If you chased through the section around the reverb connections on the PCB and posted a pic of the schematic you find it would be even easier to help. If you can post a few of the current symptoms, (burnt components, strange noises, silence?), assuming you have the reverb unit back in place and hooked up correctly again of course, someone may be able to advise. While not exactly the same in all cases you will probably find one where things are pretty much similar to your own. The reverb section in your preamp is no doubt one which is shared by a number of models past and present. You may not find the actual schematic for your own amp as it is current, they tend to prefer the older valve models, (as most of us do ), but I am betting if you are flexible in your thinking you will be able to get somewhere with what is there on the older babies. Also all Marshall AVT products, including the Marshall AVT50H, will deliver the goods in the often hostile and unpredictable environment of the live performance stage.Don't know if you have been here yet but you could try these sites, they might help as they have an astounding set of schematics for everything under the sun: Using frequency dependent power amp damping and Marshall's proprietary, dynamic clip level technology (which emulates the HT supply of a valve power amp), each AVT power stage creates the warm, musical feel and 3-dimensional sounds that have made Marshall's all-valve power amps world-renowned. Power Amp Delivery The same, unrivalled design expertise that went into the pre-amp was also channelled into the design of the AVT power stage. Very Good (Used) Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape. Whenever you select an AVT Overdrive channel, the ECC83 is saturated to its limit, providing dynamics and feel worthy of a place in the Marshall hall of fame.
The resulting clean sounds ring with the bell-like harmonics that only a valve pre-amp can deliver and the break-up is never harsh or unnatural sounding. Marshall has gone to great lengths to ensure that this precious device delivers maximum sonic benefit at all settings and volume levels. Instead it is playing the central role in the gain, distortion and tone generating circuitry. Protect your Marshall AVT50H with this affordable amp head cover will keep your gear looking great for years. Unlike other hybrid amps out there, this valve isn't merely acting as a pilot light. Valve Drive Pre-amp Every Marshall amp in the AVT line, including the Marshall AVT50H, boasts a pre-amp stage that is driven by an ECC83 Dual Triode valve. Tube Warmth & Solid-State Convenience Meets Digital Power In Marshall's quest to give players the ultimate tone at an unbelievable price, they have combined the latest innovations in valve, solid state and digital technologies to achieve optimum sonic performance in the AVT line of amps. Crank the Overdrive channel's Gain control to the max and you have a contemporary high gain sound that packs an unbelievable punch, staying tight and focused thanks to the carefully designed closed back cabinet. The AVT50H has two footswitchable channels for glistening clean tones and a roaring crunch that just oozes vintage authenticity. Marshall AVT50H - Features for Studio & Stage If you have heard that 50 watts of solid state power is not loud enough to gig with, listen again.
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