• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Loose pin on a JJ 300B

Hi,

On one of my JJ 300B's there is a loose pin. (see pics)
Any idea how to fix this?

Thanks,
Jim
 

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Don't listen to the above posts.

First you must remove the base of the tube. Using a pair of pliers to grip the base, hold the tube tightly and rotate the base until it comes off. This may require some amount of force but don't be concerned.

Once the tube shatters into a million pieces from the unsuccessful attempt to remove the base order a new tube. :D
 

kevinkr

Administrator
Paid Member
Don't listen to the above posts.

First you must remove the base of the tube. Using a pair of pliers to grip the base, hold the tube tightly and rotate the base until it comes off. This may require some amount of force but don't be concerned.

Once the tube shatters into a million pieces from the unsuccessful attempt to remove the base order a new tube. :D

:eek: ;)