Training Example: Dr. Z Amplification – Review the Data, Give Your Score & Compare to the Real AI Evaluation

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[H4] Z-40: 40 Watt British Powerhouse
Out of the shadows of it’s larger brethren, the Z-40 is featured in 1×12 combo format and head, loaded with a high-headroom WGS ET-90 speakers, and features a switchable tube/solid state rectifier! Authentic “Invasion” cleans and robust, classic rock crunch in an portable package!
[H4] The Z-28 Mk. II is Premier Guitar’s Premier Gear!
“Simultaneously stout, thick, articulate, with beautiful cleans and excellent overdriven tones…” -Dave Hunter, Premier Guitar. Contact your Dr. Z dealer to jump on limited introductory pricing!
[H4] OCTAL SIX: A New Standard For Vintage Tone
Dr. Z’s all octal tube design, the Octal Six combines the unique character of the 6SN7 and 6SL7 octal preamp tubes with the superb headroom of the 7591 power tube for a recognizably vintage tone with exceptional clarity and fidelity.
[H4] The Z WRECK JR. receives Guitar Player’s EDITORS’ PICK!
“…excels at straight-in, guitar-to-amp playing, and delivers a tactile, responsive playing feel that becomes more a part of your own playing style as you work with it.” – Read more in Guitar Player’s June 2020 review!
[H4] X-RAY: Unmatched Clarity!
[H4] Z-80: 80 watts of chime!
6 years in the making, the Z-80 represents the pinnacle of Dr. Z’s line. Inspired by the extremely rare Vox AC80/100 used by the Beatles on their last US tour, the Z-80 takes a crown jewel of tone and brings into today, with modern build quality, updated features, and enhanced road-reliability.
[H1] Get plugged in
[H3] Hello

[H2] X-RAY
[H5] “See through to every nuance of your tone with the X-RAY!” – Dr. Z
[H3] Specifications
Output Power30/15 watts Output Tubes4 – 6n14n (mil-spec EL84 variant, cathode biased)Preamp Tubes1 – NOS 5879 (ruggedized pentode), 1 – 12AX7, 1 – 12AU7Rectifier1 – 5AR4ControlsVolume, Tone, Cut, Master, 1/2 Power SwitchOtherTube-driven FX loopConfigurationHead, 1×12 Combo w/ WGS Retro 30Dimensions & Weight1×12 Combo: 22 1/2″W x 10 1/2″D x 20″H, 48 lbs.
Head: 20 5/8”W x 9 1/2”D x 9 1/8”H, 34 lbs.Owner’s ManualPrint Manual
Video Manual
[H3] General Information
The X-RAY is the long-awaited response to the demand of two different Legacy amps that were discontinued many years ago. It was conceived as an amalgamation of two amps country legend Brad Paisley helped popularize in the 2000s and 2010s, the Stang Ray and the DB4, both of which are still featured his live backline today. Over the years, a few modifications, tweaks, and design evolutions took place in both of these amps, those of which have all been included in this latest advancement.
Powered by Dr. Z’s favorite NOS 6n14n power tubes, the X-RAY models the same chiming clean headroom of the original Stang Ray, showcasing an articulate, snappy, British Invasion inspired jangle that the Fab Four would have fallen in love with. Twisting the knob clockwise unleashes a rush of mid-forward saturation, the uncanny overdrive signature provided by the 5879 pentode preamp tube featured in the X-RAY and first introduced into the Z roster by the DB4. Combining the chewy, churning overdrive of the DB4 with the snap and sparkle of the Stang Ray was the goal; evolving the design to be flexible with today’s breed of player takes the X-RAY over the top. Both of its predecessors were non-master volume designs, AKA loud! The X-RAY delivers the same 30 Z-watts of its forebearers but its new post-phase inverter master volume adds welcome flexibility to the design, pleasing sound techs, housemates, and neighbors that may be a tad volume sensitive. Further, a front panel mounted half-power switch allows the player to alter the compression and dynamics of the power amp for a smoother, silkier feel at 15 watts. Finally, Dr. Z included a tube-driven FX loop to push the X-RAY’s signature voicing through the effects signal path of your choice, with no loss in high end, dynamics, or tone.
