|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
|
|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
In Reply to: Re: 5AR4 tube does not light up posted by Jeffrey Wee on February 27, 2007 at 10:56:22:
Yes.With the amp turned off and unplugged from the wall , take a 10watt 1K ohm resistor and a clip lead, connect one end of the clip lead to a ground point on the amplifier chassis and connect the other end of the clip lead to one end of the resistor. With one hand in your pocket, use the the other end of the 1K resistor to "short out" the caps in the amplifier to ground. Touch each cap connection to discharge them. Holding the resistor lead to each connection for 30 seconds. The resistor might get hot. Be careful.
Now that the amp is safe you need to look very close at the solder connections to pin 2 and 8 on the 5ar4 tube socket. If those solder connections look good then you had two bad tubes. Get a new 5ar4.
You should check your old tubes. Put your ohm meter between pin 2 and 8 on the tube itself. For a tube that has good filaments you should get a very low reading. Less than one ohm. If your tubes have bad filaments the reading will be very high. An open circuit.
If your old tubes filaments check OK and the solder connections on the tube sockets look good you might have to tighten the tube socket connectors. This is easy. Take a close look at the connectors down inside the tube socket's holes where the tube pins go. Use a small tool to carefully bend them closer together.
Good luck.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: 5AR4 tube does not light up - Tre' 11:59:18 02/27/07 (2)
- Re: 5AR4 tube does not light up - Jeffrey Wee 17:13:54 02/27/07 (1)
- Re: 5AR4 tube does not light up - Tre' 19:16:14 02/27/07 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
