• Supporting Membership Changes

    The Supporting Memberships are currently being updated moving forward.

    In order to coordinate giveaway drawings to the Supporting Members there will be a new alignment in the naming of the tiers. (Note: Non-Supporting (Basic) and Monthly Supporting Members can get into the drawings by mailing a postcard. Details on that will follow with a giveaway starting soon).

    The pricing for each Supporting Membership level remains the same though the naming of them will change. The privileges remain the same as current but with the new name. If you are a current Supporting Member, you will be upgraded automatically for the existing term of your Supporting Membership. We are introducing a new tier with new perks.

    Table here

    Supporting Membership Guide

    • Monthly Supporting Members will remain Supporting Members
    • Current annual Supporting Members will now be Silver Supporting Members. Perks and permissions remain the same
    • Current Silver Supporting Members will now be Gold Supporting Members
    • Current Gold Supporting Members will now be Platinum Supporting Members
    • A new level will be created - Double Platinum Supporting Members

    All memberships will now have the option to remain as non-recurring memberships or choose reccuring memberships moving forward. *Note: current memberships will NOT be changed to recurring memberships.


John Phillips-JCM 800?

IIIBOOMERIII

Supporting Member
Messages
1,518
I have an 83 or 84 JCM800 2203. When I turn this amp on, it
will buzz for about 2-4 minutes and then the buzz goes away.
With the exception of the buzz when the amp is first turned on,
it is a very quiet amp, even in melt your eye balls typical
Marshall mode.

This never really bothered me and it has gone on for a few years
now. But, now that I am a little more hands on with my amps, I
would like to track the problem down. Any suggestions as to how
to start the trouble shooting? I am guessing that because of the
age of the amp it could be a filter cap problem, as I have never
had to have the amp serviced. The only thing I have had to do
to this amp is changed tubes.

Now I have changed 2 or 3 resistor values in the pre-amp
section to get a tad bit more distortion. However, I had this
problem with the amp before I did this mod.

Thank you in advance John and anyone else who wishes to chime
in.

Eddie
 

John Phillips

Member
Messages
13,040
I don't really have a good idea, except that it probably isn't the filter caps. It's more likely to be something like a resistor or joint with a crack in it that warms up and makes contact... or a ground screw connection.
 

donnyjaguar

Member
Messages
4,201
This is where cool-it spray comes in handy. You spray components with the cool mist until the fault returns and there's your culprit. This is shoddy troubleshooting in my opinion, but its what the old TV repairman used.
 




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