The X-RAY is available in two configurations, head and 1×12 combo, the latter of which sports a striking quantum silver front valance and is loaded with a WGS Retro 30, a 75 watt speaker that has become an overwhelming favorite in the Z test room and was specifically stocked for this amp at the Doctor’s request. Dr. Z’s stalwarts are all present here: a custom welded, aircraft grade aluminum chassis is the skeletal structure, hand-selected, high quality components are the viscera, and all systems are sutured together in-house in Cleveland, OH by technicians with a quarter century of experience under the proverbial knife. As usual, Heyboer Transformers are the iron heart of the X-RAY and NOS mil-spec tubes breathe life into the lungs of the amp.
X-RAY head on 112 ext cab
[H3] Sounds
X-RAY played by Dave Baker
[H3] X-RAY played by Dave Baker
Recorded with a SE VR-1 Ribbon.
[H2] Videos
[H2] Speakers
WGS Retro 30
[H2] WGS Retro 30
Size
Impedance
Power
Magnet
Sensitivity
12″
8ohm
75W
Ceramic
99.6 dB
Celestion V30
[H2] Celestion V30
Size
Impedance
Power
Magnet
Sensitivity
12″
8ohm/16ohm
60W
Ceramic
100 dB
[IMG: Celestion Vintage 30]
Z12
[H2] Eminence Z12
Size
Impedance
Power
Magnet
Sensitivity
12″
8ohm/16ohm
50W
Ceramic
99 dB
[IMG: Dr. Z-12]
Celestion Gold
[H2] Celestion Gold
Size
Impedance
Power
Magnet
Sensitivity
12″
8ohm/16ohm
50W
Alnico
100 dB
[IMG: Celestion Gold]
Celestion G12H
[H2] Celestion G12H
Size
Impedance
Power
Magnet
Sensitivity
12″
8ohm/16ohm
30W
Ceramic
100 dB
[IMG: Celestion G12H]
Celestion Creamback
[H2] Celestion Creamback
Size
Impedance
Power
Magnet
Sensitivity
12″
8ohm/16ohm
65W
Ceramic
98 dB
[IMG: Celestion Creamback]
Celestion Greenback
[H2] Celestion Greenback
Size
Impedance
Power
Magnet
Sensitivity
12″
8ohm/16ohm
25W
Ceramic
98 dB
[IMG: Celestion Greenback]
[H6] Disclaimer: while the information contained on this page is correct at the time of publication, due to our policy of constant improvement and development, Dr. Z Amplification reserves the right to alter specifications without prior notice.
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[H2] Authorized U.S. Dealers by State
Alabama    Colorado    Connecticut    Georgia    Illinois    Indiana     Kansas    Kentucky   Louisiana   Maryland   Massachusetts    Missouri    New York    North Carolina    Ohio    Oklahoma    Pennsylvania    Tennessee    Texas    Washington
[H3] See Authorized International Dealers
(updated Feb. 12th, 2026)
[H3] Alabama
The Amp House
87 Woods Cove Rd.
Scottsboro, AL 35768
(256)-599-3940
The Bailey Boutique
Bailey Brothers Music
105A East Bridge St
Wetumpka, AL 36092
(334)-215-0215

[H3] Colorado
Flipside Music
2231 S. Platte River Drive
Denver, CO 80223
720-519-1996
info@flipside-music.com
[H3] Connecticut
Brian’s Guitars
453 West Main St.
Cheshire, CT 06410
(203) 287-9190
[H3] Georgia
Atlanta Discount Music
3514 Chamblee Dunwoody Rd
Chamblee, GA 30341
(770) 457-3400
sales@atlantadiscountmusic.com
Humbucker Music
20 Direct Connection Dr
Rossville, GA 30741
(706) 858-6874
sales@humbuckermusic.com
[H3] Indiana
Sweetwater Sound Inc.
