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Old 5th October 2012, 11:54 PM   #1
felipemuniz is offline felipemuniz  Brazil
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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) ?
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Old 6th October 2012, 12:51 AM   #2
Eli Duttman is offline Eli Duttman  United States
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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.
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Old 6th October 2012, 01:03 AM   #3
kevinkr is offline kevinkr  United States
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Location: Boston, Massachusetts
One tube radio
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
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Old 6th October 2012, 09:29 PM   #4
felipemuniz is offline felipemuniz  Brazil
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Haha I made it. Thanks for the replies =]

6BA6 Regenerative AM - YouTube
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