Related Manuals for Bandwidth Audio Kaskode One
Summary of Contents for Bandwidth Audio Kaskode One
- Page 1 Kaskode One – Phono Preamplifier Owner’s Manual www.bandwidthaudio.com sales@bandwidthaudio.com...
- Page 2 WARNING Configuration of the Kaskode One will require removing the cover of the unit. Before removing the cover for any reason, make sure to power off the unit and unplug from mains wall outlet. Wait a minimum of 60 seconds for all voltage to dissipate before opening the cover.
- Page 3 CONTAINS LETHAL VOLTAGES High voltage can be lethal. Do not remove cover while preamplifier is connected to the Mains power source. For service, contact Bandwidth Audio. HIGH VACUUM TUBE TEMPERATURES Vacuum tubes can get extremely hot with bulb temperatures capable of reaching 200ºC. Do not touch or attempt to remove the tubes while they are hot.
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Page 4: Table Of Contents
Moving Coil Input Connections ......................9 Balanced / Unbalanced Input ....................9 1.5.1 Moving Magnet Input Connections....................10 Kaskode One Input Wiring Diagram .................... 10 Tonearm and Turntable Wiring ....................... 11 RCA Connection ......................... 11 1.8.1 XLR Connection (MC Only) ....................12 1.8.2... - Page 5 Figure 11: Input Network for MC Input ........................19 Figure 12: Location of Step-up ratio switches ...................... 23 Figure 13: Location of Rsl selection switches S1 and S4 .................. 25 Figure 14: S1/S4 Rsl setting for 10000Ω ........................ 26 Kaskode One Rev 1.1...
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Page 6: Kaskode Connections And Setup
1.0 Kaskode Connections and Setup From the factory, the Kaskode One is configured as follows Subsonic filter is active • MC Step up module (if installed) is configured for unbalance operation • MC Step up module (if installed) ratio is set 1:10 •... -
Page 7: Mains Ac Grounding
This removes the chance of any pop and noise during power on and off. The Kaskode One can be turned on and off without any need for power sequencing with other equipment. The “Active” indicator on the front panel shows the status of the power on sequence. -
Page 8: Installing Optional (Mc) Moving Coil Module
Installing Optional (MC) Moving Coil Module The Kaskode One features optional plug in transformer modules to also support MC type cartridges. If your preamp was ordered with the MC option, these transformers have already been installed at the factory. To install the MC modules: Align the MC modules so that the white orientation markers are aligned on both the main preamp PCB and the PCB of the module. -
Page 9: Moving Coil Input Connections
When using an RCA cable for the MC input, unbalanced connection is recommended. • When using an XLR cable for the MC input, either unbalanced or balanced connection • can be used. Remember to set J3 on both MC module boards • Kaskode One Rev 1.1... -
Page 10: Moving Magnet Input Connections
MC step-up module as well as the resistive loading. Moving Magnet type cartridges will require setting the capacitive loading. Kaskode One Input Wiring Diagram Figure 2: Input Wiring Diagram Figure 2, above shows how the inputs for the MM and MC sections are wired. Notice that both the MC RCA and MC XLR inputs can be wired as unbalanced or balanced by connecting or removing jumper J3. -
Page 11: Tonearm And Turntable Wiring
1.8.1 RCA Connection When using RCA cables to connect the turntable to the Kaskode One, no part of the RCA connector on the turntable should be connected to the plinth or tonearm. The RCA connector should only connect to the cartridge. For most cartridges, a pair of RCA connectors is used for Left (L) and Right (R) stereo channels. -
Page 12: Xlr Connection (Mc Only)
Kaskode One. Note that the RCA jacks are completely isolated from each other and from the tonearm. In this case, the tone arm is connected to the Kaskode One ground connection through a separate wire. The tonearm now acts as an electric shield around the wires that connect to the cartridge. -
Page 13: Figure 5: Turntable Wiring For Xlr Option 1
Pin-1 on the turntable XLR connector is not connected. The XLR cable is still shielded through Pin-1 on the Kaskode One input XLR ground, so there is still hum rejection. However, the plinth and tonearm are floating, so a wire to connect these parts to the Kaskode One “Ground” terminal is required. -
Page 14: Subsonic Filter
Subsonic Filter The Kaskode One has a selectable subsonic filter to help remove any unwanted subsonic noise or rumble due to warped records and other low frequency mechanical noise. This is in accordance with the 1976 IEC Amendment for the RIAA equalization curve during playback. This is a 6dB slope filter placed at 7950uS or approximately 20Hz. -
Page 15: Cartridge Loading
2.1.1. MM Input Resistance Moving magnet cartridge types are typically designed to operate into a 47KΩ resistance. The MM input of the Kaskode One has been set to 47KΩ. 2.1.2. MM Input Capacitance (S2/S5) Input capacitance loading for MM cartridge types is extremely important for best performance. The user will need to set the input capacitive loading for a Moving Magnet cartridge to optimize the frequency response. -
Page 16: Figure 9: Location Of S2 And S5 Switches For Setting The Input Capacitance
Left channel) by moving the switch positions 1-4 indicated to the “ON” position. Figure 9: Location of S2 and S5 switches for setting the input capacitance Note: Orientation of S2 and S5 are rotated 180º from each other. Be sure to set both S2 and S5 identically. Kaskode One Rev 1.1... -
Page 17: Figure 10: S2/S5 Setting For 150Pf
The desired input capacitance is enabled with each switch position. Combinations of capacitance are also enabled by moving multiple switch positions to “ON”. The table below shows all 15 input capacitance combinations available on the Kaskode One to dial the best performance with any cartridge. - Page 18 The native input capacitance of the Kaskode One is an extremely low 15pF. This allows the user to better tune the capacitance for their desired cartridge. To keep tunability at a maximum, it is suggested to use very low capacitance cables between the turntable and Kaskode One and use S2/S5 switches to precisely set input capacitance.
