RECEIVER STC R1082
ACCESSORIES
1. Power Supply
A stabilized power supply was constructed for 2V 1A DC and 120V 12mA DC. The power supply was also equipped with outputs for 4V heater and 3.5V, 35V and 70V bias and anode voltages for my ”Yngve Svensson” vintage valve receiver.
I used two transformers from my junk box, one 30 V and one 2 x 6 V. For the HT I then used a Cockcroft-Walton voltage multiplier giving 4 x the transformer´s 30 V. A chain of zener diodes over the output gives the different needed voltages with high stability.
After the rectifier for the LT I used a voltage stabilizer LM350T for max 3 A, adjusted to give 2 V out to the R1082. Before the stabilizer I tap 4 V for the "Yngve Svensson" receiver heaters.
See the schematic and photo (070105).
2. Head phones adapter
As there is no volume control in the AF part of the R1082 (it is in the RF part), there easily is a much to high volume and also noise from the AF stages in the
phones. A small box was built with a 20 kohm
potentiometer adapted to the receiver output and with
connectors for the high resistance phones and for feeding the loudspeaker system, computer type speakers. To adapt to modern low resistanse phones a transformer would be needed, I did not include that. By decreasing the AF level the volume of the RF can be increased, thus giving a much higher signal to noise ratio in the AF part (070207).
3. Spare valves
Spare valves of the type VR18 and VR21 were given to me by a contact in the UK. VR22 was bought on eBay and a VU33 from Chelmervalves. I am still looking for a spare VR27.
4. Complete coil set
Some time ago I managed to buy a complete set of coils for my R1082 on eBay. The set was unused, had only been on display, and it came in it´s original case with Air Ministry markings! The set has 28 coils, 14 aerial and 14 anode coils, and it covers the frequency range 111 kHz to 15 MHz. In spite of age the coils are as new!
The aerial coils for the lower ranges have connectors for a D/F add-on.
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Updated October 7th 2009