Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

No bass / No Treble But Bass And treble Help!
No bass / No Treble But Bass And treble Help!
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 28th October 2005, 10:03 PM   #11
jleaman is offline jleaman  Belgium
Join Date: Apr 2002
Send a message via AIM to jleaman
Originally posted by Nelson Pass
I suspect the pot.

Uh huh me too..

BUt i have tired a 50 k pot a 100k pot.. What could i do to change this . Fix it.. its werd..
  Reply With Quote
Old 29th October 2005, 07:45 AM   #12
Raj1 is offline Raj1  United Kingdom
diyAudio Member
Join Date: Jan 2003
Location: UK

Bottom line is this, there is no quick fix to your problem, you need another gain stage period.

Using a 50k pot requires a lower output impedence and more gain than the tube stage you have can provide.

Here are your options,

1) a solid state buffer after the tube stage. Though this obviously negates the sonic benefits of that simple tube stage

2) To somehow transformer couple the output of the tube buffer so that it can drive into low impedence loads. You could probably get away with a 10k passive pot after it then.

3) to use a tvc, so that the roll-off is not so extreme. This is my own prefered option, it is not cheap, and does not technically impress the more scientific amongst us, in terms of measurments and theories. Ping Kuei Yang Wang, he uses a system similar to your dac with a TVC, and can easily tell you what the shortcomings of your present setup are. He is busy though so getting a response is not always easy.

4) to use another tube gain stage.

Nelson has said it, it's the pot, it will work fine with most SS buffers before it, but with cap coupled tube stages like these you need an active gain stage or another of the options above...........

once you have decided on what you want to do, ask on the tubes or solid state forum about how best to achieve it. I am no expert, but have a little experience with various passive/active setups I have used.

  Reply With Quote


No bass / No Treble But Bass And treble Help!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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
replacing treble/bass cut pot rostmann Parts 1 10th August 2008 09:58 AM
Bass and treble control...how? Denis.BR Chip Amps 21 30th November 2007 04:32 AM
nominal bass and treble peace brainerd Solid State 5 21st November 2005 01:41 AM
GC optimized for Bass, mid, or treble akunec Chip Amps 4 15th November 2004 10:01 PM

New To Site? Need Help?

All times are GMT. The time now is 02:52 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio