G-Ge | Gi-

info    updated 19/12/2011

Gibson

Observes that "Gibson serial numbers stamped onto amp chassis seems to be quite random and therefore possibly meaningless"   http://hem.passagen.se/ekabjan/Amps/Intro.htm

but more info here:

http://www.superiormusic.com/page199.htm

Gibson Gold Tone amp dating http://www.gibson.com/en-us/Support/SerialNumberSearch/

Product code/production number/quarter and year made

http://hem.passagen.se/ekabjan/GibsonAmps.htm

http://www.harmonicamasterclass.com/vintage_amps.htm

Skylark http://www.angelfire.com/blues/rockinjohn/skylark_ga_5.html

Gibson wiring diagrams / schematics

http://www.gibson.com/en-us/Support/TechSupport/Wiring%20Diagrams/

http://www.freeinfosociety.com/electronics/schempage.php?cat=1

http://www.drtube.com/guitamp.htm

Gibson amp catalogs http://www.gibson.com/Files/Downloads/PDFs/GoldTone/GoldtoneCatalog.pdf

1958-1970 http://www.vintageguitars.org.uk/catalogues.php

2002 Super Goldtone Catalog

Gibson amplifier books

Gibson Amplifiers 1933-2008: 75 Years of the Gold Tone

Reviews are at Harmony Central

Image of Gibson amp on the right is a 1952 Gibson Les Paul amplifier from eBay.

Gibsonette

The Gibsonette was made by Gibson from '54 to '61. At first it was a tweed, then a two tone by '60. It has one-10 inch speaker, 2-6V6s, a single 12ax7 and a rectifier tube. It turns out about 9 watts. [Source: Birds and Moons Forum]
Gibsonette amp schematics

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

Reviews are at Harmony Central

Image 1950s Gibsonette eBay:

Ginelle

Since 1996, by Rick Emery, West Berlin, New Jersey.

Giulietti

Giulietti Accordion Company.  Amps appear to be made by Magnatone and Ampeg.  Circa 1950s& 1960s.

Reviews are available at Harmony Central

Image Giulietti harp amp and right 1956-57 amp eBay. The reverse side speaker is from the amp on the right.

Glass Man Tube Amps

Glass Man handmade tube amps from Fort Wayne, Indiana USA.  Owner Jerry Glass.

Glockenlang

Amps made in Herford, Germany.

Godlyke

US effects distributor founded by Kevin Bolembach starting with Guyatone in 1998 and others including Bixonic. [Source: Music Gear Resource]

Goldentone

Goldentone amplifiers were made in Melbourne, Australia by Rose, Morris. The best resource for Goldentone amplifiers is Ozvalveamps.

Premier Guitar article

Goldentone schematics

Images below and left 1967 Goldentone model 1742 40-watt "Lead" Reverbmaster amplifier

Gollehon

Gollehon was a PA manufacturer in the 1968-1988. Company was run by John Gollehon, Grand Rapids Michigan [Source: Gollehon Books]

Image on right ebay - click to enlarge

Gomez Amplification

"Gomez Amps began in 2005.
Rancho Santa Margarita , California (southern California )

I place a hand-written ink serial number on the chassis and the tube chart on each and every amp.

No date code, however it is recorded in the test data per amp. The customer can always request that but I have yet to have anyone do so." [Source: Dario Gomez, email 16/1/2009]

Reviews are at Harmony Central

Goodmans

Goodmans speakers were used in Orange Matamp in late 60 early 70s.   They were made in Wembley, England You can see from the labels below that a date label is placed on the magnet.

Goodsell

Goodsell Electric amplifiers made in USA.

"All of the amps are/were made in Atlanta, Georgia.  The first numbered Super 17s were made in my Hammond organ shop in the Summer of 2004.  Serial #0001 belongs to producer Brendan O'Brien and has been featured on numerous recordings made at Southeren Tracks Studios in Atlanta.  Serial #0002 is in Australia with Randall Waller, who was over here playing guitar with Shania Twain at the time.  The first 100 had a large aluminum serial plate on the back with model information.  The earliest of these were identified as "Clairmont Super 17" on the plate, manufactured by Numerous Complaints Music, LLC.  These were replaced by a similar-looking plastic plate, though it was now identified as Goodsell Electric Instrument Co.  with blank white squares for the model name and serial # to be filled in with a Sharpie as each one was made, so there were 17s, 22s, 33s, and 44s made with that plate until roughly s/n 0200, when they were replaced by a non-model specific pre-numbered vinyl sticker, with the now-familiar "Goodsell" script logo in maroon on a white background with black text.  The vast majority of these were Super 17 Mk2s and 33 Customs.  This was the scheme until s/n 0500, used up until mid- 2008." [Source: Richard Goodsell, email 16/1/2009]

Reviews are at Harmony Central

Gorilla

Since 1980s. Gorilla are solidstate entry level amps distributed by Pignose, Las Vegas, Nevada, USA

Reviews are at Harmony Central

Image eBay:

GoudieFX

"I've been manufacturing since 2005 and I sign/date the inside of all the pedal." [Source: Russell, Goudie FX, email 19/3/2008]

http://en.wikipedia.org/wiki/GoudieFX

Reviews are at Harmony Central

Goya

Mainly a guitar firm but some amps and effects  from the 1960s. The best Goya resource with some information on Goya amps.

