• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Half a bee Philosophically. . . Er sorry Its actually about ECC83 amps

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PhoenixFL

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Joined 2004
#1
OK! I'm making my own guitar amp, Using ECC83 Valves in the Pre-amp and a TDA7294V Power amp chip (100w 8 ohms.) I've been using marshall JTM45 and 1959 Schematics from http://www.marshallschematics.com so I know basically how to make a simple 2 channel pre-amp with gain. . . Well. . . Distortion. . . Or something. . . 3 band EQ, volume, etc on each channel. Basically, I found out that the ratings for the ECC83 heaters are 6.3v or 12.6v. Well, What i want to know is if I actually HAVE to feed 300v into the amp or whether I can run it as a lower voltage pre-amp. I'm not looking to beat the JCM800, Just make a decent sounding 100watt hybrid head. And dont tell me what I want to do is stupid, or to use all valve, or a diiferent chip, I know what I want to do ok? So just leave that lot alone ok 😉
 
#2
Yes, you will need 300V, or so, for the HT. Bear in mind, though, that you don't need much current for ECC83, so it's not a major issue to duplicate the entire pre-amplifier from a classic guitar amplifer, and feed that to your chip.
 
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