![]() I have never seen this arrangement and I googled it, and became aware of "mixed" bias. I am measuring 4VDC across one 150E resistor and 3VDC across the other. Home » Fenderbandmasterab763schem Fenderbandmasterab763schem. I don't know the value of the Ecap values are facing chassis and I haven't removed anything to check it. With a rather large Ecap across both cathodes. The power tube cathodes each have a 150E 7W resistor to ground. Im getting -48VDC on one grid and -44VDC on the other grid. The wiper of the pot feeds the other 100K to other 6L6's grid. Off of the junction of the 10K, 100K to the 6L6 grid there is another 10K back to lug 1 of the bias pot. Off of that lug there is a 10K resistor going to the summing resistor (100K) as per schematic. Here is another couple shots of a filter supply. For instance, this is a Weber Deluxe Reverb kit photo. Reverse rectified and sent to lug 3 of 10K pot. Just look at pictures on the web and between that and the schematic shouldn't be any problem with the way they are wired. Here is a brief description of Bias wiring. All preamp stages have 10uF cathode bypass caps. It has a replacement Bandmaster PT and has been almost entirely redone passive wise to stock. Normally this amp has a bias balance circuit for the fixed bias arrangement. The production date code for the amplifier.I have a repair for a friend in the shop and am a bit stumped on the "mixed" bias configuration I found it in. The last line will have 2 letters of theĪlphabet either printed or written by hand. "sign-offs" at the completion of sound and electrical tests, Is a Black and Silver label, which contains several lines for Which may be found on the back of the amp chassis. This code is located on the "QA" (Quality Assurance) sticker, Manufactured after 1989 include a date code on the amplifier. An example would be: EIAĦ06-4-21 would mean the 21st week of 1964. The last twoĭigits would refer to the week of the year i.e. If four digits are present, the first two digits Present, the first digit would refer to the year i.e. Numbers always begin with "606", and are followed by three orįour digits in various combinations. Transformers may help you to determine the date of production onĪmps that fall between the different dating schemes. These codes are for amps with the serial number beginning with a Therefore, if you have a push-pull pot, your amp is 1974 or newer.Īmps do not have a date code stamped on the tube location chart. The multi-speaker amps, the Tremolux, Band-Master, Concert, Super Reverb. A push-pull pot was added to some amps in 1974. The Deluxe Reverb schematic and layout below have been annotated with.In 1973, Fender removed the "Tail" from the logo.Making them a little less desirable than the blackface amps.Ī good amp tech can make these sound great. Silverface Amps began in 1968, when Fender made circuit changes to most amps, List your Fender Black Panel Bandmaster 40-Watt 2-Channel 2x12' Piggyback Guitar Amp 1963 - 1967 today to get it in front of thousands of eyes, quickly and easily. Interest-free available, starting at 116/month. Silverface amps with aluminum trim surrounding the grill cloth are 1968 models Fender Bandmaster AB763 Head and 2x12 Cabinet 1965.Fender Blackface amps & early Silverface amps used cloth covered wire." Pre-CBS" Blackface Original Amp Knobs have the set screw at the number "10".Early Fender Electric Blackface amps from 1964 and some into early 1965ĭid not have a Fender Logo on the grillcloth." Pre-CBS" Blackface Amps are labeled "Fender Electric Instruments".Īfter CBS bought Fender in 1965, amps were labeled "Fender Musical Instruments".Serial number that is stamped on the right rear of the chassis Here is a list of the first letter showing the year of An amp stamped NA would have been made in Jan. This information is not for commercial use,Īnd cannot be copied, posted, pasted or otherwise used in anyĪmp)- the first letter is the year, and the second letter is the Dating, Speaker code & Tube Information Superior Music - Fender Amp, Amplifier Serial Numbers
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |