Valves - how can you tell if they are blown? - Jemsite
Tech: Setup, Repairs and Mods Guitar workbench discussion such as setup, repairs, mods, installing new parts and more.

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 08-11-2002, 02:42 PM Thread Starter
 
Join Date: Nov 2001
Location: Birstall, United Kingdom
Posts: 295
Valves - how can you tell if they are blown?

I had a Cornford Harlequin delivered on Friday and I am not impressed with it. It doesn't have a nice "creamy-smooth" distortion and sounds quite bad. After a lot of talking with people, my Cornford *might* have a dead valve.

How can I tell if a valve is dead? I was told that I should look to see if they are glowing - mine only has a glowing tip (slightly glowing) after 5mins of it being on.
The other 2 valves I cannot see as there is a metal tube casing around them.

Anyone got any pics of them glowing so I can compare?
This amp will go back monday and will get an Ashdown Peacemaker 40 instead if it looks knackered

James

(BTW this is my first valve amp, not including my Marshall AVT20)
WildWayz is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 08-11-2002, 06:28 PM
 
Join Date: Dec 2000
Location: LR, AR
Posts: 1,982
when i was having tube/valve issues, i would gently tapp each tube with a pencil to see if they would squeal or check if they were lighting up. www.tubestore.com is an excellent site for tube info as well as good prices on tubes. www.eurotubes.com is as well. when i had retubed my 5150 i went thru the same feelings you did, but mine was a noise issue, not tone. the way i felt about it was, replace the tubes, it won't hurt it(preamp-wise).


rich
rty13ibz98 is offline  
post #3 of 4 (permalink) Old 08-11-2002, 06:37 PM
 
Join Date: Aug 2002
Location: G
Posts: 49
my tube blown

Well when my tube blown is scared the s**t out of me...
There was a great blue flash and the smell of smoke. It scared me but it was cool. Then i replaced all tubes in the classic 30 with groove tubes (I like those) and haven't had any trouble since. But then orcourse, I've been playing that amp for about 4 years or so...
When in doubt, replace (I wanted to get those cheap japanse things out anyways)
guitarpicker2006 is offline  
post #4 of 4 (permalink) Old 08-12-2002, 11:01 AM Thread Starter
 
Join Date: Nov 2001
Location: Birstall, United Kingdom
Posts: 295
The valve seemed fine... I sent the amp back and ordered a Ashdown Peavemaker 40 instead. Same speaker, same valves as the Cornford, but 40watts, 3 channels, effects loop etc
And it was only 299

James
WildWayz is offline  
Reply

Tags
groove tubes , marshall avt

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Jemsite forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address

IMPORTANT: You will be required to activate your account so please ensure that your email address is correct.

If you do not receive your activation check your spam folder before using the CONTACT US form (at the bottom right of each page).



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
which valves for a triaxis Shredragrammaton Gear and Equipment 1 10-28-2008 09:00 PM
Help replacing Valves Force Tech: Setup, Repairs and Mods 0 10-07-2007 08:19 AM
Unplugging valves NNS Gear and Equipment 9 12-30-2006 08:10 AM
Amp blown? Bzz Tech: Setup, Repairs and Mods 5 07-29-2006 03:02 PM

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome