One tube radio - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 5th October 2012, 11:54 PM   #1
diyAudio Member
Join Date: Mar 2012
Default One tube radio

I was just reading a russian forum and I found this project. Its a radio receptor, with the tube 6ba6, I supose that its for AM or SW bands. I have some 6ba6 laying around here, so I decided to give a try to this radio. Anyone can explain to me how this works?

Note: I dont know how this coil have to be.. A conventional ferrite coil from a AM radio may work? And any chance to try a FM coil (if i change the variable to 5~60pf) ?
Attached Images
File Type: gif 6BA6regen.gif (18.5 KB, 172 views)
  Reply With Quote
Old 6th October 2012, 12:51 AM   #2
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
Yes, that's an AM broadcast band setup. Change the tuning "tank" and it will work on the longer SW bands. The circuit is a grid leak detector, with regenerative (positive) feedback. The feedback control is adjusted to bring things just shy of oscillating. You will hear a "plop", when oscillation starts. Should that occur, you have to back all the way off and start over.

For a 1 tube FM setup, a super regenerative detector is in order. Look here.
Eli D.
  Reply With Quote
Old 6th October 2012, 01:03 AM   #3
kevinkr is offline kevinkr  United States
diyAudio Moderator
kevinkr's Avatar
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Regenerative radio receivers can be a lot of fun, one thing to bear in mind is that they can (and often do) radiate RF on the antenna if allowed to actually oscillate which can be a problem when used for CW or SSB reception (badly in this case), since SW and BC bands generally use AM this should not be a problem.
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  Reply With Quote
Old 6th October 2012, 09:29 PM   #4
diyAudio Member
Join Date: Mar 2012
Haha I made it. Thanks for the replies =]

6BA6 Regenerative AM - YouTube
  Reply With Quote


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
Building a tube radio JECalvert Tubes / Valves 17 16th July 2012 12:12 PM
Trying to identify an old radio tube mdalzell Tubes / Valves 7 15th June 2011 06:47 AM
Philips Tube radio Grifon Tubes / Valves 5 20th September 2007 03:40 AM
Help - tube radio JDeV Tubes / Valves 49 19th October 2006 08:18 PM
Another tube radio Magnetmaz Tubes / Valves 7 11th March 2003 06:01 PM

New To Site? Need Help?

All times are GMT. The time now is 09:14 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2