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info    updated 7/9/2010

Jack Daniels

Jack Daniels brand amplifiers are built by Peavey since 2004.

Jackson

Jackson offered guitar amplifiers in 1970s and 1980s. Some were made in the UK.

Example http://www.chambonino.com/work/miscguitar/misc3.html

Reviews are at Harmony Central

Images eBay:

Jackson Ampworks

Since 2003. Brad Jackson makes tube amps in Bedford, Texas.

Reviews are at Harmony Central

Jackson - Guldan

Jackson-Guldan Violin Company, Columbus, Ohio 1920s-1960s

Jacques

Jacques effects

Reviews are at Harmony Central

Jade amps

Australian manufacturer of amps since 1970.

"Started 1970. Still make amps in Melbourne.  Early models had Year/Month serial stickers or printed numbers of engraved numbers.

eg. 75322 would be MARCH 1975 No.22.

Since about early 80's we stopped using serial numbers." [Source: Joe Bonich, Jade Amps, email 13/10/2008]

Reviews are at Harmony Central

Jaguar

Henry Clift, Jaguar Amplification, made in USA

Jake Amps

"I started manufacturing in 2009,  In Argentina.

Dating Jake Amps

By the serial number. I have a record for every amp I did. [Source and images, Eric Jacobs, Jake Amps, Quilmes, Argentina]

Argentina

Jamison

USA made. Date of manufacture is on the serial number sticker.

Reviews are at Harmony Central

Image Jamison web

Jansen

Jansen amplifiers were made For Brent Distributors, Made in Auckland New Zealand by Beverley Bruce & Goldie Ltd.

http://www.milesago.com/industry/jansen.htm

Image Jansen amp eBay:

Jason

see Guitars for info on Jason brand.  Images eBay

TC Jauernig

Tim Jauernig.  From the guitar pug review it looks like TC Jauernig pedals are dated inside.

Reviews are at Harmony Central

http://www.guitarpug.com/2008/06/pedal-review-tc-jauernig-electronics-gristle-king/

Images courtesy of North Coast Guitars

Jay Turser

see T for Turser

JazzKat

JazzKat amps

JCA Circuits

Since 2006. Jason Arthur, Pottstown, Pennsylvania.

The JCA Circuits GR 1.6 "Golden Ratio" Amplifier is the first amplifier offered. I have plans and am presently working on another amp design TBA. The GR was introduced in January 2006.
I hand build each GR here in my shop in Pottstown, PA, USA--they are designed, built, and sold by one guy--me. There are no compromises in myshop. I sign and date the interior chassis of each amplifier I create."

[Source: Jason C. Arthur, Owner/Designer, JCA Circuits Amplifiers email 5/2/2009]

Reviews http://reviews.harmony-central.com/reviews/Guitar+Amp/brand/JCA+Circuits

J Design

J Design make guitar speaker cabinets in Millville, California. USA

Image eBay:

Jedamp

Hand made in Loveland, Colorado

Image ebay:

Jen

Jen guitar effects pedal were made in Pescara, Italy.

Reviews are at Harmony Central

Image eBay:

Jennings

see JMI

Jenkins

Jenkins Sound Shop, owned and operated by Doug and Debbi Holt. Located in Northeast Mississippi. Developed a line of cabinets utilizing a high quality Birch veneer core ply-wood with a 1/2” baffle board dadoed into the inside perimeter of the cabinet. Though very labor intensive compared to traditional methods this design ultimately contributes to produce a very lively and dynamic sound. Since the introduction of the original JSS212 in 1996 to our latest addition to the line, the Highway 61, we have tweaked and improved these unique designs to offer some of the best sounding cabs available on the market. [Source: Internet archive]

Reviews

Jensen speakers

Jensen speaker catalogs

1949-1954 http://www.hifilit.com/hifilit/Jensen/Jensen.htm

Reviews are at Harmony Central

Image cdanjo

Manufacture date code 220517.  220 = Jensen. It then gets hard with 3 digit codes. the 5 means either 1955 or 1965, 17 = 17th week of that year.

Jet City Amplification

Founded 2009.

Jetter

Jetter make effects in USA.

