Speaker Codes, Amps, & More

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 Model Amp Config Speaker Configuration Replacement 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 -

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 Model	Amp Config	Speaker Configuration	Replacement 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	-

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.