(1) 800-222-4700
sales@sweetwater.com
[H3] Illinois
Chicago Music Exchange
3316 N. Lincoln Ave
Chicago, IL 60657
(773)-525-7773
Music Makers
346 E. Main St.
Galesburg, IL 61401
(309)-342-0176
dave@musicmakersweb.com
[H3] Kansas
Mass Street Music
1347 Massachusetts Street
Lawrence KS 66044
1 (800) 747-9980
fax: (785) 843-4999
sales@massstreetmusic.com
[H3] Kentucky
Willcutt Guitars
419 Rosemont Garden
Lexington, KY 40503
(859) 276-0675
(ask for Eric Cummins)
info@willcuttsguitars.com
[H3] Louisiana
Cardinal Music Company
2070 Hwy 171 Suite C
Stonewall, LA 71078
(318) 775-4223
admin@cardinalmusiccompany.com
Shreveport Music Company
306 Ockley Drive
Shreveport, LA 71105
(318) 798-6000
info@shreveportmusic.com
[H3] Maryland
Island Music Company
403 Charles Street
La Plata MD 20646
(301) 392-3960
keith@islandmusicco.com
[H3] Massachusetts
Matt’s Music Center
1597 Main St
Weymouth MA 02190
(781) 335-0700
[H3] Missouri
Palen Music Center Inc.
Springfield
1560 E. Raynell Place
Springfield, MO 65804
(417) 882-7000
Palen Music Center Inc.
Joplin
1202 S Rangeline Rd #6
Joplin, MO 64801
(417) 781-3100
Palen Music Center Inc.
Liberty
340 South 291 Highway
Liberty, MO 64068
(816) 792-8301
[H3] New York
Parkway Music
1777 Rt 9
Clifton Park, NY 12065
www.parkwaymusic.com
(518) 383-0300
[H3] North Carolina
Harry’s Guitar Shop
556 Pylon Drive
Raleigh, NC 27606
919-828-4888
mike@harrysguitarshop.com
Midwood Guitar Studio
1517 Central Ave.
Charlotte, NC 28205
980-265-1976
sales@midwoodguitarstudio.com
Music Barn Inc.
