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Post subject: Re: Supersonic 112 mods
Posted: Tue Oct 10, 2017 7:50 am
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I picked up a used SS 60 112 this weekend - great price and the amp is clean as I've seen. Not sure if it's the 2005 model or the 2009 with several mods to taper down the overly bright clean channel on the vibrolux setting. It is very bright to me in the vibrolux clean channel, especially at low volumes and the bass knob seems to have very little effect on the tone. I found a great list of the mods that were done in 2009 and my current plan is to have a professional amp tech do these. That said, I have a couple of questions that I would love to get answers to.

First I'll list the mods I am planning to have done:

1. The first change in the schematic occurs at C2. The original version uses a .0022 µF cap here. The later model ups this value to a .0033 µF in the combo version. This change causes a bit more of a full-range signal to be sent to the Burn channel.

2. The next change is at C7. Originally this was a 120 pF cap; the later model drops this value to a 47 pF. This causes less brightness at lower volume settings in the Vintage channel’s Vibrolux mode.

3. Next we find a change at C11 and R22. Original values were 3.3M and 10 pF respectively. In the newer model, these are changed to 1.5M and 330 pF. This change increases both the level and frequency range of the signal being fed to the subsequent gain stages of the amp. In my opinion, this change probably has the largest impact on the amp’s sound. If you’re simply looking for more out of the Vintage channel, this would be the change to make.

4. The next change consists of two additional components: C99 and R160. It’s a series network consisting of a 0.015 µF capacitor and a 47k resistor attached between the R22/R23 junction and ground. This is a simple low-pass filter that reduces some high frequencies in the Vintage channel. Since these components will need to be discretely added, as they have no circuit board locations in the earlier amps, you could always hold off installing them until your ears decided if they’re actually necessary.

5. Next we move on to C25. This capacitor is at the end of the Burn channel, electrically across the volume pot. Initially a 680 pF cap, it was increased to a 0.001 µF cap in the combo amps. This will shave just a bit more top end off the signal, probably in the hopes to make the combo amp sound a bit fuller and less shrill.

6. The next couple of changes happen in the reverb circuit, starting with R150 and R151. R150, originally a 220k resistor, has been changed to a jumper, and R151, originally 470k, has been changed to 1M. This change substantially increases the signal level to the reverb drive circuit. The result would be a fuller-sounding reverb.

7. The last change consists of changing R167 from a 470k resistor to 1M. This is the reverb return signal that gets mixed with the dry signal in the amp. The new 1M resistor serves to reduce the return signal a bit, likely to compensate for the increased drive signal.

So here are my questions:

1) Is the newer (2009 and later) model still very bright or is it much more balanced on the vibrolux clean channel?

2) Are any of the mods listed above totally unnecessary and ad no benefit?

2) Does new model "tighten" up the drive channel - mine is a little sloppy (again may be low volume issue)?

3) What are the best replacement tubes on the market for this amp, regardless of price? Should I replace just the big tubes or all of them?

4) Are there any other mods suggested that aren't on the list above?

5) Is it worth changing the speaker or wait and see how it sounds after the mods are done?

6) Anything else?

Thanks!!!!


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