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Post subject: Fender 68 Custom Reverb
Posted: Mon Feb 04, 2019 9:36 am
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Joined: Sun Feb 03, 2019 1:32 pm
Posts: 92
Hello from a new member!

I have a 68 Custom Deluxe that I bought new in June of 2018.
As of about 2 weeks ago...when the amp comes off standby there is "noise"...sort of like stepping gently on a bag of potato chips and you can hear the noise reverberate somewhat.
To date I have:
Checked all tubes...all test good
Cleaned all tube pins with DeOxIt
Unplugged the reverb tank cables...noise still present
Now the noise is not always present as soon as I take the amp off standby but if not, it's there after about 4-5 minutes.
Then...it goes away...then it may or may not come back after an hour or so.

Fender says the amp is still under warranty...tubes are not...but, believe it or not, it has been tough to find a good tech over the last 30 years...the best tech is about 60 miles away.

Any suggestions as to what might be going on...bad tube socket, bad cap or resistor, bad this or bad that???

Thanks in advance,

Royb3988


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Post subject: Re: Fender 68 Custom Reverb
Posted: Mon Feb 04, 2019 10:07 am
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Professional Musician
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Joined: Thu Aug 07, 2014 3:25 pm
Posts: 1023
Your description of a warm up time for the symptom to follows the 2 Minute rule.
If the symptom shows up only after a 2 minutes, its likely a tube issue.
Tubes will operate before they get up to full temperature. Once they get up to full temp will failures appear. Much like a car that overheats, it won't be a problem until it gets up to temp.
To find the tube at fault, pull one at a time, starting from the end away from the power tubes. If you have a replacement on hand, sub it in, one position at a time.


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