The PRS MT 15 is Mark Tremonti's first signature amplifier. It's going to be great for someone to take it out of the box, set everything to noon, and have it sound great." - Mark Tremonti We're all blown away with how it turned out.
The challenge was getting a lot of tone and features in a little box. Bottom line, the amount of features, the hugeness of the sound, and the raw horsepower of the circuit make the PRS MT 15 an impressive lunchbox hero. Despite its 15 watts, the MT 15 sounds more like 50, so a half power switch that takes the MT to 7 watts is a welcome edition. No matter what tone you dial in, the MT 15 stays balanced across the spectrum with a sweet, smooth tone that won*t bite your head off.Īdditional features include an effects loop and bias adjusters that are accessible from the back panel for ease of servicing. The clean channel also features a push/pull boost control that adds a little … read more The clean channel is bright and chimey, good with chords and fingerstyle playing - whether with a pick or not. The gain channel gets big, chunky tone with massive, tight low end, never losing its articulate note definition or great lead tone. Like the PRS Archon amplifier, the MT 15 features five gain stages before the Master for full, lush distortion. The VT-40 doesn't have any plate resistors, so I installed precision 1 Ohm resistors between the Cathode and Ground of each 7027A power tube.īe very careful in there! Ampegs have very high (like 600 Volts!) plate voltages on the the power tubes.The PRS MT 15's design started with heavier players in mind, but in the end, it has a lot to offer players of all genres. In my VT-22, I calculate the plate current by measuring the voltage drop across the 5 Ohm plate resistors. You can also try the Discussion Board at the > Used Ampegs< website. I don't have schematics for them that I can post, but Aspen Pitman's "The Tube Amp Book" has some for several different years and models. On my VT's, the drawings are pasted to the cover which has the reverb tank bolted to it. Have you had the chassis out of the cabinet? Most old Ampegs have a schematic pasted to the chassis cover, where you can't see it until you take the guts of the amp out of the box. Your amp may have been modded by a previous owner.
I installed multi-turn trimpots in both of my amps while I had them apart to replace the old electrolytic filter caps. The bias is at -43.4VDC, and plate current is now measured at 43.8mA, which at first appears to be closer to the target suggested by the Weber Bias Calculator and the Tube Amp Bias Calculator. The bias is non-adjustable, other than by changing out one or more resistors to tweak the voltage divider circuit in the power supply. Anyway, the measured plate voltage is 420VDC, which is a little lower than the previous example. Neither of these has any test points, and the only adjustment on the rear panel is a "Hum Balance" trim for the heater filaments. The only Ampeg I know of that had test points and adjustable bias was the original SVT head.
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