Modifying drive channel in marshall avt 50h
- #Modifying drive channel in marshall avt 50h full
- #Modifying drive channel in marshall avt 50h series
Notable bands that use or have used the Marshall 8100 Valvestate include: Not only does the 8100 produce thick low end power chord distortion, the 8100 can also deliver rich and vibrant cleans to British gritty crunch. The 8100 Valvestate incorporates a ECC83 (12AX7) hybride tube technology, which helps push this behemoth amplifier into overdrive, delivering its raw power and shear tone. Needs more footage and voiceover, but illustrates the difference in Bill's input ideas, and how quickly this comes to clipping.Marshall 8100 Valvestate is easily one of the most underrated Solid State amplifiers ever to be built. I have some video up HERE if anyone's interested. Which I find pretty well approximates "average" pickup levels. This all with a 100 millivolt input sighal.
#Modifying drive channel in marshall avt 50h full
My 50 is the same, full power almost immediately. This '85 is putting out 100 watts before the Volume pot hits 2. If someone has some good beer, fine wine or excellent sippin' whiskey, certainly they would be more than welcome to attend as well!Īnd you are correct again about the LOUD part. I have a decent old Paul and a '71 50 watt, if you have a fine old Strat maybe we should get together sometime. Now, can this be balanced out with the individual Volume controls? That would require subjective listening tests and could keep us busy all day long. Since I have a 4 Input on the bench I did a quick test, and lo & behold YOU ARE CORRECT SIR! There is a measurable difference in the signal each channel "sees". I must admit the engineering side of brain was working when I read your post, 'cause I immediately thought "the signals are exactly the same".
#Modifying drive channel in marshall avt 50h series
I've been working on a video series of "Classic" Fenders and Marshalls for my web site. I guess that's why the manufactures get away with selling "classic" "historic" "vintage reissues" that are anything but reissues of Having played Fenders since 1966 and scoring my first 100 stack in '71, I forget we don't always share the same experiences To make working circuits available to amp manufacturers. It was common practice for tube manufactures/distributors Which is, I believe, a Western Electric (Bell labs) circuit. (this would be the 100 watt Super Lead Plexi) Marshall circuit, which is itself a modified so-called '59 Bassman. The test suject is a 1985 4 Input JCM 800, labeled 1959 on the chassis, that evolved from the "classic" 1959 Jumping C1 J2 to C2 J2, you experience a more significant loss. When you Input to C1 J1, jump Chan #1 jack #2 to Chan #2 jack #1, you experience some signal loss.
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The inputs being labelled Inputs I and II. Injecting at C1 J2 yeilds 50mv on the V1b grid.Ĭhan 1 would be the "bright" or I think Marshall called it "High Treble" channel in the catalogs, although on theįaceplate it is just Volume I and Volume II. Injecting a 1kz 101mv test signal into C1 J1, I measure 100mv at the V1b grid. In effect a 136k pot turned halfway down. Plugging into Jack #2 (the lower jack) shorts the 1meg resistor to ground placing one 68k to ground, AFTER the other 68k, Resistance) AFTER the 1meg resistor to ground. Plugging into Jack #1 (upper jack on 4 input Marshall) puts the signal through the 68k resistors in paralell (net 34k This applies to all 4 input Marshalls and most 4 input tweed era & black/silver face Fenders.Įach channel has a 1 meg resistor to ground then two 68k resistors (1 from each jack) to the grids of V1.