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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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20th Feb 2020, 8:07 pm | #21 |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,548
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Re: Schematic for a simple "One valve radio"
Most of those listed are TV valves. The EF80 was used in radio's as well and is as good as anything to use in a radio. The problem you will have is finding a circuit that actually uses one. The 6J5 is a simple triode valve and could be used and you may find a vintage circuit that uses a single triode. Google 'simple one-valve radio' and see what comes up. You can always check back here.
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20th Feb 2020, 10:24 pm | #22 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,788
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Re: Schematic for a simple "One valve radio"
You can easily wire a pentode as a triode if that's what the circuit requires.
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20th Feb 2020, 10:25 pm | #23 |
Triode
Join Date: Feb 2020
Location: London, UK.
Posts: 21
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Re: Schematic for a simple "One valve radio"
Thanks very much to everyone for all the suggestions and links, I think I need to do a lot of reading and learning before I go ahead. When I do eventually make a valve radio I will post a picture here.
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20th Feb 2020, 10:44 pm | #24 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 947
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Re: Schematic for a simple "One valve radio"
Hi the site http://www.daveysradios.org.uk/ gives lots of details about 1 valve radios i built the bbc studio E set using home wound coil and a 1.5v battery valve type df96 the radio is built on a wooden chasis you can download the building ins. from that webpage or if not i have a copy, the details to make the coil are straightforward but a denco coil will work in this circuit. Details to wind coil
Last edited by mickm3for; 20th Feb 2020 at 10:50 pm. Reason: left details out |
22nd Feb 2020, 6:31 pm | #25 | |
Triode
Join Date: Feb 2020
Location: London, UK.
Posts: 21
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Re: Schematic for a simple "One valve radio"
Quote:
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23rd Feb 2020, 11:52 am | #26 |
Tetrode
Join Date: Jun 2011
Location: Leighton Buzzard, Bedfordshire, UK.
Posts: 88
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Re: Schematic for a simple "One valve radio"
May I second Bazz's view (Post 19), when he advises sticking to a proven circuit design (and I would include its proven components too) for a first project, when it is very important to succeed. I run the Davey's Radios web site, and I gently persuaded one newbie not to stray from this path. He was thrilled when he eventually succeeded! Good luck, Radio88, and if you build a Davey design, get in touch via my web site.
Les. |
23rd Feb 2020, 1:46 pm | #27 | |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,548
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Re: Schematic for a simple "One valve radio"
Quote:
This is absolutely crucial and for that reason if you are a beginner with valves (or a complete beginner for that matter), it's better to start with a circuit that is proven to work, that means using the parts specified or good alternatives. A battery valve is good to start with but remembering that these are very delicate (regarding filament voltage) and will not take any abuse. As previously stated, decide which circuit you want to start with and then ask advice here. It's most important that your first attempt is a success.
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There are lots of brilliant keyboard players and then there is Rick Wakeman..... |
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23rd Feb 2020, 3:13 pm | #28 |
Heptode
Join Date: Jul 2009
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 719
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Re: Schematic for a simple "One valve radio"
I seem to remember a series of articles, with maybe a competition in Radiophile magazine, where the object was to produce a simple radio set using a single valve.
Some of the results were quite inventive, using things such as PCF80 or ECC81 (or similar) and a small low voltage mains transformer for the heater and with voltage multipliers for the HT... also off the heater windings. Sadly I no longer have any copies but maybe someone here remembers the article/s. Clearly, the “high” voltages were actually quite low, and the isolation from the mains provided by the transformer was good for safety. |
24th Feb 2020, 2:13 pm | #29 | |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Schematic for a simple "One valve radio"
Quote:
Secondly, I would advise that prior to 'jumping in at the deep end', you do a bit of studying of the basics of radio receiver design first. That will give you a good grounding in matters you will certainly need to know for a successful result. Finally, good luck with this endeavour. Even us time-withered old hands need a bit of luck now & again! Al. |
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24th Feb 2020, 2:22 pm | #30 | |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Schematic for a simple "One valve radio"
Quote:
Al. |
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24th Feb 2020, 2:33 pm | #31 | |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Schematic for a simple "One valve radio"
Quote:
Al. |
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