920 South Chapman St.
Greensboro, NC 27403
336-272-2118
musicbarn@mail.com
[H3] Ohio
Woodsy’s Music
135 S. Water St
Kent, OH 44240
(330) 673-1525
woodsys@woodsys.com
Third Rock Music Center
1232 Eight Mile Rd.
Cincinnati, Ohio 45255
(513) 843-5739
greg@3rockmc.com
The Center of Music and Art
264 Main Street
Wintersville, Ohio 43953
(740) 264-3111
michaelanthony@musicandart.com
Guitar Guys
651 S 30th Street
Heath, Ohio 43056
(740) 522-0277
sales@guitarguys.net
[H3] Oklahoma
Barnett Music Exchange
10425 S. 82nd E. Ave Ste 107
Tulsa, OK 74133
(918) 970-4069
barnettmusicexchange@gmail.com
[H3] Pennsylvania
Brush Creek Guitars
20710 Route 19, Unit #2
Cranberry Township, PA 16066
(724) 201-1472
info@brushcreekguitars.com
[H3] Tennessee
High Voltage Guitars
210 Space Park N
Goodlettsville, TN 37072
615-931-6913
highvoltagenashville@gmail.com
[H3] Texas
The Guitar Sanctuary
6633 Virginia Parkway
McKinney, TX 75701
972-540-6420
brian@theguitarsanctuary.com
Austin Guitar House
1104 E. 12th St.
Austin, TX 78702
(512) 243-6036
sales@austinguitarhouse.com
[H3] Washington
Emerald City Guitars
83 S. Washington
Seattle, WA 98104
(206) 382-0231
jayboone@emeraldcityguitars.com
[H2] International Dealers and Distributors
[H3] Australia
Deluxe Guitars
60-66 Clarke St
Southbank VIC 3006
Australia
mail@deluxeguitars.com.au
[H3] Canada
Lauzon Music Centere Ltd
1345 Wellington Street
Ottawa, Ontario Canada K1Y 3B8
613-725-1116
shop@lauzonmusic.com
Long & McQuade Musical Instruments
722 Rosebank Road
Pickering, Ontario Canada L1W4B2
905-837-9785
L&M Toronto
925 Bloor St W, Toronto, ON M6H 1L5
416-588-7886
info@long-mcquade.com
L&M Winnipeg
1845 Pembina Hwy, Winnipeg, MB R3T 2G6
204-284-8992
winnipeg@long-mcquade.com
L&M Saskatoon
721 43rd St E, Saskatoon, Saskatchewan, S7K 0V7
(306) 664-1966
saskatoon@long-mcquade.com
L&M Calgary South
225 58 Ave SE, Calgary, AB T2H 0N8
(403) 244-5555
calgary@long-mcquade.com
L&M Vancouver
368 Terminal Ave, Vancouver, BC V6A 3W9
(604) 734-4886
vancouver@long-mcquade.com
L&M Burlington
3180 Mainway, Burlington, ON L7M 1A5
(905) 319-3330
burlington@long-mcquade.com
L&M Edmonton South
9219 28 Ave NW, Edmonton, AB T6N 1N1
(780) 432-0102
edmontonsouth@long-mcquade.com
L&M Halifax
6065 Cunard St, Halifax, NS B3K 1E6
(902) 496-6900
halifax@long-mcquade.com
L&M Langley
6339 200 St, Langley, BC V2Y 1A7
(604) 530-8704
langley@long-mcquade.com
L&M Victoria
756 Hillside Ave., Victoria, BC V8T 1Z4
(250) 384-3622
victoria@long-mcquade.com
L&M Web Sales
722 Rosebank Rd., Pickering, ON L1W4B2
1-885-588-6519
websales@long-mcquade.com
[H3] England
Peach Guitars
3 Crown Gate
Wyncolls Road
Severalls Industrial Park
Colchester
Essex
CO4 9HZ
Contact: John Priest
sales@peachguitars.com
[H3] Italy
440hz
Luciano Andrea SNC
Via Como, 18
21100 Varese, ITALY
Phone: ++39-0332-281355
Fax: ++39-0332-216609
info@440hz.it
[H3] Japan
Prosound Communications Inc. (for Japan)
Tokyo Office:
8-12-12 Akasaka
Minato-ku, Tokyo 107-0052
Japan
Phone: 81-3-3408-6007
japan@pci-jpn.com
[H3] Netherlands
Van de Haar Guitars and Parts
Edisonweg 30
IJsselstein LC 3404
Netherlands
Phone: 0031 030 6871232
[H3] Sweden
These go to 11
Kocksgatan 17
11624 Stockholm
Sweden
+46 (0)8 55903030
support@tgt11.zendesk.com
[H3] Switzerland
MusiX AG
Saeqeweg 15
4304 Giebenach
Switzerland
+41618131177
info@musix.ch
[H3] Thailand
Strings Shop
93/334 Sukhumvit 24
Klongton, Klongtoey
Bangkok, Thailand 10110
+66 80-114-4141
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[H2] Octal Six
[H5] “Put aside any notions of what a guitar amp can sound like and plug into an Octal Six!” – Dr. Z
[H3] Specifications
Power Output28 WattsOutput Tubes2 – 7591Preamp Tubes1 – 6SN7 (octal base tube)
1 – 6SL7 (octal base tube)RectifierSolid StateControlsVolume, Treble, Middle, Bass, MasterConfigurationsHead, 1×12 ComboDimensions & WeightHead: 19” W, 9 3/4” H, 9 1/2” D; 26 lbs.
