucker modifications (JZ mod) exept for:

1. JZ mod proposal: 2 X additional 50uF 350V parallel to the 2 X 100uF 450V
April 1 layout: no additional caps
May 26 layout: no additional caps (no change to old layout)
Reason for non-adoption: not known per today

2. JZ mod proposal: 2 X 470 Ohm 5W instead of 2 X 1 KOhm 5W
April 1 Layout: 2 X 1 KOhm 5W
May 26 layout: no change
Reason for non-adoption: EL34 compatibility
....and it was stated before that this would not really benefit sweeter
cleans either

3. JZ mod proposal: 4.7uF 25V instead of 1uF 25V
April 1 layout: 1uF 25V
May 26 layout: 5uF 25V
Reason for non-adoption: near adoption but not known per today why
not exactly

4. JZ mod proposal: 4.7uF 25V instead of 2.2uF 25V
April 1 layout: 2.2uF 25V
May 26 layout: 5uF 25V
Reason for non-adoption: near adoption but not known per today why
not exactly

5. JZ mod proposal: 2 X 330pF instead of 2 X 220pF
April 1 layout: 2 X 220pF
May 26 layout: 2 X 390pF
Reason for non-adoption: not known per today

Maybe someone (for example ampkits Wink

) could shed a light on points 1. and 5 ?


« Last Edit: May 27, 2008, 05:06:30 PM by Mike »	Logged

AlexF
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Re: Tweaked Layout

« Reply #66 on: May 31, 2008, 03:54:32 PM »

I've gigged my amp with and without the mods listed. Mod 1, added filter caps will not be noticeable at lowish volume levels, but at gig levels, say master on 7, this mod tightens the low notes, makes them a little cleaner whereas they can be a little blurry and wooly without the mod. Recommended. Incidentally, its important to get the 350v or some other small version, room is tight to fit them. I had some 500v sprague caps, which are really too big to fit, I had to shoe-horn them by sitting them on the bottom of the PT - not great.
Re mod 5, it works in tandem with mods 3 and 4 at fattening the OD channel. Its very fiddly to fit the new caps, and I bottled it and fitted 100pf caps in parallel with the existing 270pf ones, giving me 370pf value. Sounds good though with the other mods done and suits me much better.
Re mod 2 - most of the vintage amp guys recommend changing Fenders from 470 ohms to 1K, so I'm not sure why there is a recommendation to change the other way. I cant see there being a noticeable sound difference and safety is increased at 1K, this is the only mod I havent done.
Al


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bluesfendermanblues
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Re: Tweaked Layout

« Reply #67 on: June 01, 2008, 09:13:41 AM »

Quote from: Mitch on May 15, 2008, 05:38:21 AM

Quote from: scotto on May 14, 2008, 11:50:45 PM

The Overtone has an inherently 'middle-frequency' bias- using humbuckers (especially un-potted one's like the SL's) makes this mid frequency hump even more pronounced; I suggest experimenting with changing the deep/bright switch caps in the amp - not sure what values you'd need to brighten the response - any of the other guys here could chip in with advice on that?
Huh?

I forgot to say that I also installed treble bleed caps in my Les Paul too- so if you dial back on the volume you don't darken your tone- easy to do and plenty of advice on the web about that mod. Maybe the deal with the Seth Lover pup's is that they were designed to mimic exactly the tones of original PAF's in Les Paul's - which were intended to be Jazz guitars! You might also try Eric Johnson signature humbuckers- which look like standard pups still with all the noise cancelling etc... but sound much like single coils- apparently Eric Johnson had the same 'too-dark' problem with humbuckers - so we're in good company then! Grin

Hey, Jzucker's mod to change the bright cap from 390p to 120p seem to have become state-of-art on this forum, but perhaps the "old" value of 390p would be better suited to humbuckers???


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scotto
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Re: Tweaked Layout

« Reply #68 on: June 09, 2008, 02:05:24 PM »

I wound up with the Dimarzio EJ pickup. It's brighter and more focused than the Seth Lover. My objective is a setup that will work with both single coil and humbucker guitars. My single coil sounds are so good, I preferr not to mess with the amp anymore. The EJ works pretty well. Not perfect, but I'm still tweeking settings. I think it will be fine once I'm done tweeking.


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bluesfendermanblues
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Re: Tweaked Layout

« Reply #69 on: June 11, 2008, 05:59:19 AM »

I've put 47p (mesures 44p) on my mastervolume . It really opens up the amp and my clean slund is at an all time high. Try it !


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Mike
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Re: Tweaked Layout

« Reply #70 on: June 11, 2008, 02:08:42 PM »

Is this on basis of the May 26 layout ? and when you say "on the mastervolume" where exactly between which two points ? ..and for which guitar / pickup is this worth a try ? All the best from Switzerland, Mike


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Alpedra
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Re: Tweaked Layout

« Reply #71 on: June 15, 2008, 10:39:46 AM »

Hi guys. I have an Overtone from the first batch of the year. Which means I have to change the pot. I´ll do the other mods too.

I´ve ordered all the parts from Jerry´s BOM and have them already.

Now I´m only missing the 100k alpha pot..

can anyone tell me if this is the right one:

http://www.banzaieffects.com/Alpha-16mm-split-shaft-100k-log-pr-17269.html

Thanks Wink


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fullerplast
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Re: Tweaked Layout

« Reply #72 on: June 15, 2008, 02:39:53 PM »

If you want to make things a bit easier you can simply tack a 220K resistor to the outside tabs of the pot. That will also make it easier to switch back to hear the difference or simply change the range to a "virtual" 150K or 90K pot by using a different resistor in parallel.

Quote from: Alpedra on June 15, 2008, 10:39:46 AM


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jake
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Re: Tweaked Layout

« Reply #73 on: June 19, 2008, 11:10:28 AM »

I got my "tweek" parts in yesterday from Nik. I went with him to make sure I was getting the correct parts. $20.00 shipped.

I put them in last night and the amp fired up (whew Tongue

). First impression, the clean channel is even better. The od is different, I don't know if I'd say it was better at this point. I think I might need to readjust the internal trimmer?


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bluesfendermanblues
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Re: Tweaked Layout

« Reply #74 on: June 19, 2008, 11:49:23 AM »

Quote from: Mike on June 11, 2008, 02:08:42 PM

Hi Mike,

You solder the 47p to the input tap and center tap of the mastervolume...those are the two legs that are NOT connected to ground.


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