Add a low/half power mode to the power stage - 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 09-29-2006, 04:57 AM Thread Starter
 
Join Date: Jul 2006
Location: Belgium
Posts: 676
Reviews: 2
Add a low/half power mode to the power stage

Hi,

I'm looking for a new amp, but I'm frustrated about the fact that a lot off good sounding higher pricerange amps lack a switch to put the power amp in a lower power output mode. (I have my eye on a Hughes & Kettner Switchblade 100watt top/combo or JSX. the jsx combo has a half power switch, the top doesn't :/).

So I was wondering if it's possible to add this kind of feature to an amp ? A guy on HC told in his review of a Peavey classic stereo 19" poweramp he just removed some of the EL84 (4 per channel) to use it at low power. (Is that a good idea anyway ?).

Thx
Silverburst is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 10-03-2006, 09:58 AM
 
Join Date: Sep 2005
Posts: 84
Re: Add a low/half power mode to the power stage

It is possible for you to do it yourself, if you are somewhat knowledgeable on electronics and have point to point wired amp, it would be quite easy to put pentode-triode switch. But if you are not, it is possible to halve the output by taking simply half of the tubes out. Be sure to take them off in pairs, ie. outer pair or inner pair.

Hope this helps
morgtahna is offline  
post #3 of 4 (permalink) Old 10-03-2006, 07:50 PM Thread Starter
 
Join Date: Jul 2006
Location: Belgium
Posts: 676
Reviews: 2
Re: Add a low/half power mode to the power stage

thx for the reply. ah okay... I wasn't sure just removing tubes was possible, since tube amps can be pretty sensitive to load attached etc, I was guessing it could not be just as simple as removing a pair.

I hope to learn more about amp electronics, but atm, I'm far too rookie to start fiddling around with a high end amp without guidance hehe.
Silverburst is offline  
post #4 of 4 (permalink) Old 10-03-2006, 08:51 PM
 
Join Date: Sep 2005
Location: Sydney Australia
Posts: 2,049
Re: Add a low/half power mode to the power stage

Quote:
Originally Posted by morgtahna View Post
It is possible for you to do it yourself, if you are somewhat knowledgeable on electronics and have point to point wired amp, it would be quite easy to put pentode-triode switch. But if you are not, it is possible to halve the output by taking simply half of the tubes out. Be sure to take them off in pairs, ie. outer pair or inner pair.

Hope this helps

Possibly worth emailing the service department of the company who made your power amp and confirming that removong two tubes is okay - they'll probably advise you of which tthe best two to remove are anyway.

Cheers

David
David McCarroll is offline  
Reply

Tags
jsx combo , kettner switchblade , peavey classic , power amp , tube amp , tube amps

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











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
Phantom Power Ant1981 Gear, Equipment, Recording & Off Topic 13 03-15-2006 01:22 PM
vht pitbull 100cl vs the UL and clx texshred777 Gear, Equipment, Recording & Off Topic 25 01-30-2003 02:08 AM
Preamps Vaiworship Gear, Equipment, Recording & Off Topic 5 11-01-2001 08:49 AM
AMP POWER - significance of watts mmr7 Tech: Setup, Repairs and Mods 15 08-25-2001 08:49 AM

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