Speaker Codes and Implementation

This page is a collection of odds and ends information relating to speakers and speaker implementation. While it is the policy of WeberVST to not make a specific recommendation on speaker choices, you might find some of the information useful in determining which speaker would be best suited to your application.
 

Speaker Codes And What They Mean


The picture is a section of the basket rim of a speaker. The 6 digit code indicates what manufacturer made the speaker and when it was made. It is called the 'Manufacture Date Code'.

Here is a list of some of the speaker manufacturers and their EIA codes:


Credence   117       Pyle   1098     Rola      285    Eminence         67       
CTS        137       EV      649     Oxford    465    Altec/Lansing   391 
Utah       328       Quam    270     Jensen    220    WeberVST       1279
Cleveland  433
More Speaker Codes Codes for Manufactures of Other Products

So, the speaker in the image above would have been made by Jensen (220) during the 27th week of 1951 or 1961. The year is confusing because it is only a single digit. In later years, the EIA converted to a 4 digit date code so the year could be easily identified. There are 2 acceptable methods of displaying the EIA date code, with or without a hyphen between the manufacture code and the year/week code. Some manufacturers also attached other letters to the end of the date code to indicate day of the week, work shift, serial number, lot number, etc. The EIA only specifies manufacturer and year/week code. Anything else is at the discretion of the manufacturer.

Speaker Implementation and Amplifier Configurations
If you would like to add some info to this list, (any company, any model) feel free to write us with the info. Thank you.
Amp ModelAmp ConfigSpeaker ConfigurationReplacement Speakers
Ampeg Gemini I
'64-71
2-7591
Cath Bias
20W
1-12", 8 Ohm
Jensen C12Q, C12N
Jensen EM1201
JBL D-120F
12A125, 12F125
12A150, 12F150
Ampeg Gemini II
'65-71
2-7591
Fixed Bias
30W
1-15", 8 Ohm
Jensen C15N, EM1500 or EM1502
JBL D-130F
15A150, C15N
Ampeg Super Echo Twin
'63-64
4-7591
Fixed Bias
30W mono
15W per side
2-12", 8 Ohm
Jensen C12Q or EM1201
12A125, 12F125
Ampeg B15N
'61-67
2-6L6
Cath Bias
25W
1-15", 8 Ohm
Jensen C15N
Cleveland, CTS sq mag.
Altec, JBL D-130F
15A150, C15N
Ampeg B15N
'67-79
2-6L6
Fixed Bias
30W
1-15", 8 Ohm
Jensen C15N
Cleveland, CTS sq mag.
Altec 421-A, JBL D-130F
15A150, C15N
Ampeg Jet
'57-63
2-6V6
Cath Bias
12W
1-12", 8 Ohm
Jensen P12R or P12S
12A100, 12F100
Ampeg Jet
'63-69
2-7591
Cath Bias
15W
1-12", 8 Ohm
Jensen C12R, CTS AlNiCo, Quam
12A100, 12F100
Ampeg
Reverberocket
'61-63
2-6V6
Cath Bias
15W
1-12", 8 Ohm
Jensen P12S, P12R, C12R
12A100, 12F100
Ampeg
Reverberocket
'63-68
2-7591
Cath Bias
15W
1-12", 8 Ohm
Jensen C12R
or CTS
12A100, 12F100
Ampeg
Reverbojet
'67-69
2-7591
Cath Bias
18W
1-12", 8 Ohm
Jensen C12Q, CTS AlNiCo
12A125, 12F125
Bandmaster, Tweed
'53-55
2-6L6
Cath Bias
25W
No -fb
1-15", 8 Ohm
Jensen P15N
15A150, C15N
Bandmaster, Tweed
&
Brown
'55-60
2-6L6
Fixed Bias
30W
3-10", 8 Ohm
Jensen P10R or P10Q
10A100, 10F100
10A125, 10F125
Bandmaster, Blonde
'60-63
2-6L6
Fixed Bias
40W
2-12", 8 Ohm
piggyback
Oxford 12M6-4
Jensen C12N
12A125, 12F125
12A150, 12F150
Bandmaster, White
'62
2-6L6
Fixed Bias
30W
-fb
2-12", 8 Ohm
piggyback
Oxford 12K5R-1
12A125, 12F125
12A150, 12F150
Bandmaster, Black
&
Silver
'63-74
2-6L6
Fixed Bias
40W
2-12", 8 Ohm
piggyback
Oxford 12T6
Jensen C12N
12A125, 12F125
12A150, 12F150
Bassman, Tweed
'55-'58
2-6L6
Fixed Bias
30W
-fb
4-10", 8 Ohm
all in parallel
Jensen P10R
10A100, 10F100
Bassman, Tweed
'58-'60
2-6L6
Fixed Bias
40W
-fb
4-10", 8 Ohm
all in parallel
Jensen P10R or P10Q
10A100, 10F100
10A125, 10F125
Bassman, Brown &
Blonde
'61-'62
2-6L6
Fixed Bias
40W
-fb
2-12", 8 Ohm
Jensen C12N
Oxford 12M5-6
12F150, 12A150
Bassman, Black
'63-'67
2-6L6
Fixed Bias
40W
-fb
2-12", 8 Ohm
in parallel
in piggyback, sealed cabinet
Oxford, Jensen, Utah
12A150, 12F150
Chicago 12,Texas 12
Bassman, Silver
'67-'68
2-6L6
Fixed Bias
40W
-fb
2-12", 8 Ohm
in parallel
in piggyback, sealed cabinet
Oxford, Utah
12A150, 12F150
Chicago 12,Texas 12
Bassman, Silver
'68-'80
2-6L6
Fixed Bias
40W
-fb
2-15", 8 Ohm
in parallel
in larger piggyback, sealed cabinet
15A150, 15F150
Chicago 15,Texas 15
Bassman, Silver 10
'72-'82
2-6L6
Fixed Bias
40W
-fb
4-10", 32 Ohm
in parallel
or 8 Ohm series/parallel
10A150, 10F150
Chicago 10,Texas
wired series/parallel
Champ, Tweed
'53-'55
1-6V6
Cath Bias
5W
No -fb
1-6", ? Ohm
Cleveland or Jensen P6T
-
Champ, Tweed
'55-'64
1-6V6
Cath Bias
5W
-fb
1-8", 3.2 Ohm
Oxford, Jensen, CTS P8T
-
Champ, Black
'64-'67
1-6V6
Cath Bias
5W
-fb
1-8", 3.2 Ohm
Oxford 8EV
-

NEXT PAGE


Note: Company names and product identities are presumed trademarks of their respective companies and are used only in the context of providing information of interest to the general public. WeberVST neither endorses nor depreciates any product or company mentioned other than WeberVST and its products.


Content © 1996-present Weber Vintage Sound Technology