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 ser-
vice outlet.
WARNING: HOT TUBES! HAZARDOUS VOLTAGES!
1. Always remove the power cord before attempting tube or fuse replacement.
2. Wait at least 5 minutes before attempting tube or fuse replacement, to allow time for tubes to cool and
hazardous voltages to drain off.
3. When replacing tubes, remove only the rear cover.
4. Tubes: The 2150 tube complement consists of four VHT Special Design KT88/6550As, two 12AX7s,
and two 12AT7s. The Classic tube complement consists of eight VHT Special Design 6CA7/EL34s, two
12AX7s, and two 12AT7s. VHT Special Design electronic tubes provide optimum performance in this
amplifier. For best results, only replace with VHT original equipment tubes.
CAUTION
THE FAN CORD MUST BE DISCONNECTED BEFORE THE COVER CAN BE COMPLETE-
LY REMOVED. THIS IS ACCOMPLISHED BY SIMPLY REMOVING THE FAN PLUG AT
THE TOP OF THE FAN. CARE MUST BE TAKEN TO PREVENT STRAIN ON THE FAN
CORD WHEN REPLACING THE COVER.
5. Gently rotate tubes out of their sockets so as to avoid stress on the contacts and possible tube break-
age.
6. Note tube pin orientation so as to facilitate correct replacement of the tube in its socket. NEVER
FORCE A TUBE INTO ITS SOCKET.
7. When replacing fuses, gently push the fuse post in and turn slightly to the left with the proper-size
screwdriver. Then gradually release pressure to avoid stripping or fuse holder breakage.
WARNING!
TO REDUCE RISK OF FIRE, REPLACE ONLY WITH THE SAME TYPE OF FUSE.
IMPORTANT: REFER ALL OTHER SERVICE AND MAINTENANCE OPERATIONS TO QUALIFIED
SERVICE PERSONNEL. THERE ARE NO USER-SERVICEABLE PARTS INSIDE. TO AVOID RISK OF
SHOCK, DO NOT REMOVE THE BOTTOM OR TOP COVERS.
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