Impedance matching in hybrid amp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 May 2013, 03:24 PM   #1
diyAudio Member
 
Join Date: Mar 2012
Location: Krasnoyarsk, Russia
Default Impedance matching in hybrid amp

Hello, everyone
I'm trying to design a hybrid amplifier with 6N2P (12AX7) input stage and emitter follower output stage (see schematic, please - maybe I explained it improperly).
So question is - how to match the impedances of these stages? Do I need some matching stages, for instance, cathode follower? (I've seen something like this)

I took this output stage design from audio amplifier circuit, designed by Russian engineer A.Ageev in 1982 - it is very simple and unusual design - its thermostability is achieved by installing all the transistors close to each other, on same heatsink.
And, as I read on audio forums, this amplifier sounds really good.
So, input stage is "classical" common-cathode amplifier with automatic bias.
Also I plan not to place a negative feedback around the amplifier.
I haven't calculated the values of passive components yet, because I'm not sure that this design will work.

I attached the circuit of Ageev's amp and my draft.
Thanks in advance! Michael.
Attached Images
File Type: png amplifier.png (92.1 KB, 68 views)
File Type: jpg ageev.jpg (53.7 KB, 63 views)
  Reply With Quote
Old 7th May 2013, 04:40 PM   #2
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
You have not copied the schematic of the output stage correctly (exchanged emitter, collector)
  Reply With Quote
Old 8th May 2013, 03:53 PM   #3
diyAudio Member
 
Join Date: Mar 2012
Location: Krasnoyarsk, Russia
I'm sorry!!!
Here is correct variant.
Attached Images
File Type: png amplifier.png (90.8 KB, 41 views)
  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
Tube amp OPT for Headphone Amp? (impedance matching question) rongon Tubes / Valves 21 3rd January 2012 04:20 AM
Speaker impedance and amp matching? Skorpio Tubes / Valves 2 10th September 2011 06:22 AM
Help with matching speaker impedance to old tube amp idebb Tubes / Valves 8 11th April 2010 04:18 AM
impedance matching to a pro amp... MyNameIsJake Solid State 2 4th June 2006 05:32 PM
Impedance Matching & Crossover network query Redhatter Multi-Way 0 6th January 2004 07:59 AM


New To Site? Need Help?

All times are GMT. The time now is 11:01 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