I have a 100w sebago sound Texas Flood (SSS #002 inspired) which I LOVE. The only thing I am running into is low end "flabbyness" issues. My hypothesis is that sub frequencies are polluting/distorting the low end...but I am no expert. I am pretty sure this is a symptom of the circuit itself, and not of Bill's work on the Texas Flood, so I thought I would ask the various experts here:
Is this a symptom of the SSS circuit in general?
Should the filter section help here? Or is the "damage" already done where the sub frequencies have already entered the signal path?
I noticed that with Rock switch enabled, the Mid and Bass EQ does basically nothing. I can roll both of them to 0 or 10 and the difference is essentially imperceptible...is this expected from the original design?
Any other things to consider?
My settings are:
Preamp = 3.5
Bright = off
Deep = ON (this doesn't affect flabbyness meaningfully)
Rock enabled
Treb 7
Mid 7
Bass 5
High Filter 3/5
Low Filter 2/5
Master 5.5
All my preamp tubes are TubeStore Preferred Series 12AX7's if that matters...but I hope not to get into a tube discussion if we can avoid
Any insight is appreciated! I can also record it if that helps.
I dont know what schematically "SSS002 inspired"means. But my SSS002 has no flabby low end. It is massive and tight but not too much.
Tone controls are working fine at my build.
Maybe ask Sebago?
I dont know what schematically "SSS002 inspired"means. But my SSS002 has no flabby low end. It is massive and tight but not too much.
Tone controls are working fine at my build.
Maybe ask Sebago?
That's exactly the same impression I had from my #002
I'll record some stuff when I get a chance. Again, I doubt it's an issue directly w Bill Dunham's interpretation, but I figured there are more experienced folks than me when it comes to the topology of the SSS.
I built the exact same amp as Bills and used the same boards as he used in his Texas Flood and I can tell you there is nothing flabby about the low end. (I've used it as a Bass amp) The fist thing to go on mine are always the speakers
Tony
" The psychics on my bench is the same as Dumble'"
rdavy wrote: ↑Sun Sep 18, 2022 1:13 pm
Have you tried a different speaker?
I have a Celestion gold / G12H 2X12 and also a Boss Waza Tube Expander...both have the issue. I am away from the amp right now but will try to record something.
rdavy wrote: ↑Sun Sep 18, 2022 1:13 pm
Have you tried a different speaker?
I have a Celestion gold / G12H 2X12 and also a Boss Waza Tube Expander...both have the issue. I am away from the amp right now but will try to record something.
So you are using an attenuator with a pair of Alnicos on an SSS?
Tony
" The psychics on my bench is the same as Dumble'"
rdavy wrote: ↑Sun Sep 18, 2022 1:13 pm
Have you tried a different speaker?
I have a Celestion gold / G12H 2X12 and also a Boss Waza Tube Expander...both have the issue. I am away from the amp right now but will try to record something.
So you are using an attenuator with a pair of Alnicos on an SSS? :lol
Tony
Those poor tiny little voice coils !!!
Edit :
These specs are gonna fold one way or another … derate the gold to 30watts if you are paralleling with the g12h . 100 watt amplifier gonna push ‘em…
You do not have the required permissions to view the files attached to this post.
I have a Celestion gold / G12H 2X12 and also a Boss Waza Tube Expander...both have the issue. I am away from the amp right now but will try to record something.
So you are using an attenuator with a pair of Alnicos on an SSS? :lol
Tony
Those poor tiny little voice coils !!!
Edit :
These specs are gonna fold one way or another … derate the gold to 30watts if you are paralleling with the g12h . 100 watt amplifier gonna push ‘em…
It's kind of irrelevant to my issue, I think. Speaker load doesn't seem to matter, and also the TAE abstracts speaker load away from the speakers.
I get the distorted low end through the Boss TAE's headphone output as well. I have tried changing the resonance/presence impedance settings on the TAE with no success. I also have taken the TAE out of the situation and gone straight to the cab and experienced the same issue.
So you are using an attenuator with a pair of Alnicos on an SSS? :lol
Tony
Those poor tiny little voice coils !!!
Edit :
These specs are gonna fold one way or another … derate the gold to 30watts if you are paralleling with the g12h . 100 watt amplifier gonna push ‘em…
It's kind of irrelevant to my issue, I think. Speaker load doesn't seem to matter, and also the TAE abstracts speaker load away from the speakers.
I get the distorted low end through the Boss TAE's headphone output as well. I have tried changing the resonance/presence impedance settings on the TAE with no success. I also have taken the TAE out of the situation and gone straight to the cab and experienced the same issue.
Well that’s definitely cause for a different alarm . The amp is made by a very reputable builder obviously ,so I will put my money on the tubes as a relativity safe bet.
Almost always tubes are default number one suspect for me troubleshooting, they can predictably behave rather unpredictably over time . Easy to swap and see if you got ‘‘em and remove that variable from the equation.
However, no matter how you slice it or dice it : 100 watt amplifier running directly into a 212 cabinet with a total power handling rating of 60 watts isn’t going to do well…it should probably be best paired with the attenuator in that case .
[*]I noticed that with Rock switch enabled, the Mid and Bass EQ does basically nothing. I can roll both of them to 0 or 10 and the difference is essentially imperceptible...is this expected from the original design?
I don't think this is normal and may well be a defect. This defect could just be something minor like one loose wire or broken switch. In both the mic (jazz) and rock setting the tone controls should work. (Unless the amp has a PAB that is engaged)
