Rolls RP220 owner manual Operation, Inspecton, WHY Tubes

OPERATION

MICROPHONE INPUT EXAMPLE

Connect a microphone to one of the XLR inputs located on the rear panel. If the microphone is a condenser type, press in the +48V phantom power switch. Connect the output to a mixer or recording device. Speak into the microphone and adjust the GAIN control for a signal level just below the point at which distortion occurs. Adjust the VOLUME control for the desired output level.

LINE INPUT EXAMPLE

When mixing down tracks from a digital multitrack recorder, the RP220 may be used to "warm-up" the final mix. Connect the multitrack to a mixer, and connect the mixer to the line inputs on the RP220. Connect the outputs of the RP220 to the input of your mixdown deck or other two- track recording device.

Set the GAIN and VOLUME controls as indicated in the Microphone Input Example.

INSTRUMENT INPUT EXAMPLE

Connect an instrument such as a guitar or bass guitar to an input of the RP220, and connect the output to a mixer or recording device. Play the instrument and adjust the GAIN control for a sound to your liking. Note that the RP220 can be overdriven to provide a slightly distorted signal, which may be desired. Adjust the VOLUME control as indicated in the Microphone Input Example.

NOTE: These are just suggested settings. Your applications may require different procedures for setup.

BLOCK DIAGRAM

250V 250V

Congratulations on choosing the Bellari RP220 Studio Tube Preamp. We recommend that you take a moment and read this manual as it provides information that will help you in using your unit to it's fullest potential.

The RP220 provides clear sonic quality and performance for the working musician, studio operator or anyone who needs a preamp with the warm, smooth, analog sound. Each channel uses one Bellari premium 7025 tube in a unique configuration to give smooth controllable gain with a true transformer balanced input. The unit has both XLR and 1/4" inputs and outputs with Pad switches and Phase Reverse switches to adapt to any performing or studio situation.

INSPECTON

1. Unpack and Inspect the RP220 package

Your RP220 was carefully packed at the factory in a protective carton. Nonetheless, be sure to examine the unit and the carton for any signs of damage that may have occurred during shipping. If obvious physical damage is noticed, contact the carrier immediately to make a damage claim. We suggest saving the shipping carton and packing materials for safely transporting the unit in the future.

2.Please complete the Warranty Registration Card and return it to the factory.

WHY TUBES

The primary purpose of a preamp is to provide low noise gain to micro- phones and instruments without coloring or distorting the sound in any way. But any audio electronic device seems to have a characteristic "sound," sometimes it can be pleasing, sometimes not.

Tube preamps have gained in popularity to counteract the "digital sound" of digital recording equipment. Many engineers preferred the "sound" of analog recording equipment, but like the editing and predictability of digital. Because tubes have natural compression they have a smoother sound than solid state preamps. When they do clip, they have a more

INPUT

2

GAIN

30dB PAD

PHASE

REVERSE

				Output
			OUTPUT	Buffer
			LEVEL	30dB	2
				PAD
				SWITCH
					OUTPUT
10	5	3	0
			3
20			6
		dB

even harmonic structure. Attempts to duplicate these characteristics with solid state circuits have met with limited success.

	+250	+48
	+12	Power Supply
	-12
+48 VOLT

PHANTOM POWER

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