1×12 LT Combo: 22 1/2” W, 20 1/8” H, 10” D; 36 lbs.OtherHi/Lo Sensitivity Inputs
Buffered FX Loop
WGS G12 C/S speakerOwners ManualDownload
[H3] General Information
One of the greatest challenges of having 36 years of amplifiers, music, and business under your belt is maintaining the spark of inspiration. Sometimes that spark jumps from the embers of Dr. Z’s oldest collaborators, so when the phone rings and Joe Walsh, legendary solo artist and guitarist/songwriter for the Eagles, is on the other line, one can be assured there is a wellspring of ideas, interests, and inspiration to be tapped.
The Octal Six is result of the 4th collaboration between Dr. Z and Joe Walsh, birthed from the need to go somewhere different, untread upon and new, then road-mapped through Dr. Z’s 36 years of experience designing and building guitar amps. Joe is no stranger to electronics, being a hobbyist HAM radio operator and having played countless amps through his storied career. He always brings a unique, informed perspective to the drawing board while sending Z down uncharted territory; the Octal 6 is no different in this regard. Yet, under the hood, this amp is uncanny in almost every other regard in the history of Dr. Z Amplifiers.
Starting with a pair of octal preamps, the 6SL7 and 6SN7, the guitar signal is amplified by these large bottle tubes that are more commonly used as power tubes than preamp, marked by a their distinctive 8-pin octal base as opposed to the 9-pin 12ax7 types seen in 95% of all other amplifiers. These are supplied with their own independent DC heater supply, resulting in extremely low noise operation in ratio to gain. The distortion signature and compression character is simultaneously smooth, yet harmonically dense with a churning overdrive texture reminiscent of the 50s Tweed amplifiers, without the mush or lack or articulation common in those more archaic designs. The Octal Six has a recognizably vintage sound with expressive, blooming compression but with a string articulation and dynamic bandwidth only these octal tubes can supply. Play-feel and volume knob clean up, even at the high-overdrive settings rival the lauded Dr. Z Z Wreck, with a delicate balance between gain and fidelity.
After Joe first suggested the 6V6 as power tube, Dr. Z found these octal tubes to be exceptionally lively in the audio spectrum and needed a power tube to match their vigorous output. Striving for efficiency in both the top and bottom of the signal, he settled on the less common 7591 power tube, the last major power tube designed before the end of the vacuum tube era and the transition into solid state transistors. These are noted for their high sensitivity input resulting in unparalleled playing dynamics, with a clean and robust output with no loss in detail, seen by hi-fi and tube aficionados as the “perfected” form of the classic 6L6 tube.
A paper-wound, vintage spec’ed output transformer manufactured by Heyboer Transformers drives the speaker, while our Mk. II style Post-Phase Inverter Master Volume offers smooth volume operation at any level. Two guitars inputs are included to optimize for the amount of clean headroom desired. Joe requested a transparent FX loop for his bevy of guitar pedals, so a buffered FX loop was included in the Octal Six.
Finally, debuting in the combo version of the Octal 6 is a Warehouse Guitar Speaker G12C/S orange basket speaker, a versatile American-voiced speaker with a very punchy, forward response and a smooth, silky top end. This is a speaker that was carefully selected through numerous candidates, and matched the distinguished quality of the Octal Six while also making in its exclusive debut in this design.
[H3] Magazine Reviews
“The Octal Six is a remarkable amplifier offering exceptional tone, feel, and versatility. Its design is a great blend of vision and creativity, and its execution is veritably flawless. Any player looking for a cool twist on their tone in a user-friendly package can confidently add it to their list.”
The Octal Six reviewed in the Dec ’24 edition of  Vintage Guitar Magazine.
Charlie WilkinsVintage Guitar Magazine
Octal Six 1×12 combo panel
[H3] Sounds
Clean
[H3] Clean
Octal Six recorded with a Shure SM57 and SE VR 1 ribbon.
Overdriven
[H3] Overdriven
Octal Six recorded with a SE VR 1 ribbon. Played by Dave Baker.
[H3] Videos
[H6] Disclaimer: while the information contained on this page is correct at the time of publication, due to our policy of constant improvement and development, Dr. Z Amplification reserves the right to alter specifications without prior notice.
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