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.

Germanium transistors for a preamplifier
Germanium transistors for a preamplifier
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 7th January 2011, 11:38 AM   #11
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
I very much doubt that electron mobility is a significant factor at low frequencies (audio) and low power (headphones). This sounds like just another attempt to start a fashion for mild effects boxes masquerading as preamps. If you put "digital sound" in and get "analogue sound" out then it has fiddled with the signal and is therefore an effects box. Will "germanium sound" now replace "tube sound" ?
  Reply With Quote
Old 4th June 2015, 06:18 PM   #12
djonins is offline djonins
diyAudio Member
 
Join Date: Feb 2010
Default Germanium Transistors

There is an audible sound difference between germanium and silicone transistors (it appears that all together germanium devices have lower intermodulation distortion and this is giving "clean" sound similar to tube pre-amps). The best possible transistors for that purpose were AC151r and they were used in professional equipment (for example "Uher 4400 Report Stereo" tape recorder, non-IC version). They were also used in mixing consoles/phono pre-amps from late sixties/early seventies (by "Grundig","Telefunken" etc.). They have been replaced by silicone BC549c NPN/BC559c PNP. For example, AKG is using these silicone transistors in their built-in mike-preamps for the model 1000S. The orientation in this design is about 50uA (micro-amps) collector current and 10:1 max. ratio between collector and emitter resistor with no shunting capacitor (feedback) for the lowest noise levels.
  Reply With Quote
Old 6th June 2015, 10:15 AM   #13
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
There is a very good reason why early solid-state equipment used germanium transistors. There is an equally good reason why later equipment used silicon (not "silicone" - that is floor polish or car wax!). In each case they were using the best devices currently available.

Almost all SS equipment is designed with lots of negative feedback so the end result does not depend on the characteristics of the devices - which on their own are very nonlinear. About the only exception is where signals are so small that BJT exponential distortion is small enough to be ignored.
  Reply With Quote

Reply


Germanium transistors for a preamplifierHide 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
Transformers for Germanium transistors moonbird Solid State 30 24th July 2012 11:43 AM
Source for Germanium transistors Hyounce Power Supplies 26 8th January 2011 11:49 PM
Leakage in germanium transistors... space-cake Parts 0 17th October 2009 07:09 PM
Wanted: Germanium transistors mark.carline Vendor's Bazaar 0 12th September 2008 03:07 PM
What to do with my germanium transistors keantoken Parts 7 6th April 2008 06:05 AM


New To Site? Need Help?

All times are GMT. The time now is 06:33 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki