Tape out of passive preamp into passive preamp/remove resistors? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 24th June 2012, 11:06 PM   #1
Hikari1 is offline Hikari1  United States
diyAudio Member
 
Join Date: Jun 2012
Location: Seattle
Default Tape out of passive preamp into passive preamp/remove resistors?

Hi guys,

i am using a Carver C1 preamp as a phono pre, sending the signal out through the tape out to a passive pre then on to the power amp. Unusual setup, I know. Looking at the schematic there is nothing between the phono stage and the tape out but 2.2K resistors.

Since I am using a passive pre I need every bit of signal gain I can get. The low signal is compounded by my low output MM cartridge. The 2.2K resistors on the output of the tape out, could changing the resistors to lower value increase gain? I am not talking about resistors in the phono stage but rather right at the end of the tape out. Can I remove them? What is their function?
  Reply With Quote
Old 24th June 2012, 11:19 PM   #2
Davey is offline Davey  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Bremerton, WA.
What's the resistance value and configuration of the attenuator in your passive pre?

If the ratio between it and 2.2k is fairly large, you're not going to achieve much by lowering their value or removing the 2.2k resistors.

Series resistors on the outputs of stages are common. They serve to decouple capacitive loads and prevent short-circuiting the outputs during connecting/disconnecting of interconnect cables....which might possibly damage them.

Generally though, they're not valued quite as high as 2.2k. I believe you could reduce those by a factor of ten and be just fine.

Cheers,

Dave.
  Reply With Quote
Old 25th June 2012, 01:59 AM   #3
Hikari1 is offline Hikari1  United States
diyAudio Member
 
Join Date: Jun 2012
Location: Seattle
25K pot in the preamp. Sounds like changing those resistors won't change much. But it was a good to fnd out what they do.
  Reply With Quote
Old 25th June 2012, 10:43 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Fit a pair of B1 as your output buffers. Then the record out and the listen out will both be good.
Or fit a DCB1 and duplicate the buffer section to give 4 input channels and 4 output channels, all off the common dual rail PSU.
__________________
regards Andrew T.
  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
Passive NAB Tape Preamp? tmblack Analogue Source 11 19th June 2012 08:18 PM
Passive preamp done right jdruley Analog Line Level 0 13th August 2010 08:26 PM
passive preamp digi01 Chip Amps 4 8th February 2005 05:37 PM
My little passive preamp zygibajt Pass Labs 37 14th October 2004 07:40 PM


New To Site? Need Help?

All times are GMT. The time now is 10:19 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