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Model 7PX3.5 RIAA Phono Preamplifier.................................................
Model 7PX3.5/B RIAA Phono Preamplifier............................................
Applying AC Power ................................................................................. 2
About the DC Servos ................................................................................ 3
Input/Output Connections ...................................................................... 3
Setting Gain ................................................................................................ 4
Input Impedance and High Frequency Contour ................................. 5
Setting Input Impedance ..........................................................................8
Setting High Frequency Contour ............................................................7
Recommended Loadings for Various MC Cartridges ......................... 9
Warranty Service and Repair .................................................................. 10
*NOTE: VERSION 3.5 IS IDENTICAL TO VERSION 3.0 IN OPERATION AND FEATURES .
(PREAMPLIFIER VERSIONS 3.0 AND HIGHER REQUIRE POWER SUPPLY MODEL XPS7B WHICH HAS A
HIGHER OUTPUT VOLTAGE THAN MODEL XPS7A. DO NOT USE THE MODEL XPS7B POWER SUPPLY
ON PREAMPLIFIER VERSIONS EARLIER THAN 3.0 AS THE HIGHER VOLTAGE MAY CAUSE THE
INPUT FUSES IN THE POWER SUPPLY TO BLOW.)
*Preamp Version: ________
Preamp Serial No. ____________________
CONTENTS
Model 7PX
& 7PX
3.5
RIAA Phono Preamplifier
Operating Manual
Power Supply Model: _____________
Power Supply S/N.__________________
/B
3.5
1
1
Rev. 1 January, 1999
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Table of Contents
Summary of Contents for Klyne 7PX3.5
- Page 1 CONTENTS Model 7PX3.5 RIAA Phono Preamplifier..........Model 7PX3.5/B RIAA Phono Preamplifier..........Applying AC Power ................. 2 About the DC Servos ................3 Input/Output Connections ..............3 Setting Gain ....................4 Input Impedance and High Frequency Contour ......... 5 Effect of High Frequency Contour on MC Cartridge Response..6 Setting Input Impedance ................8...
- Page 2 RIAA Phono Preamplifier Operating Manual After Unpacking · Remove the Model 7PX3.5 from the protective plastic bag and check for any signs of shipping damage. Although the heavy construction and modern packaging of the 7PX3.5 make shipping damage highly unlikely, any claim must be reported immediately to your dealer or carrier.
- Page 3 Thus, a brief power interruption such as those caused by power substation switching will mute the 7PX3.5 only if it is of sufficient duration to deplete the primary DC storage capacitors. However, if AC line voltage is too low to maintain proper DC regulation, the mute...
- Page 4 7PX3.5/B) are non-inverting. Thus all signals processed will retain their correct polarity. XLR connectors used on the 7PX3.5/B are wired as follows: pin 1 - circuit ground (neutral), pin 2 - positive polarity and pin 3 - negative polarity. (The XLR connector body is mechanically and...
- Page 5 ABSOLUTELY CERTAIN THAT EACH SWITCH IS PUSHED FIRMLY A GAINST THE STOP AT THE END OF ITS TRAVEL. NOTE: Always remember to replace either the metal top or the acrylic top panel on the 7PX3.5 after setting the switches or changing resistors. The top serves two important purposes: shielding from EMI, and preventing dust and debris from collecting inside which could adversely effect the performance.
- Page 6 With the High Frequency Contour capabilities of the Model 7PX3.5 Phono Preamplifier the user can choose a quick, lucid sounding cartridge having low mechanical damping and compensate electronically for any high frequency rise which might be present.
- Page 7 Effect of High Frequency Contour on MC Cartridge Response Figure 1. Reference square wave response from a function generator in the L and R channels. The 45 degree line at the lower center portion of the display is an X-Y plot of the L Channel (vertical axis) vs.
- Page 8 Because the cartridge source impedance (DC coil resistance) is part of the RC network which sets the High Frequency Contour turnover frequency in the 7PX3.5 , you must know both the recommended HFC frequency (from the table on page 9) and the cartridge generator impedance as supplied by the cartridge manufacturer.
- Page 9 MC cartridge manufacturers is provided for by the High Frequency Contour RC network of the 7PX3.5 as described above. Thus, to preserve midrange and low frequency dynamics and accuracy, we recommend that most low output MC cartridges be loaded with as high a load as is practical.
- Page 10 RECOMMENDED LOADINGS FOR VARIOUS LOW-OUTPUT MOVING COIL CARTRIDGES Cartridge Minimum Input High Frequency Impedance (Ohms) Contour (KHz.) Alpha 1 Alpha 2 Alpha Genesis 1000 Benz Micro MC-1 Benz Micro MC-3 Benz MC Ruby Carnegie I/II ClearAudio Accurate ClearAudio Veritas Dynavector Diamond 17D2MR Dynavector Ruby 23SMR Kiseki Purple Heart Sapphire Koetsu Black...
- Page 11 In the event that you believe that your 7PX3.5 requires service or inspection, it is best to consult with the factory prior to shipment. Pack the unit in its original shipping container and packing materials, and insure it for its full value.