trinityamps.com

Trinity Amps Guitar Amp Forum
It is currently Thu Oct 01, 2020 6:14 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Wed Mar 18, 2020 10:58 pm 
Offline
Friend
Friend

Joined: Tue Mar 10, 2020 2:55 am
Posts: 15
I was thinking about adding a "power amp in" jack to bypass the preamp for the option to run other preamps directly into the power section. Has anyone done this yet? I haven't found any good guides online. Would it be as simple as running the Master Volume lead to a cliff jack before heading to the power tube, so that inserting a jack breaks the preamp circuit? Should the preamp go to ground or can it just remain open? OR does interrupting the preamp not matter as long as i have the gain and master volume controls turned all the way down when using the "power amp in"?

Thanks in advance


Top
 Profile  
 
PostPosted: Mon Mar 23, 2020 12:02 am 
Offline
Expert
Expert

Joined: Sat Dec 04, 2010 3:42 pm
Posts: 510
Location: Qualicum Beach, BC
That should work. You could also install the jack before the power amp's volume control. The preamp output is OK to float. If you put the jack after the volume control, the volume control will provide a load for the preamp. If it's before, the tone stack will.

You might need a resistor to ground on the power amp input for a grid leak, depending on what the external preamp has on its output. Something around 1 meg should work.

It's similar to installing jacks for an effects loop. You could look for information about that.


Top
 Profile  
 
PostPosted: Tue Mar 24, 2020 10:28 pm 
Offline
Friend
Friend

Joined: Tue Mar 10, 2020 2:55 am
Posts: 15
Thanks for the info! I decided to hold off on this and just get the amp done. I can always go back and change this section easily enough.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group