Fender 5F1 Champ clone with triode mode - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 1st April 2011, 06:01 PM   #11
diyAudio Member
 
Join Date: Nov 2003
Location: NY
Quote:
Originally Posted by scitizen17 View Post
There is no "sag" in a class A amp like the 5F1, so I don't see that choke, or no choke, makes any difference whatsoever except to provide better filtering and therefore better noise reduction. Switches fail over time when not used properly, so I don't see that as a factor.
The current of a class A amp is mostly constant as long as you are well away from maximum output. In a champ things getting crazy as you play and overload the amp on peaks; class A goes out the window. There will be huge amount of sag on the psu and any increase in DCR will magnify it. BTW, make sure you have a decently sized (value and rating) screen stopper resisitor on the 6V6. I have watched the screens light-up with heat up as the ouput stage starts overloading.
  Reply With Quote
Old 1st April 2011, 08:33 PM   #12
diyAudio Member
 
scott17's Avatar
 
Join Date: Aug 2009
Location: JFK
Quote:
Originally Posted by zarniwoop View Post
The current of a class A amp is mostly constant as long as you are well away from maximum output. In a champ things getting crazy as you play and overload the amp on peaks; class A goes out the window. There will be huge amount of sag on the psu and any increase in DCR will magnify it. BTW, make sure you have a decently sized (value and rating) screen stopper resisitor on the 6V6. I have watched the screens light-up with heat up as the ouput stage starts overloading.
Right now I have a 100 ohm, 3 Watt on the screen. The choke in the PS is 411 ohms. I'd like to put a scope on the amp and see just what happens during overload. I'm playing a 1998 G&L Legacy, but I haven't been able to play the amp much, hopefully this weekend. I built a Gilmore Jr., actually 2 Gilmore Jrs. in the same chassis, about 3 years ago. Based on my initial impressions of the Champ clone, I'm really liking it.

Last edited by scott17; 1st April 2011 at 08:36 PM.
  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
Fender champ circuit low output. Jayoldstuff Tubes / Valves 6 27th March 2011 07:58 PM
Fender Champ 5C1 help needed! Spasticteapot Instruments and Amps 12 27th July 2010 11:45 PM
Fender Footswitch (Champ 25 se) R_Atkinson Vendor's Bazaar 0 9th May 2007 10:04 PM
Fender princeton/champ clone layt Tubes / Valves 6 24th April 2005 06:47 AM
Fender Champ: What Transformers? edsmith Tubes / Valves 2 6th August 2004 12:14 PM


New To Site? Need Help?

All times are GMT. The time now is 08:33 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