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Just my 2 cents. I had bought a 503 regular non HD. It performed very squirrelly. Power output from the amp very sensitive for what ever reason. Like 2-3 watts input would give full power and it was all over the place, and it sounded like garbage. I had converted it to a High drive and now the 503 is perfect. 4.5 watts into the amp wide open on the power output knob on the 503 and I get a full 90-100 watts on a dead key. Smooth continuous power and smooth operation. I have been running it that way for about a year as a base set up.

[QUOTE="Kristopher burt, post: 828610, member: 59606"] Just my 2 cents. I had bought a 503 regular non HD. It performed very squirrelly. Power output from the amp very sensitive for what ever reason. Like 2-3 watts input would give full power and it was all over the place, and it sounded like garbage. I had converted it to a High drive and now the 503 is perfect. 4.5 watts into the amp wide open on the power output knob on the 503 and I get a full 90-100 watts on a dead key. Smooth continuous power and smooth operation. I have been running it that way for about a year as a base set up. [/QUOTE]

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