![]() ![]() You can find the proper schematic at www. This extremely responsive and warm-sounding circuitry was then coupled with the specially voiced, ECC83 (a.k.a 12AX7) valve-driven pre-amp section, to provide 100 valve/analog warmth from read more input to. You can find the proper schematic at I know this is an old thread, but here's something to be added. Marshalls long history and experience in the field of valve amplification was utilized in the development of the new AVT power amp. NOTE: IF REPLACING THE TDA7293, BE ABSOLUTELY SURE YOU DISCHARGE ALL CAPACITORS IN THE AMPLIFIER AND ON THE POWER BOARD BEFORE REPLACING OR THE CHIP WILL BE TOAST BEFORE YOU EVEN TURN THE AMP ON! Headphone jack or the circuit from the jack to the speaker output. ![]() So if you can use headphones on these amps, then the TDA7293 is ok and the problem is in the Outputs and if it has bad connections/broken solder joints then no power will go to the speaker. Remember, the headphone jack breaks the circuit going to the speaker ![]() Headphone jack and slightly tensioned (bent) the contacts with a jack installed in it and now it works great! I replaced it, checked components on the power board, put it back together and found that it would intermittently power a cab. The effects send worked fine, no headphone output. I have an AVT50H that wouldn't power a cab. I know this is an old thread, but here's something to be added. ![]()
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