FDP Home Page / FDP Forum / FAQ's

The FDP is made possible by the following companies and individual members like you.
Please use the links below to show them we value their sponsorship.

Sweetwater

Apex Tube Matching

Jensen Loudspeakers

Yellowjackets Tube Converters

WD Music

Antique Electronics Supply

Amplified Parts

MOD KITS DIY


* God bless America and our men and women in uniform *

* Illegitimi non carborundum! *

If you benefit and learn from the FDP and enjoy our site, please help support us and become a Contributing Member or make a Donation today! The FDP counts on YOU to help keep the site going with an annual contribution. It's quick and easy with PayPal. Please do it TODAY!

Chris Greene, Host & Founder

LOST YOUR PASSWORD?

......................................................................

   
FDP Jam
Calendar
Find musicians
in your area!
  Search the Forums  

FDP Forum / Fender Amps: Vintage (before 1985) / '72 Twin Reverb SF tube rattling!

rattlintubes

USA

Sep 10th, 2019 05:34 PM   Edit   Profile  

They rattle only once the tubes are fully heated, when I play certain low frequency notes at a volume higher than I’d say 4 on the master and 7 on the volume.

I know its the tubes, I can press upward with a toothpick on the tube that's rattling and it will stop. Or grab the sides of the tube with an oven mitt.

However, this is where it gets weird. It’s only ever one tube that is rattling. But it will change if I take out 2 tubes (one being a tube that rattles). So say the middle left tube is rattling, I’ll take out the middle 2 tubes, turn it back on, wait for it to heat up, and then the left most tube will rattle.

I tried taking off the metal “bear trap” things that hold the tube steady to no avail.

What could be the problem here?? The amp sounds amazing otherwise, loud and crisp. Just that awful glassy rattle.

Edit: It's the Power Tubes btw not the Preamp tubes.

(This message was last edited by rattlintubes at 07:38 PM, Sep 10th, 2019)

BbendFender
Contributing Member
**********
***

American Patriot

About as ordinary as you can get.
Sep 10th, 2019 09:14 PM   Edit   Profile  

Sounds like a tube socket issue to me. If you can "wiggle" the tube and the rattle stops, it may not be a faulty tube but the tube socket.
Do you know how to tighten up a tube socket?

Elmo66
Contributing Member
**********
**

Midwest USA

Sep 11th, 2019 02:03 PM   Edit   Profile  

Don't go sticking a small metal screwdrive in the rectifier or power tube sockets without discharging the caps. 500vDC awaits you.

rattlintubes

USA

Sep 11th, 2019 02:11 PM   Edit   Profile  

I think I may have figured out the problem. When I take a tube out, the tube socket will move very slightly if I touch it, as if it is not secured to the metal bracket holding it in.
I think I'll try using some heat resistant adhesive to hold them in place, rather than get new ones as I don't have the money to have someone replace them or the expertise to do it myself.
But if this doesn't solve it, I'll just take it into a shop.

Peegoo
Contributing Member
**********
**********
**********
****

If irritation occurs

discontinue use.
Sep 11th, 2019 03:21 PM   Edit   Profile  

Each tube socket on that amp is held in place with a pair of screws. Can you operate a screwdriver? If so:

Unplug the amp and flip it on its head on a carpeted floor. Gently remove the tubes and keep them in order so you know how they go back in.

Apply a tiny dot (less than a drop) of blue Loctite to the side of each screw head so the Loctite flows around the head of the screw. Gently loosen the screw one turn only; this allows the adhesive to flow under the head. Snug the screw down.

Gently reinstall the tubes and it's ready to go. No need to wait for the Loctite to cure.

WARNING: do not stick anything into the tube sockets except for the tubes themselves, and keep your fingers away from the metal pins as the tubes are coming out and going in. Even unplugged, an amp can deliver a lethal jolt.

FDP Forum / Fender Amps: Vintage (before 1985) / '72 Twin Reverb SF tube rattling!




Reply to this Topic
Display my email address             Lost your password?
Your Message:
Link Address (URL):
Link Title:




Moderators: Chris Greene  Iron Man  reverendrob  

FDP, LLC Privacy Policy: Your real name, username, and email
are held in confidence and not disclosed to any third parties, sold, or
used for anything other than FDP Forum registration unless you specifically authorize disclosure.

Furtkamp.com 
Internet Application Development

Copyright © 1999-2019 Fender Discussion Page, LLC   All Rights Reserved