Vintage Marshall advertisements; 20 adverts covering a period of 13 years, from 1966 to 1979. Click the images to have a closer look.

Beat Instrumental Polls 1966
Marshall Amplifiers - 1966

Now it's Marshall "200"
Marshall Amplifiers - 1966

Tiles - exclusively Marshall
Marshall Amplifiers - 1966

The Sound Of Sucess
Marshall Amplifiers - 1967

The 'Marshall Sound' is Getting Around
Marshall Amplifiers - 1967

The 'Marshall Sound' is Getting Around
Marshall Amplifiers - 1967

The Sound of Success
Marshall Amplifiers - 1967

Top Singers - Top Groups Top Sounds By Marshall
Marshall Amplifiers - 1968

All Right, You Guys. So Impress Me
Marshall Amplifiers - 1969

You're Not Just a Pretty Face, Baby
Marshall Amplifiers - 1969

Hit the Road, Jack
Marshall Amplifiers - 1969

Food For Thought. Vanilla Fudge. Grapefruit. The Toast.
Marshall Amplifiers - 1970

This is How You Look to the A&R Man
Marshall Amplifiers - 1970

The Sound Bouncer
Marshall Amplifiers - 1970

Marshall Law 1 & 2
Marshall Supafuzz - 1970

Let em hear it like it is
Marshall Amplifiers - 1971

Hear No Evil
Marshall Amplifiers - 1971

The Marshall Winter Collection
Marshall 1959 - 1973

Power Zone
Marshall Amplifiers - 1973

Rose-Morris Marshall
Marshall Club and Country 4140 - 1979
1967 Epiphone Ad featuring a psychedelic fish playing an Epiphone Riviera
1967 Fender Ad - Full Colour Sound
1973 Fender Stratocaster add - The Worlds Favourite Flying Machine
Guitar makers have advertised in music magazines such as Down Beat, Guitar Player and very many more. Some manufacturers advertised widely (Guild, Gibson, Fender) but many more didn't and adverts are few and far between. Here are some of my favourite ads out of the ones i've seen. You can browse through all the images from the category links above, or by manufacturer from the links below.
AMPS
Ampeg, Leslie,
Marshall, Orange, Peavey, Sunn
GUITARS
Epiphone,
Fender,
G&L,
Gibson,
Gretsch,
Guild,
Hagstrom,
Harmony,
Martin, Music Man, Rickenbacker,
Vox