Goya Boom Box  Bass Booster schematic

Images Goya attache amp eBay:

Granger

Granger Amplification was founded by Curt Granger, who personally built all the amps until mid-2010. Made in Birmingham, Alabama. Voltage readings kept on file for all amps.

Dating Granger amps

Early amps had serial number format RCG00nn stamped onto chassis. Serial number format changed to model/2-digit year/number around mid 2008.

Example: M50-09001 (M50 #1 of 2009). Serial number stamped on metal serial number plate and affixed to chassis

[Source: Curt Granger, email 4/12/2010]

Grant

http://www.locobox.com/grant.html

Grampian

http://www.vintagehofner.co.uk/britamps/restof.html

http://www.gargantuansound.com/done/Grampianx.html

http://www.gbaudio.co.uk/data/grampian.htm

Greco

http://tix.gozaru.jp/stompbox.html

Image Yahoo auction:

Greedtone

All Greedtone gear is built by hand in Seattle, WA, USA

Green

Green amps have been made since 1993. Line by Matamp, England.

Matamp history

Reviews are at Harmony Central

Greene Pedals

Since March 28, 2000. Schematics for this range of pedals are available at the web site.

Greene Axis Fuzz schematic

Reviews are at Harmony Central

Greer Amplification

Greer amps since 1999. Tube amps and effects by Nick Greer, Athens, Georgia, USA.

Reviews are at Harmony Central

Image eBay:

Gregory

1950s-1960s. Private brand made by Harmony. [Source: Official Vintage Guitar Magazine Price Guide]

DIY Guitarist

Gregory Mark X schematic

Reviews are at Harmony Central

Image Gregory Tiger amp ebay

Gremlin

Gremlin amps - solid state Made in the USA by MIDCO International Effingham Illinois

Dating Gremlin amps

Last 2 digits of 4 digit stamp above the internal label are year of manufacture.

Images eBay:

1979 Gremlin GA10 amp

Gretsch

http://gretschpages.com/amplifiers/

Gretsch amp Catalogs

1968  http://www.vintageguitars.org.uk/catalogues.php

2008 Gretsch catalog

2008 Gretsch Price List

Gretsch schematics

http://www.freeinfosociety.com/electronics/schempage.php?cat=1

Gretsch schematics

Reviews are at Harmony Central

Image Jedistar taken at Chicago Music Exchange 2008:

Groove Tubes

Since 1986 have made amps, San Fernando.

Reviews are at Harmony Central

Images Groove Tubes Soulo amp ebay

Guild

Guild was founded in 1952 and offered amps in 1960s to 1980s. Guild effects made by Color Sound.

http://www.ggjaguar.com/guild.htm

Guild schematics

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

http://analogguru.an.ohost.de/

Reviews are at Harmony Central

Images eBay:

Guitam

5 watt Class A Valve with 1x12" Hepner 1950's Alnico speaker. Hand Made in Melbourne. 6SJ7 preamp tubes. 6V6 power amp valves

Images & info Music Swap Shop

Guitar Research

Guitar Research guitar amp - Made in China

Images ebay:

Gunn

Gunn amplifiers were made sometime in the 70's ? to early 1980s in Auckland, New Zealand by Gunn Electronics. They made heads, cabinets and combos.

Reviews are at Harmony Central

Image eBay:

Guttermouth Electronics

Forum Exile Central

Guyatone

Since 1933 offering amps from late 1940s.

Amp

http://www.vguitar.org/features/gear/details.asp?AID=3006

http://tix.gozaru.jp/amp.html

1979 Guyatone Catalog http://brochures.yokochou.com/guitar-and-amp/guyatone/1979/index.html

Effects

http://www.locobox.com/guyatone_box.html

http://www.vguitar.org/features/gear/details.asp?AID=3006

http://tix.gozaru.jp/stompbox.html

Guyatone Catalogs

1979  http://brochures.yokochou.com/guitar-and-amp/guyatone/1979/index.html

1977 + ? http://ushigomepan.cool.ne.jp/darkend/catalogue.html

http://ushigomepan.cool.ne.jp/effect/catalogue.html

Reviews are at Harmony Central

Guyatone Zip ampifier image pics Yahoo auction:

Guytron

Guytron Guitar Amplifiers, started in 1995 by Guy Hedrick Columbiaville, Michigan, USA.  Now owned by GDS Amplification LLC, based in Fenton, MI.  Serial numbers are simply sequential with no indication of year of manufacture. 

http://www.guitaramplifiermagazine.com/pub/2005/premier_issue/guytron-gt100.html

Reviews are at Harmony Central