Dating Jetter Pedals

The first Jetter Gear pedals went on sale in 2006.The serial number tells the year/month. All recent (last two years) have the year then month format that are the first four numbers of the serial number--YYMM...Prior to that, month might precede year but there are some with the current format as well. [Source: Brad, Jetter, email 8/9/2010]

JFL Amplification

Jean-François Laplante, Vaudreuil-Dorion, Quebec, Canada

Jim Kelley

click thumb

Jim Kelley amplifiers "were made between 1978 and 1985.

The amp shop was in Tustin, California, and the cabinet shop was at my dad's house in Upland, Ca. The company name was Active Guitar Electronics, the amps were Jim Kelley Amplifiers which is now trademarked.
Dating Jim Kelley amplifiers

The prototypes were all made in 1978 and early '79 had the name Fortune on the nameplate. Serial numbers starting with 9 were made in 1979. All the others, beginning in 1980 started with zero. There may be a handwritten tag
inside the chassis with the name of the person who wired the amp, and perhaps the year. I wired the prototypes, and either Suzie, Christina, or Pam wired all the rest. They were all very good at it.
[Source and images courtesy of Jim Kelley, email, 5/2/2009]

Jim Kelley schematics

http://www.schematicheaven.com/post70s.htm

More information, catalogs, schematics and photos at Jim Kelly amplifiers tribute site

Reviews are at Harmony Central

JMF

JMF Electronics, a company founded by Jon Flickinger in 1976. The Spectra-series is from the early eighties. The company was sold to Dean Markley who also introduced Spectra–series of amplifiers. [Source: Music Electronics Forum]

JMF Schematic

Reviews are at Harmony Central

Image Gravity Strings:

JMI
Jennings Musical Industries

 Jennings built Vox amps from 1958  to 1969.  [Source and more info: Vox Mods

Brand reestablished in 2004.

Reviews are at Harmony Central

Image eBay:

Images of JMI logo at left and serial plate below are also from eBay but are from modern JMI versions.

Johnson

Johnson British Amplification, Made in London, England.  1970s. At least made a 5 watt tube amp combo.

Johnson

Johnson Musical Instruments since 1993. Solid state amps.  Johnson is a division of The Music Link in the U.S.A., and a division of A.X.L. Corp. in international markets.

Johnson Amplification

http://tone-lizard.com/Johnson_Amplifiers.htm

http://www.fenderbronco.com/id14.html

Johnson Amplification catalogs

Johnson 2000 full line catalog

Reviews are at Harmony Central

Image eBay:

JoMama

Since 1994. Joe Kelemen, Santa Fe, New Mexico, USA makes JoMama and Kelemen brand tube amps.

Reviews are at Harmony Central

Jones

Don Jones builds amplifiers n Kannapolis North, Carolina, USA

Reviews are at Harmony Central

Image eBay:

Jordan

click to enlarge

The Jordan amplifiers (and pedals) were supposedly manufactured between 1966 - 197x in Pasadena, California after which the company was disbanded and most of the technical crew including George Cole (the owner) and Bob Garcia (chief engineer) went to work for Rickenbacker. [Source: SS Guitar]

Jordan amp catalogs (paid)

http://www.vintaxe.com/catalogs_ampgear_jordan.htm

Jordan schematic

Reviews are at Harmony Central

Images eBay

Images 1966 Jordan Boss Tone one of the first distortion effects ebay:  Not sure if this is the same company as the amp one. Jordan electronics, A division of the Victoreen Instrument Co Alhambra California, Made in USA

Jugg Box

Japan made by Nihon Hammond Ltd

Example 1976 Jugg Box amp

Jugg Box amp catalog

http://guitar.webinjp.com/70guitar_catalog/juggbox.htm

Images Yahoo Auction

Juke

Since 1989. G.R. Croteau makes tube amps in Troy, New Hampshire. Also Warbler brand.

Reviews are at Harmony Central

Image eBay:

Jule

Jule amps Santa Cruz, California USA

Jule amps, made since "2001, Santa Cruz, California, USA

Dating Jule Amps
Date is written on bottom of gear." [Source: Jule Potter, Jule amps, email 10/10/2010]