Adding a pre out to amp - 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
Thread Tools Search this Thread
Old 27th December 2013, 11:24 PM   #1
monaro is offline monaro  Australia
diyAudio Member
Join Date: Dec 2013
Default Adding a pre out to amp

Hi guys,
I have a doosie of a question.
I have a kriesler 11 97 (here:
And I want to add a powered subwoofer to the preamp output (which it doesn't have!)
I was thinking of adding a connection at the volume pot but I can't get it to work when I connect it that channel stops working.
The amp does have high level input too but I find lack of bass using them - I think the tube amp filters out the low bass.
Any ideas? I'm not sure if maybe I need to add a resistor to the new rca connection so it doesn't cancel the channel although I'd have thought there would be bugger all signal drawn from the amp given its line level in?
  Reply With Quote
Old 28th December 2013, 05:57 AM   #2
diyAudio Member
Join Date: Nov 2009
Location: Los Angeles
The output of the volume control should be the place but the impedances are so high you really want to add a buffer so that the cable capacitance doesn't affect the internal or external amp response. A cathode follower would do the trick. An FET source follower or a unity gain opamp would also be good.

  Reply With Quote
Old 28th December 2013, 07:10 AM   #3
monaro is offline monaro  Australia
diyAudio Member
Join Date: Dec 2013
Oh thanks this is great advice. I understand that now - cathode following will stop the connection draining the whole signal. Question is what exactly do I buy and how do I connect it - i've never used one! Thanks!!
  Reply With Quote


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
Adding pre-out to an integrated amp schubert Solid State 31 28th August 2014 12:12 PM
adding output tubes etc to pre amp pforeman Tubes / Valves 1 2nd February 2009 06:02 PM
Adding Pass through input on my pre-amp RollE2k Parts 3 27th June 2008 03:47 PM
Adding a HP-amp to my pre-amp design rho Chip Amps 3 8th April 2004 07:17 PM

New To Site? Need Help?

All times are GMT. The time now is 12:20 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