MODEL 2150 & CLASSIC POWER A MPLIFIERS USER’S M ANUAL
PACKING INSTRUCTIONS UNPACKING Inspect your 2150/Classic amp for hidden damage that may have occurred in transit. Your amp was inspected and sound-tested before shipment from the factory. All claims for shipping damage must be made by the receiver. Save your box and packing material for evidence of damage if it has occurred. The original box and packing materials are specifically designed to protect your amp durPACKING MATERIALS ing shipment. SAVE ALL PACKING MATERIALS.
2150/CL ASSIC OWNER’S MANUAL ongratulations. You have purchased unquestionably the finest musical instrument power amplifier available. C Your new VHT power amplifier incorporates a unique combination of state-of-the-art electronics and time-honored audio design. Meticulous craftsmanship coupled with only the highest-quality components assures decades of trouble-free performance.
SPECIFICATIONS 2150 Power Output: Input Impedance: Input Sensitivity: Output Impedance: Power Requirements: Dimensions: Front-Panel Features: Rear-Panel Features: 105 watts RMS per channel 100 watts per channel, both driven simultaneously Four KT88/6550A output tubes, two per channel Two 12AT7 driver tubes, one per channel Two 12AX7 preamp tubes, one per channel 100k ohm Switchable -10dBV to 0dBV Selectable to 4, 8, and 16 ohms 117 Volts AC, 60 Hz, 6 amps max, 700 watts max Height, 7" (4 rack spaces), Wi
CONTENTS PACKING & UNPACKING INSTRUCTIONS Safety cautions and warnings Tube location charts INTRODUCTION SPECIFICATIONS FOR 2150 & CLASSIC FRONT-PANEL CONTROLS & FUNCTIONS Standby switch Volume control Presence control Depth control Fan speed switch A fuse and B fuse Mains (AC power) switch Mains (AC power) fuse Fuse replacement information Definition of damping REAR-PANEL CONTROLS & FUNCTIONS Voltage rating indicator Mains (AC power) receptacle for power cord Mode switch for pentode/triode operation Impeda
CONTROLS & FUNCTIONS FRONT PANEL 1 STANDBY: Disconnects power to individual channels when idling. 2150: I = on 0 = standby CLASSIC: I = half power 0 = standby II = full power After turning the power on, wait a few minutes before turning the standby on. In this way, you can warm up the amplifier before applying full voltage to the tubes. This helps the tubes and other components to last longer.
1 VOLUME 2 PRESENCE 3 DEPTH 4 2150 STANDBY 2 PRESENCE 3 DEPTH 4 CHANNEL A 1 VOLUME CLASSIC STANDBY CHANNEL A 5 HI 5 HI FAN B FUSE 1A FAN B FUSE 1A LO 6 6 LO 7 MAINS 7 MAINS 8 8 MAINS FUSE 10 A S.B. A FUSE 1A 9 9 MAINS FUSE 10 A S.B.
CONTROLS & FUNCTIONS REAR PANEL 1 VOLTAGE RATING: This plate indicates proper voltage rating of the unit. 2 MAINS: AC input socket. See Installation & Operation. This amplifier is equipped with a grounding-type supply cord to reduce the possibility of leakage current. Be sure to connect it to a grounded receptacle. Operation from an ungrounded (twopronged) AC receptacle requires a 3-to-2-contact grounding-type adapter. Be sure to connect the adapter’s grounding lead to a good earth ground.
SPEAKER VOICING 1 2 7 B 8 INPUT HI LO SENSITIVITY 9 A / MONO 10 VOICING 1 2 7 13 SPEAKER USE FIRST 5 OUTPUT 6 IMPEDANCE 8 4 SELECT 16 6 OUTPUT USE FIRST 5 MODE PENTODE TRIODE 3 MODEL SERIAL 11 12 8 IMPEDANCE 8 SELECT 4 4 MODE PENTODE TRIODE 3 16 2 VAC 50 / 60 Hz 700 WATTS 1 4
INSTALLATION & OPERATION BEFORE APPLYING POWER, MAKE SURE: 1. Unit is connected to the correct voltage source with a proper 3-wire grounded outlet. Use only the AC cord provided. 2. Cooling vents are free from obstruction. 3. Speakers are plugged into the correct output jacks using minimum 18-gauge speaker cable. DO NOT USE SHIELDED CABLE. 4. Impedance selector is at correct setting. See Speaker Connection. 5. Fan speed switch is set at “Hi.” 6. Standby switches are set to off (“0”) position.
MAINTENANCE & SERVICE Proper maintenance and routine servicing will assure continued top-notch performance from your VHT Amplification system. Generally, we prefer that routine service and tube replacement are performed by your VHT dealer or service outlet. WARNING: HOT TUBES! HAZARDOUS VOLTAGES! 1. Always remove the power cord before attempting tube or fuse replacement. 2.
TROUBLESHOOTING GUIDE WON’T TURN ON 1. Make sure AC cord is securely connected at both ends. 2. Verify the power source with something you know works. 3. Check the mains fuse, and replace if necessary (if it blows again, refer to qualified service personnel). NO SOUND (One or both channels): 1. Check volume controls. 2. Make sure that the input sensitivity switch is in the proper position. 3. Check the standby switch. 4. Check input cables. 5.
CONNECTING THE 2150/CLASSIC SLAVING HEADS EQUIPPED WITH LINE-LEVEL OUTPUT Speaker Output Line Output Head Speaker Output Speaker Speaker Output A/Mono Input Speaker or Dummy Load Speaker Speaker Speaker Speaker Output 2150 or Classic Power amp Line Output Speaker Head Effects switcher, Mixer, etc.
CONNECTING THE 2150/CLASSIC SLAVING HEADS NOT EQUIPPED WITH LINE-LEVEL OUTPUT Speaker Outputs Head Output Pad* Effects devices, Switcher, etc. Speaker Speaker Left output Right output 2150 or Classic Power amp B Input A Input Speaker Speaker Speaker Speaker * See Connecting To A Guitar Amplifier, page 11.
CONNECTING THE 2150/CLASSIC PREAMP CONFIGURATIONS Mono preamp connected directly to power amp Stereo preamp connected directly to power amp Preamp Preamp Preamp Output Speaker Output Preamp Outputs Speaker Output Speaker Output 2150 or Classic Power amp A/Mono Input Speaker 2150 or Classic Power amp B A Input Input Speaker Speaker Speaker Output Speaker Speaker Mono preamp’s output sent in series through effects to power amp Preamp Speaker Speaker Speaker Stereo preamp with effects in
WARRANTY Subject to the Obligations and Exclusions found below, this VHT product is warranted against manufacturing defects in materials and workmanship for the period of one (1) year from the date of purchase, with the exception of the tubes and fuses, which carry a 90-day warranty. The warranty period commences on the date of purchase by the original user.
1200 Lawrence Drive Suite 465 Newbury Park, California 91320 (805) 376-9899
