Sound quality is great, sounds as good as FM! I wish stations here in the UK would not limit their bandwidth or I'd try this myself. I'm surpised using switchmode power supplies didn't interfere with the reception.
Nice project. Vacuum tubes are a mystery to me. I must read up on how they work. That's a great idea to use thumb tacks to make solder points on a wooden board. BTW: In the UK we call vacuum tubes, (thermionic) valves, whilst thumb tacks are called drawing pins. :-p
*Nice Thumbtack Construction... interesting...* Reminds me of an old song (keep gunpowder dry or it won't work if you need it): "No need to be so shy Just keep your _wood_ dry"
suprised that the Switch mode frequency didnt cause the switching noise . The tube didnt look like 6AH5 , as i remember 6AH5 is short bulb triode.. maybe you can try to add a feedback coil into it to make a regenerative radio.. i think it will give more gain.
what is the logic for the primary / secondary turn ratio for building the antenna coil ? the one with cap is matched for resonance frequency, but what about the other side coil ?
ok, so that kind of ratio should i look for ? lets say tuner calculation gave me a turn number of 80 for the 20pf cap i have for tuning into the desired frequency.
0:20 At nineteen point three volts, ypu cannot really call that low voltage! Ever hear of the Cummings SOLODYNE receiver, which used "starved amplifier crktry?
0:10 No no, this 6HA5 tube has a separately heated cathode, that means a stepped down AC power supply. Using an MP3 amplifier-speaker is a cheat. Also why not 18V for the B+? Two 9V xsistor batteries connected in series can supply that.
That would be fun to build with one of the grandsons. I remember all my tube projects back in the 60's and all the transformers!
Love the thumbtacks idea
Sound quality is great, sounds as good as FM! I wish stations here in the UK would not limit their bandwidth or I'd try this myself. I'm surpised using switchmode power supplies didn't interfere with the reception.
Like the thumbtack terminals; quick and easy.
cool project
5:35 I have always found it difficult for solder to adhere to these "metal-head thumbtacks"
Nice project. Vacuum tubes are a mystery to me. I must read up on how they work.
That's a great idea to use thumb tacks to make solder points on a wooden board. BTW: In the UK we call vacuum tubes, (thermionic) valves, whilst thumb tacks are called drawing pins. :-p
*Nice Thumbtack Construction... interesting...* Reminds me of an old song (keep gunpowder dry or it won't work if you need it):
"No need to be so shy
Just keep your _wood_ dry"
suprised that the Switch mode frequency didnt cause the switching noise . The tube didnt look like 6AH5 , as i remember 6AH5 is short bulb triode.. maybe you can try to add a feedback coil into it to make a regenerative radio.. i think it will give more gain.
How can you make any decent smoke with only 19 volts?
what is the logic for the primary / secondary turn ratio for building the antenna coil ? the one with cap is matched for resonance frequency, but what about the other side coil ?
It's for impedance which creates sharper tuning.
ok, so that kind of ratio should i look for ? lets say tuner calculation gave me a turn number of 80 for the 20pf cap i have for tuning into the desired frequency.
why is there a small SMPS on it again ? and what is the "choobe" for ? just audio amp ?
I think you are referring to a small switching power supply that sets the filament/heater voltage on the tube.
Operates on sausage biscuits and diet dew lol
What about using miniaturized tubes would they work?
Sure they would. a 6CW4 type was a high-gain triode used in VHF amplifiers years ago.
@@LewisLoflin CK5784 = 5784 Would that work in a portable radio? www.radiomuseum.org/tubes/tube_ck5784.html
@@travismoore7849 It is more mixer than an amplifier. It could work. I would have to build a circuit and test it to be sure.
0:20 At nineteen point three volts, ypu cannot really call that low voltage!
Ever hear of the Cummings SOLODYNE receiver, which used "starved amplifier crktry?
19V compared compared to 120V or 220V is low voltage.
What about the KORG NUTUBE 6P1?
Won't work with this circuit.
KORG NUTUBE 6P1 only requires 1v for the heater and works between 9v-50v, or what about www.qsl.net/m0ayf/VFD-Regen.html
0:10 No no, this 6HA5 tube has a separately heated cathode, that means a stepped down AC power supply. Using an MP3 amplifier-speaker is a cheat. Also why not 18V for the B+? Two 9V xsistor batteries connected in series can supply that.
The heater works fine on DC and an 18-volt PS is what I had.
What about TELEFUNKEN Space Charge Vacuum tubes with a B+ of 9-90V and a H+ of 1.5-3V
I have a few of those but the heater is 12V. They work fine at 12V.
Update of an old classic and an earlier video..
Old video: ua-cam.com/video/dY84wQASrwM/v-deo.html