im currently working on my tube FM receiver. but two tubes where not enough...i always have to overexaggerate haha. currently 9 tubes on the chassis. (rectiver and magic eye EM84 included) im close to present it soon. have fired it up 2 days ago but it needs some tweaking and debugging.
@NJPurling, hi and thanks for your comments. I´ve answered the coil question to @rockangel1967, read that reply for info. The tubes are two Double-Triode (UCC85 running at 27v) but it could be using PCC85 and other equivalent triodes running at different voltages. I suspect my construction could be MUCH better as the audio volume is rather low for what it could do.
hello. i also just did a regen AM radio. may i ask you what variable capacitor you were using? and can you give me infos about your coil? what thickness of wire and how many windings etc..? thank you
@rockangel1967, the coil wire is 7mm thick, the diameter for the coil is 30mm, the number of windings are 63 (if I´m remembering correctly), and there´s 5 bleed points, where one is for the regen. The capacitor is an 20-120 pf thing, but the band is quite narrow so less will do.
In theory, that should work - because I made a 5-transistor Regen too, and that works exactly as you describe, this one however, just get a lot of noise when pushing the regen control too far.
im currently working on my tube FM receiver. but two tubes where not enough...i always have to overexaggerate haha. currently 9 tubes on the chassis. (rectiver and magic eye EM84 included) im close to present it soon. have fired it up 2 days ago but it needs some tweaking and debugging.
rockangel1967 6 months ago
What are the valves you used?
I am also curious about the coil.
I have made AM radios & have one with a single EF39 (6K7).
I kept the amplifier separate for the sake of hum reduction. I can also use the amp with my record player and have stereo.
Is the audio stage using a normal audio output valve?
I guess that you don't want to put too much power into that tiny speaker anyway.
NJPurling 9 months ago
@NJPurling, hi and thanks for your comments. I´ve answered the coil question to @rockangel1967, read that reply for info. The tubes are two Double-Triode (UCC85 running at 27v) but it could be using PCC85 and other equivalent triodes running at different voltages. I suspect my construction could be MUCH better as the audio volume is rather low for what it could do.
Jo0ngle 9 months ago
hello. i also just did a regen AM radio. may i ask you what variable capacitor you were using? and can you give me infos about your coil? what thickness of wire and how many windings etc..? thank you
rockangel1967 1 year ago
@rockangel1967, the coil wire is 7mm thick, the diameter for the coil is 30mm, the number of windings are 63 (if I´m remembering correctly), and there´s 5 bleed points, where one is for the regen. The capacitor is an 20-120 pf thing, but the band is quite narrow so less will do.
Jo0ngle 9 months ago
@Jo0ngle thanks
rockangel1967 9 months ago
Cool speaker, i'd never seen one like that before, where'd you get that ? A LCD TV ?
zaprodk 1 year ago
@zaprodk
I found them inside a big bulky Sony TV set. Since everyone wants flat-screen TVs, people throw out perfectly good working TV's.
Jo0ngle 1 year ago
In theory, that should work - because I made a 5-transistor Regen too, and that works exactly as you describe, this one however, just get a lot of noise when pushing the regen control too far.
Jo0ngle 2 years ago
Bravo!
hrbear 2 years ago