Geoff Roberts Hand Crafted Crystal Radio Parts/div>

Radio Coils



Plug in coil for regenerative radios.


1000-4000 kHz Regenerative Coil

Reaction Radio Coil 1000-4000 kHz 40 µH coil with tickler and aerial winding. Base pin numbering is the same as the Denco . Larger View

P/N
20-151
£ 15.00

1000-4000 kHz Regenerative Coil

Reaction Radio Coil MW Range 160 µH coil with tickler and aerial winding. Base pin numbering is the same as the Denco Green range. Larger View

P/N
20-152
£ 15.00

PAXOLIN COIL FORMER 1.5 inch Diameter x 2 inch Long (37.5mm x 50mm) Larger View

P/N
15-001
£2.00

MW MYSTERY COIL MK1 240 µH Medium wave band mystery coil. Mk1 Larger View

P/N
20-001
£18.00

MW DUAL DIODE COIL MK1 Two Separate Medium wave windings of 240uH plus aerial coupler coil in Centre. Larger View

P/N
20-002
£22.00

2.5 mH CHOKE 2.5 mH RFC, air core. Larger View

P/N
20-003
£12.00

VARIOMETER FOR VALVE RADIOS Just what you need for that one or two valve set. There is a main coil to tune the MW band, an antenna input coil and a rotatable reaction (tickler) coil. Larger View

P/N
20-004
£50.00

LONG WAVE MYSTERY COIL This coil is 1600 uH inductance and measures 7 inches long x 3 inches diameter (175mm x 75mm). I have wound this using my AVO Douglas Winder Machine which produces very precise windings. Larger View

P/N
20-007
£30.00

240 µH COILS Medium wave coil, 3 inch diameter and 2 inches long. Solid brass knurled nuts. Larger View

P/N
20-998
£ POA

LOOSE COUPLER MK2 Dark stained and polished sycamore Base Coil about 10 inches in length overall. Inductance 300µ Henries on main coil which is centre tapped. Secondary coil slides into main coil on a brass shaft. It has six tappings and 200µ Henries in total. Larger View

P/N
20-999
£ POA

240µH, 4.75 Inch Former This spider coil former is made from low loss HDPE. MW wave detectors can be easily wound using 100/45 or similiar litz wire.

P/N
15-004
£ POA

150µH, 4.75 Inch Former This spider coil former is made from low loss HDPE. MW wave antenna tuners can be easily wound using 100/45 or similiar litz wire.

P/N
15-005
£ POA

240µH, 3.50 Inch Former This spider coil former is made from low loss HDPE. MW wave detectors can be easily wound using 40/44 or similiar litz wire.

P/N
15-006
£ POA

150µH, 3.50 Inch Former This spider coil former is made from low loss HDPE. MW wave antenna tuners can be easily wound using 40/44 or similiar litz wire.

P/N
15-007
£ POA

40/44 LITZ WIRE 40 strands of 44 AWG litz wire

P/N
19-001
POA

100/45 LITZ WIRE 100 strands of 45 AWG litz wire.

P/N
19-002
£ POA

MEDIUM WAVE LITZ WIRE MYSTERY COIL 250µH. I wound this coil using best American (Kerrigan -Lewis) litz wire 100/45 type. This coil has a higher Q (magnification factor) than magnet wire coils and will make a more sensitive and selective radio. Litz wire was the most favored by the vintage crystal radio builders of the 1920's and is still the best. Today you cannot get a more authentic looking coils than this particular type.
Larger View

P/N
20-008
£20.00

LITZ WIRE LONG WAVE COIL 2000µH This Mystery type coil is 7 inches long and 3 inches diameter fitted with solid brass binding posts. There is a very tight close wound coupling coil section terninated at two solder tags on end of coil. I wound this on my Avo Douglas hand operated coil winding machine which produces a very precise and even winding.
Larger View

P/N
20-010
£25.00



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