VTL IT-85, Owner'S Manual

IT-85 Integrated amplifier  
Owner’s Manual 
VTL 

26

1.  Plugging in a new tube:

 Hold onto the upper portion of the tube 

towards its tip. Lower the 
tube onto the socket, 
making sure that the pins 
from the tube match the 
holes in the socket. There 
are either two pins on the 
tube which are spaced at a 
wider distance from each 
other than the rest of the 
pins (9 pin miniature tubes), 
or there is a locating pin in 
the middle of the tube (8 
pin octal tubes).  Make sure 
that these locators go into 
the side of the socket that 
matches. Press the tube 

firmly into its socket, using a gentle force and a slight “rocking” motion.  
When the tube is properly and completely inserted into the socket it 
should be firmly seated and does not give in to any movement at all when 
you try to rock it gently. If the socket appears loose and not making 
contact with any or all of the tube pins, the socket should be re-tensioned. 

2.  Replacing the protective cage:

 Lower

 the IT-85’s cover chassis 

slowly back onto the opened IT-85 box, making sure that the cover is put 
on in the correct front and back position.  Locate the screws that were 
removed from the cover and put them back in the correct holes.  Tighten 
all screws to make sure that the cover is securely fastened to the unit.   

Changing the Main and B+ Fuses 

The B+ fuse for your IT-85 is rated at 1A ceramic Fast Acting.  There is also one 
primary mains fuse rated at 6A Slo Blo (100/120Volt AC) or 3A Slo Blo (220/240 
Volt AC) ceramic.  The B+ fuse is housed in a fuse holder located on the back panel 
of the IT-85, and the mains fuse is housed in a separate holder also located on the back 
panel of the unit. To change either fuse make sure the unit is powered off, and 
disconnect the AC power cord from the unit. Move the IT-85 so that you can work 
with the panel in the back. The type of fitting used for the fuses is called a bayonet fit, 
which describes the action needed to remove the fuse cap. Locate the Main fuse 
holder, to loosen it by inserting a flat head screwdriver into the slot and turning the 
screw head approximately one quarter of a turn in a counter-clockwise direction while 
pressing inwards. The fuse cap should spring out from its housing with the fuse held 
inside the cap. Take the fuse out and replace it with a new one, and insert the fuse cap 
back into the holder, pushing it downward while turning it in the clockwise direction to 
lock it in place. Use the same procedure to replace the B+ fuse.