![]() ![]() Drive a Bandmaster into clipping with a fuzz pedal set on KILL, down on the 6th string where the speaker goes resonant, and you can have over 2000 volts on the brown and blue wires. The normal voltage on that brown wire is about 900 volts when the amp is playing loud, but not clipping. I dont know what to think with this one and honest am i little worried to turn it back on to check voltages at this point. Brand new ussr 6l6 equivalents the long life e model and the weren't biased yet. Im starting to supect the diodes? Could the mismatched impedenace cause this? Or is my PT junk maybe? Do you think the previous owner cause damage to it or was this the reason it was abandoned in the first place? One more thing. I hit the switch in seconds flat and once i drained the capacitors ,measured the OT resistances and choke everything seems fine, and the wire is just slightly charred where it caught fire momentarily. Played for litterally 15 seconds, reached to put the guitar down and grab my meter and sudden the insulation on the brown wire of fhe new OT caught fire.1st 6l6 tube socket, pin #3. I had a load i though was a 4 ohm cab attached to it (turned out to be 8) and guitar plugged it noodling until it warmed up and when it did tone was Inredible. I was under the impression you should be able to check voltages wothout tubes installed, is that not the case for a SS rectifier? So anyway i thought maybe that was the case(apparently not lol), and decided to install tubes to check voltages. went to check voltages without tubes installed and popped a fuse. Nbd, ill order a new and for now leave it at 4 ohm output. Got it installed, and realized my ground switch only works on one position. The amp already had a replacement OT from a bassman of the era, (as well as a NFB loop mod with a hole drilled in back for a pot )so i decided what the hell its not an original OT and everything pointed to it so i bought a classictone OT (pn: 40-18008) with 4 and 8 ohm secondarys with the intention of using the existing ground switch as an impedence switch. I tried it, and got no output whatsoever.Īt this point i checked voltages, which seemed fine, and moved on to checking resistance to ground and between windings on the output transformer, and everything seemed fine. Now for the confusing part, i did the standard procedure electrolytic capacitors, omitted the ground switch and two conductor cord, and a the resistors on the power tube sockets as they looked slightly burnt, even though they were within spec. He is not a musician and had no interest in it so he sold it to me (after pugging it in without the load of a cab and no input, blowing a fuse and getting shocked) as is for 375$ with the cab. I bought this bandmaster from a friend from high school whi just bought a house with it and a nonmatching cab in the basement. the Vibrolux sports a 50W alnico Blue Dog.Hey guys, ive been a member for a while but inly posted once regarding a organ amp, and though i havent had much time to post in here latley my confidence has grown a bit and I have done quite a few capacitor changes, power cord changes and small mods on guitar ands and converted a few tube pa amps to be more guitar friendly. My creation and a for real 1962 brown Vibrolux. Now this is a combination made in heaven. Fender quit making 40W one 12 combos in '64 (I think) probably because the power was real tough on speakers of the day. It is basically their version of the 20/25 W Celestion speakers of the 60's. I really like the Weber Blue Dog speakers in most anything. Filter capacitors under the doghouse are 20 uF Spragues. Their transformers do very well at classic Fender tones and feel. I chose Mercury Magnetics iron for this build. The amp does have a very good blackface era vibe. Their version of the vintage blue molded and yellow astrons of late 50's and 60's Fender amps. JD Newell cabinet in rough blonde with oxblood grill cloth.Ĭarbon comp resistors and Sozo vintage blue signal caps. The whole point was to recreate the 1964 AA763 non-reverb Vibrolux the blackface circuitry version of the brown Vibrolux. This is a 1967 Bandmaster chassis restored as a one 12 combo amp.
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