Since I couldn’t find it elsewhere, here’s a roughly-chronological list of K&M era (pre-PBG) Two-Rock amplifiers. A lot of this info comes from this article by Joe Mloganoski.
- K&M Amp (April 4th, 1999 to August, 2000)
2 channels, 50 watts, reverb. - Emerald (October 1999 to Early 2001)
2 channels, 50 watts, reverb - Sapphire (1999 to 2000)
100W version of Emerald - Amethyst (1999 to ????)
2 channels, 50 watts, reverb. Similar to the Emerald with a slightly different preamp. - Amethyst Special (November 1999 to April 2000)
Indoor Storm model with 50 watt and a 5 watt output sections. - Emerald Pro (September 2000 to ????)
Smooth HRM style - Sapphire Pro (2000 to ????)
100W version of Emerald Pro - Emerald Pro+ (2000 to 2001)
Early Opal - Opal (May 2001 to 2007)
50 watts, 2 channels, reverb - Topaz (July 2001 to ????)
Non NOS replacement for Emerald Pro - K&M Custom (Custom run from September 2001 to February 2002, Production from March 2002 to ????)
Non HRM based on Steve Kimock’s Dumble - Ruby (April 2002 to ????)
One channel. - Onyx (Debuted as the Garnett at NAMM 2003, production from February 2003 to 2007)
2 channels with independent controls. - Custom Reverb (February 2003 to June 2005)
2 channels, reverb - Sterling Signature (2004)
Single channel, 100 watts. - Jade (January 2004 to ????)
2 channel, 50 watt, pcb - Ltd (August 2004-????)
2 channel, cathode or fixed bias, accepts 6L6 6V6 or EL34 - Custom Reverb Signature (November 2004-December 2006)
Signature variant of the Custom Reverb - Custom Reverb Artist (June 2005-????)
Replaces the Custom Reverb. - Overdrive Signature (2006-????)
2 channels. Like a Custom Reverb with all the bells and whistles. - Jet (April 2006-????)
Basically a simpler, lower wattage Custom Reverb. 30 watts with 6L6 or 22 with 6v6 - Steve Kimock Signature (December 2006-????)
Octal preamp signature model. - Custom Reverb Signature V2 (December 2006-????)
An even smoother development of the CRS. The clean channel is killer on this one. - John Mayer Signature (March 2007-August 2007)
100 watt clean amp. - Classic #1 (August 2007-????)
An update to the Custom. 2 channels, No reverb, FET, 50 or 100 watts. - Classic Reverb (October 2007-Present)
50W or 100W single channel with FET boost. My favorite Two-Rock. - Jet Signature (August 2007-????)
The Jet gets the sig treatment. - Classic #2 (March 2008-????)
50 or 100 watts. HRM circut similar to the Emerald Pro but without reverb. - Classic #3 (March 2008-????)
2 channels, 50 watts, tube rectified. - Custom Clean (November 2008-????)
Single channel. High and low filters. 50W, 100W, or 150W (6550) variants. - 10th Anniversary (January 2009-????)
2 channels with independent eq, PAF reverb. 50W with tube rectifier or 100W with solid-state rectifier. - 10th Anniversary J-2 (November 2009-????)
- TS-1 (July 2010-????)
A tribute to Taku Sakashta, based on Robben Ford’s #104 amp. - Custom Reverb Signature V3 (July 2010-????)
Another take on the CRS, with contour instead of presence. - Eric Gales Signature (July 2010-????)
2 Channels with a Marshall-esqe voicing. - Studio Pro (2010-????)
Single channel clean amp built in a Jet box. Pickup loading control. #1 might be the only one built prior to the announcement of PBG buying Two-Rock.
On November 24th, 2010 Two-Rock was sold to Premier Builders Guild, which ends this list.