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Poldhu 5 Band Tube valve / Crystal / Op Amp Radio 550KHZ - 27 Mhz DIY KIT

Vendu Voir des articles similaires EUR 22,26 Achat immédiat, EUR 5,86 Livraison, 14-Jour Retours, Garantie client eBay
Vendeur: tgs1950 ✉️ (6.499) 100%, Lieu où se trouve: Redruth, Cornwall, GB, Lieu de livraison: WORLDWIDE, Numéro de l'objet: 302236185882 Poldhu 5 Band Tube valve / Crystal / Op Amp Radio 550KHZ - 27 Mhz DIY KIT . This is a kit you need to solder the parts to the  circuit board.
  • In the valve mode you will need to supply a suitable power supply ( Not Supplied) see instructions 
Built and shipped from UK - dispatched air mail within 3 days.  This is a kit you will need to solder the components.   More pictures to follow.Simple construction- no coils to wind. If you are fascinated  by simple radio this TRF receiver should interest you.  Price includes Diode tube valve, High impedance crystal earphones, indoor aerial. You will need to provide an earth and aerial for HF and other bands. Normally in powered mode and crystal radio mode just an earth is sufficient for the the AM band.  If you want more details please email me.  This radio can work in three modes; As a  Crystal radio.   Change the shorting power tab to the crystal position. Select band 2 to start . Fit an earth connection, switch the valve germanium switch to the G position. Turn the RF gain to maximum. Fit the earphones. In this mode you will need to experiment to see of you also need an aerial. In most case some signals should be received with just a good earth connection. As a powered radio ,This is the most sensitive mode and uses an operational amplifier with feedback. Without the valve in operation. Change the shorting tab to the power position. Fit a 9 volt PP3 battery. Swith the V- G switch to the  G ( Germanium diode position). Fit an earth and/ or aerial. For the higher frequencies an aerial is recommended. Select the band required and use the main tuning capacitor to select stations.  Note about Link A  This link removes the main tuning capacitor from the circuit, this enables the X band to be used. With this link removed and the xband tab in position stations can be selected in the VHF band by tuning the small trimming  capacitor in band X.  Using the receiver  as a pure  Valve Radio   Remove the power tab and fit to the crystal position. Select the V position on the change over swith. Turn the RF gain fully clockwise. Connect  a DC 6 volts 300 mA supply to the valve heaters ( Not Suppled). Frequency selection is the same as other modes. Note the chip is out of circuit and the tube is detecting the signal. This is an example of an early radio receiver. Thermionic emissions are taking place and the valve is detection the radio signal. Warning valve may become warm/hot. Due to tolerance of components frequency ranges are for guidance only.  In the evening on the lower bands a short 1 metre indoor aerial should give good results. A longer aerial and or earth will be required for some bands ( aerial not supplied). Supplied as a kit, you will need to solder the boards. 1. Kit includes everything in the picture  and all components. new tube valve, valve base  Four stand off insulators.  2. battery connector for PP3 battery  3.  assembly instructions  4. Ceramic earpiece ( tested) 4.  Quality circuit board with solder mask.  5. 5 metre indoor aerial     Postage  In order to keep the postage to a minimum postage is for untracked unsigned for. I always obtain a certificate of postage for proof of postage and always dispatch within a couple of days. Please leave feedback so I know you have received the parcel safely. If you require a tracked and signed for parcel I can supply this service for £5 extra please ask for an invoice or add £5 to the postage cost.
  • Condition: Neuf
  • Brand: Poldhu
  • Frequency Band(s): HF
  • Supported Modes: AM
  • Country/Region of Manufacture: United Kingdom

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