Re: Tube pedal - does SD make one?
	
		
	
	
		
		
			Ok so what guitar and amp are you using?
What pedals have you tried? What did you like/not like about each pedal?
You might be able to get the sound you are after with a regular pedal but it all depends on the rest of your rig.
There are some pedals that clip hard, and some that soft clip. Ive seen that oscilloscope image and you could be describing the response of a tube screamer...which is not a tube pedal at all.
		
		
	 
Equipment:
Gibson Les Paul - original pickups (why mess with perfection)
 Gibson ES-335 - Seymour Duncan 59s
 Fender Stratocaster - Fender Custom Shop Texas Specials
 Fender Telecaster - Fender Custom Shop Twisted Pair (upgraded wiring with 4 way switch so neck and bridge can be set for either parallel or Series) 
 Fender Stratocaster - Work in Progress Bridge Kent Armstrong Custom made 12 pole, Middle Fender Noiseless, Neck SH-2n (upgraded wiring for 7 tones)
 Ancient Fender Champ 12 tube amp 1x12 Fender speaker
 Marshall AVT50 1X12 combo: Tung Sol 12ax7 preamp tube; Celestion V-30 8 Ohm 
Distortion effects tried:
BOSS OS2
DOD Mystic Blues Overdrive
Ibanez Tube Screamer
Line 6 Spider III 75W (not a pedal but a simulator with a multitude of distortion effects)
ZOOM G1ON
Johnson J-Station
NUX AMP Force
What I didn't/Don't like about any of them is they all have a hard edge to them not a warm saxy type overdrive you get from an overdriven tube amp.
PS - I almost forgot.  My first distortion "pedal" was a xstr radio my father wired an in put jack across the volume pot and put an out phone plug at the speaker output...It was my first love.  2nd was a little box an EE friend of my father made with one xster a few resistors, capacitors and a diode or two.  It had an input and out put jack and a pot to alter the gain, at the time it was a mind blowing contraption.