Home Theater sales, calibration, service, and discussion forum. Hundreds of free manuals & setup tips.

Sign up and receive the latest newsletters by email!     Join the Forum discussions!    
    Site Map  
Home Products
For Sale
Links Contact
CRT Primer
Troubleshooting Tips
Mounting Methods
Definitive CRT
Projector Setup Guide
Tube/Raster Setup
Tube Condition (Wear)
Projector Rankings
Video Processors
Ampro 1500/2000
Ampro 2300/2600
Ampro 3600/4600
Barco (Older Analog)
Barco 70x/Cine7  
Barco 500/800/801
Barco 808/Cine8
Barco 120x/Cine9
Dwin 500/700
Electrohome ECP 
Electrohome Marquee 
Panasonic 108x
Sony 10xx
Sony 125x/127x
Sony 1292
Sony D50
Sony G70
Sony G90
Zenith 841/851
Zenith 895/900
Zenith 1200

High Voltage (HV) Lead Removal/Reinstallation


Back to Advanced Procedures Index



Some of the pictures and instructions provided in this procedure have been provided by forum member Don Kellogg.  Thanks Don!

Normally when you buy rebuilt or new tubes the high voltage (HV) leads come with the tube. There may come a time however when you want to transplant a tube from one type of projector to another, and the HV lead is different.  The procedure below describes how to remove and reinstall the HV lead from a tube.  (In case you're curious, the tube in the pictures for lead removal is from a Sony G90).

This is not a difficult procedure. We're posting it as most people have no idea what's actually underneath the boot and don't want to risk breaking a tube by removing the lead incorrectly.

Removing the boot:

1) Take a razor blade and hold it tight against the tubes bell housing.

2) Cut around the boot removing the silicon, being carefully not to cut the boot itself.

3) Once you have cut around the boot lift it up.

4) Find the clip and squeeze it together with a pair of needle nose pliers to remove it from the tube.

5) Remove any excess silicon from the tube bell if you intend to use the tube again.

Reinstalling the boot:

1) Test fit the HV lead with out silicon. Once you have a test fit remove the boot.

2) Place silicon on the bell around the area where the lead will go. The correct stuff to use is DOW 3145 RTV. Another option is high temperature silicon as found at automotive shops (shown in the picture below). Be sure not to get silicon too close to the HV lead hole.

3) Hold back the rubber cap of the HV lead and (in one move) insert the metal connector straight into the tube anode connector. Orient the red wire in the direction the original lead was placed.


4) Push down the rubber cap so that the silicone beads out around the rubber cap. Let the silicone dry for at least 4 hours before powering the set up (or however long the instructions on the silicone say that it takes to dry).


Did you find this information useful? Please consider making a donation to help defray the cost of managing and hosting future articles, tips, and documents.     

Or purchase from and a small percentage automatically goes to support this site at no extra cost to you! Visit their Blu-ray and DVD stores for sales. Want to show off your home theater? See our Blu-ray Release List & Must-Have Titles. Shop at and support our site!


Copyright All Rights Reserved.