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axis response is much smoother as well. Finally distortion mechanisms inherent 
in gradient condenser microphones are absent.  
 
For these reasons ribbon mics tend to take EQ better when it’s desired for effect. 
 

Microphone care 

 

Ribbon microphones are sensitive instruments and must be treated with care: 

1)  Never blow into the microphone 
2)  Do not use in very high wind conditions 
3)  Do not use in high velocity fields such as kick drum ports  or speaker 

reflex ports 

 
It is permissible to use the microphone in very high sound pressure fields like 
drums, electric guitar cabinets, and the like. 
 
A word about phantom power: 
Properly configured and connected phantom power will not harm the 
microphone. However a miswired or shorted cable can put phantom current 
through the transformer and can damage the ribbon. It is suggested to turn 
phantom off when using the unit as a safeguard. 

 
SCHEMATIC AND PARTS LIST 

 

RIB1   Ribbon  carrier 
T1   

Watts technology RT1 ribbon transformer 

S1  

3PDT rotary pattern switch with knob Kprp 

S2  

4PST rotary bass cut switch with knob Kprbc 

L1 

LPR tapped pot core inductor, 0.26H and 0.5H 

R1 

400 ohm 0.1W metal film resistor 

C1 

0.1 uF 50V film capacitor 

J1 

Neutrik XXXXXX male XLR connector 

Summary of Contents for Polyribbon

Page 1: ...is 150 ohms Connection is by standard XLR male connector OPERATION Preamp connection A standard balanced XLR can be used for preamp connection The preamp should be a high quality low noise design with 2000 ohms differential input impedance or higher and be capable of up to 60 dB gain Phantom power is not required Figure 8 setting Most ribbon microphones exhibit a figure eight polar pattern The fro...

Page 2: ...sure pressure gradient microphone Hyper cardioid exhibits a moderate proximity effect not as much as figure eight This occurs only from sources close and in front The middle setting of the bass cut is calibrated for flat response at 300 mm source distance Maximum clockwise setting can be used for additional bass cut if desired Omnidirectional setting As the name implies this setting gives the broa...

Page 3: ...in very high sound pressure fields like drums electric guitar cabinets and the like A word about phantom power Properly configured and connected phantom power will not harm the microphone However a miswired or shorted cable can put phantom current through the transformer and can damage the ribbon It is suggested to turn phantom off when using the unit as a safeguard SCHEMATIC AND PARTS LIST RIB1 R...

Page 4: ...s nickel plated Maximum sound pressure 145 dBA 1kHz Self noise 15 dBA 1kHz Output level 3mV Pascal figure 8 2mV Pascal hypercardioid 1 5 mV Pascal omni directional Frequency response 20Hz 20KHz individual response plot supplied with each microphone Output impedance 150 ohms balanced Weight 0 8 kg Dimensions 22 6 cm H x 8 8 cm W x 4 7 cm D with stand adapter L M Watts Technology 101 Watts Street Ti...

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