Upside Down Tube Amp - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th October 2011, 02:24 AM   #1
diyAudio Member
 
Join Date: Oct 2011
Default Upside Down Tube Amp

Just bought an all-tube guitar amp, and after running it for a while, the front panel was getting REALLY hot. Stop the presses, right? Anyway, there is a big opening in the back with all the electronics up at the top of the space. I decided to turn the amp upside down, and see if it stayed cooler. Mission accomplished, but after jinxing myself with that famous phrase, I started wondering if I was doing some damage. Based on my cursory inspection, the tubes are stuck into the bottom of the other electronics in the normal amp orientation. I guess this means the tube are upside down, and by turning the amp over, they are now right-side up. Based on what I've read, this seems to be the happiest way for tubes to exist, plus the other components aren't getting cooked. Have I answered my own question? Maybe, but I'd be doubly blessed if some of the tube gods would deign to offer their approval, or equally useful, point out where I've gone wrong in running my amp upside down.
  Reply With Quote
Old 7th October 2011, 02:45 AM   #2
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Blog Entries: 2
As far as I know, all tubes can be run upside down (so long as they don't fall out of their sockets !!). The issue is more that some tubes can only be operated on their sides if they are rotated to a certain orientation so that there isn't any chance of hot wires inside the tube from sagging under gravity in the wrong direction.

Seems to me you've solved your problem.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 7th October 2011, 03:21 AM   #3
cerrem is offline cerrem  United States
diyAudio Member
 
Join Date: Jun 2005
Location: San Diego, CA
Some Audiophiles might say that gravity will affect electrons in transit, depending on position of tube
  Reply With Quote
Old 7th October 2011, 03:50 AM   #4
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Get a small, cheap fan from the store. Blow it onto the amp. Problem solved!
  Reply With Quote
Old 7th October 2011, 03:59 AM   #5
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
It's a pretty common configuration for guitar amps. Aside from the practical purposes of chassis size, it also puts the tubes right next to the speaker. I suppose that tube microphonics play a part in an amp's "tone" (or whatever you call it).
  Reply With Quote
Old 7th October 2011, 07:25 AM   #6
Gilgy is offline Gilgy  United Kingdom
diyAudio Member
 
Join Date: Oct 2009
Some tube data sheets include specifications about things like correct orientation, minimum spacing and the approved rotation of tube sockets. Many (most?) guitar amp manufacturers seem to have nothing but contempt for such tedious minutiae and cobble their amps together just as they see fit, possibly viewing cooked capacitors as a rite of passage for their products.

Fender, Marshall and countless other combo amps are made with inverted tubes and they work more or less reliably. Maybe they're less reliable than the corresponding head amps which have the tubes the other way up? And maybe someone will argue that the heat cooks extra tone into the tubes and makes you play like Jimi Hebdrix.

I wouldn't worry about it. And your amp will look silly upside down.
  Reply With Quote
Old 7th October 2011, 08:27 AM   #7
diyAudio Member
 
trobbins's Avatar
 
Join Date: Feb 2009
Location: Melbourne, Oz
Send the amp to me - I'm sure it will sound better and run cooler in the southern hemisphere ;-)
  Reply With Quote
Old 7th October 2011, 10:09 AM   #8
Doz is offline Doz  United Kingdom
diyAudio Member
 
Doz's Avatar
 
Join Date: Jul 2010
Location: Sat Down
Wasn't there a Danelectro amp that had a diagonal chassis??
__________________
"To err is human.. to make a real balls-up requires a computer"
  Reply With Quote
Old 7th October 2011, 12:16 PM   #9
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
My 59 ford car radio had all the tube pointing down. Worked fine, except one time I was crossing the warning strips before a toll booth and a tube fell out. WAKY was playing "Good Vibrations" at the time, too, a real disappointment.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 7th October 2011, 01:30 PM   #10
diyAudio Member
 
digits's Avatar
 
Join Date: Apr 2011
Quote:
Originally Posted by cerrem View Post
Some Audiophiles might say that gravity will affect electrons in transit, depending on position of tube
other audiophiles will claim to be able to hear it.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Upside Down Pensil? pizzachef Full Range 6 13th September 2011 05:36 PM
mounting an EL34 upside-down jarthel Tubes / Valves 2 22nd April 2007 03:32 PM
mounting tubes upside-down Mr. Triatic Tubes / Valves 18 9th August 2004 04:44 AM
Upside down port error!!! gchrist Multi-Way 5 21st August 2003 04:08 PM
Upside down speakers ashok Multi-Way 2 8th October 2002 10:06 AM


New To Site? Need Help?

All times are GMT. The time now is 09:44 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2