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Page 19: Mc Cartridge Loading Options
For Moving Coil cartridges, the critical tuning parameter is the input resistance for loading the cartridge. Since the Kaskode One uses a step-up transformer for MC cartridges, the loading is dependent on the step-up ratio used. Based on the desired step-up ratio, the proper Secondary Loading Resistance (Rsl) must be selected for the desired cartridge load. - Page 20 Rsl value of 3170Ω is not recommended for 1:20 step-up ratio. Rsl value of 1000Ω is not recommended for 1:10 and 1:20 step-up ratios. These setting can be experimented with but may not achieve desirable results. Table 3: Cartridge loading based on Rsl Kaskode One Rev 1.1...
- Page 21 See section 2.2.2 for selecting the MC Step-up Ratio See section 2.2.3 for selecting the Rsl value Note: For best selection of MC cartridge loading and step-up ratio, it is suggested to use Bandwidth Audio MC cartridge calculator, available from www.bandwidthaudio.com Kaskode One Rev 1.1...
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Page 22: Selecting The Mc Step-Up Ratio
MM phono preamp input. The Kaskode One has selectable 1:5, 1:10 and 1:20 transformer step-up ratios for 60dB, 66dB or 73dB total gain respectively. The best way to select the correct step-up ratio is to calculate the approximate output voltage from the transformer. -
Page 23: Figure 12: Location Of Step-Up Ratio Switches
The MC step-up ratio is selected by setting the dip switches on the MC module board. The figure below shows the location of the switches. Figure 12: Location of Step-up ratio switches Kaskode One Rev 1.1... - Page 24 The diagrams below show the MC module switch configuration for the following step-up ratios: 1:5 Step-up Ratio 1:10 Step-up Ratio 1:20 Step-up Ratio Kaskode One Rev 1.1...
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Page 25: Selecting The Rsl Value For Cartridge Loading
S1 and S4 on the main PCB. The location of S1 and S4 is shown below. Figure 13: Location of Rsl selection switches S1 and S4 Note: Orientation of S1 and S4 are rotated 180º from each other. Be sure to set both S1 and S4 identically. Kaskode One Rev 1.1... -
Page 26: Figure 14: S1/S4 Rsl Setting For 10000Ω
If desired, capacitance can be added to soften the high frequency response. It is recommended to tune this by ear. See Section 2.1.2 for details on setting the input capacitance. Kaskode One Rev 1.1... -
Page 27: Controls And Layout
Approximately 60 seconds after power on, the LED will illuminate indicating the preamplifier is active and ready to use. 3. Mode Selects either Moving Coil or Moving Magnet inputs. LED indication shows which input is active. Kaskode One Rev 1.1... -
Page 28: Back Features
5. Ground Lift 1. Mains Input 3. MC Input 4. Ground 6. MM Input 7. Output Use only voltage indicated on 1. Mains Input Socket to connect removable wall power cord. the serial number tag below mains input. Kaskode One Rev 1.1... - Page 29 6. MM Input RCA inputs used for Moving Magnet cartridges. Connectors are duplicated for Left and Right channels. 7. Output Pair of RCA output to connected the Kaskode One to a line level preamp or power amplifier. Kaskode One Rev 1.1...
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Page 30: Typical Specifications
MM Input referred Nosie (A-weighted) 0.2uV -132dBu -88dB SNR relative to 5mV input MC Input referred Nosie - 1:10 66dB mode (A-weighted) 0.058uV -142dBu -72.5dB SNR relative to 250uV input Rated Output 15V at 0.5% THD+N Kaskode One Rev 1.1... - Page 31 Power Consumption 90 Watts Dimensions (Includes faceplate and feet) 17.5” x 14.25” x 4.5” Due to the open loop design of this preamplifier, actual performance will vary depending on vacuum tube quality. Specifications subject to change. Kaskode One Rev 1.1...
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Page 32: Notes
5.0 Notes: Date: __________________ Note: ______________________________________________________ _________________________________________________________________________________________ Date: __________________ Note: ______________________________________________________ _________________________________________________________________________________________ Date: __________________ Note: ______________________________________________________ _________________________________________________________________________________________ Date: __________________ Note: ______________________________________________________ _________________________________________________________________________________________ General Notes: __________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ Kaskode One Rev 1.1...