B-25-B bass amp were 2 channel 55 watt models, each driving a 2x15 cabinet. Until such time that enough information is available to date 1970s Ampegs by serial number, the features of the amps from this period can be used and compared to the following table. Offered for sale Used c1969 Ampeg B-25 Amplifier head serial number 07656. An added variable is that during the Magnavox years, Ampeg may have used separate serial number systems for each model or for models that shared the same chassis like the VT-22 and V-4. For over 60 years Ampeg has been providing amplification solutions for professional bass players and aspiring bassists looking for the best bass practice amps. Not enough information was available to the authors to determine year of manufacture by serial number. Ampeg is a Bass amp instrument manufacturing company that specializes in bass guitar amplification and effects. 1970 through 1979 The third serial number system was implemented in 1970. The third serial number system was implemented in 1970. I was also told that this had the common speaker upgrade many people did later in the 60s and early 70s by putting the better, later 60s models speakers in. the date code to indicate day of the week, work shift, serial number, lot number, etc. From what Ive been told about the serial number this is a very early early cabinet. That's an older version if it has four rocker switches for frequency and no "distortion channel. Here is an early 60s Ampeg B-15N cabinet.
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