RCA preamp modification - 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 23rd March 2009, 04:32 PM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: Cleveland, OH
Default RCA preamp modification

Hi,
I want to modify the attached schematic that is posted in the RCA tube manual. I would like to use the preamp without any bass or treble controls. What do I need to remove in order to use this as a straight preamp?


scheamtic
  Reply With Quote
Old 23rd March 2009, 05:51 PM   #2
diyAudio Member
 
azazello's Avatar
 
Join Date: Aug 2008
Location: Bulgaria
Hi!
You can connect cap 0.1 uf from cathode 1-st triod to 1-st grid /pin 8/.
From pin 8 to ground - resistor 1 mom. All elements around "bass"
and "treble" You must disconnect /0.1mom, 1 mom, 10000, 0.0022,
0,022, 0.1 mom, 220, 1 mom, 0,022/.
__________________
Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
  Reply With Quote
Old 23rd March 2009, 05:58 PM   #3
diyAudio Member
 
Join Date: Jan 2006
Location: Cleveland, OH
Excellent!

I will try that out..

Thanks.
  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
Modification..... Actuary Tubes / Valves 3 26th February 2008 01:34 AM
Amp Modification shajan Solid State 3 5th January 2004 06:21 PM
Zen modification tschrama Pass Labs 8 29th December 2002 05:59 PM
Modification of an headphone amp to real preamp FrankDIY Headphone Systems 6 4th December 2002 11:55 AM


New To Site? Need Help?

All times are GMT. The time now is 05:06 PM.


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