Virtually all these firms specialise in hard-to-find material but read the whole list to find the people most likely to have what you want....

• AGILE TOOLS, Box 1408, London, NW10 9ES (020-8452 6724). Early ICs and transistors.
• ANTIQUE AUDIO, 253 Blanche, Plymouth, MI 48170, USA (00 1 313-455 4169). High-voltage capacitors and other components for valve circuitry.
• ANTIQUE ELECTRONIC SUPPLY, Box 27468, Tempe, AZ 85285-7468, USA (00 1 602-820 5411, fax 00 1 602-820 4643). Comprehensive source of tubes, parts and supplies for restoring old radios. Elaborate 32-page catalogue free, mail order a speciality, credit cards taken. E-commerce enabled web site at http://www.tubesandmore.com
• Michel BLANCHARD, 21 Lot Miailhe, F-33720 Barsac, France (00 33 5-5627 0523 after 20.30 local time). Supplies cotton-covered wire.
• BULB DIRECT, Inc. 1 Fishers Road, Pittsford,NY 14534-9511, USA (00 1 800-772 5267, 00 1 716-385 3540, fax 00 1 716-385 4976 or 00 1 800-257 0760) Specialist instrument bulbs and other types of lamp. http://www.bulbdirect.com/
• W. BURCHER, 676 Foxhall Road, Ipswich, IP3 8NQ. Valves and some other valve-era spares.Advertised a closing down sale so may have ceased trading.
• CENTRE ELECTRONICS, 345 Stockfield Road, Yardley, Birmingham, B25 8JP (0121-706 0261). Open Thursday-Saturday. Valves and other components.
• CHELMER VALVE COMPANY LTD., The Stables, Scatterbrook Farm, Rectory Lane, Latchingdon, Essex, CM3 6HB. Tel: +44 (0)1621 745450. Fax: +44 (0)1621 745459. Email: sales@chelmervalve.com  Website: www.chelmervalve.com  Good stock of brand name valves, particularly audio.
• COMPAERO (http://www.compaero.com/) Military-type connectors of all kinds.
• CONNECTOR WORLD SUPPLY, Inc., Seattle, USA (00 1 206-789 7525). Huge selection of plugs and sockets.
• DIAL ELECTRONICS Ltd., Unit E, Burnhope Road, Washington, Tyne and Wear, NE38 8HZ. UK. Tel: 00 44 (0) 191 4177003. Fax: 00 44 (0) 191 4177053. Large resource for audio, radio parts and semiconductors. Website: www.dialelec.com
• DIVERSE DEVICES, 75 Priory Road, St Denys, Southampton, SO17 2JQ (tel/fax 01703-584680). Large quantity of manuals and hard-to-find components, including some germanium transistors.
• DOUGLAS ELECTRONICS INDUSTRIES Ltd, 55 Eastfield Road, Louth, LN11 7AL (01507-603643). Wide range of transformers for 'valve' type HT voltages.
• DYPROM Ltd, 0115-844 0333, fax 0115-844 0338, dypromsales@innotts.co.uk . Specialist suppliers of Plessey, Harris and Mitel semiconductors, including obsolete types.
• ELECTRONIQUE DIFFUSION, 15 rue de Rome, 59100 Roubaix, France (00 33 3-2070 2342). RF components including old-pattern valves.
• ETC ELECTRONICS, P.O. Box 253 Sandy, Utah 84091-0253. They buy and sell hard to find - new, old, vintage, obsolete, and current electronics parts and supplies. They sell: IC's, Tubes, Antique Radios, Test Equipment, Diodes, Relays, Capacitors, Industrial, Security, Lamps, LED's, Displays, Vintage Hi-Fi, etc. Web site: www.etcelectronics.com
• F.C. LANE ELECTRONICS Ltd, Slinfold Lodge, Slinfold, Horsham, RH13 7RE (01403-790267, fax 01403-790849). Specialises in obsolete multipole connectors and has taken over the manufacture of some ranges, e.g. Plessey Company.
• Jean-Luc FRADET, 9 rue de l'Égalité, 36130 Déois, France (00 33 2-5434 4951). Components for old radio and hi-fi, repairs.
• W.W. GRAINGER, USA (00 1800-323-0620). Acclaimed as a source of unusual bulbs such as lumiline tubes for Collins speakers and 656s for Johnson transmitters. The phone number is their order number.
• KAL UK Ltd, Box 84, Herne Bay, CT6 7GA; KAL Germany, Kraichbachstr 1a, D-68766 Hockenheim, Germany (tel/fax 00 49 6205-16504). Buy/sell vintage valves and audio equipment.
• KENZEN, Unit 9, 16-20 George Street, Balsall Heath, Birmingham, B12 9RG. (0121-446 4346, fax 0121-446 4245). Valves and valve-era components. Catalogue issued. Please ring for an appointment if you intend visiting the warehouse). This business also has an extensive range of new-production high-voltage electrolytics at advantageous prices. These are good quality, British-made caps, in fact the same brand as the Vintage Wireless Company of Bristol used to sell. They are ideal for replacing problematic caps in old valve equipment. Information sheet/price list will be sent in return for SAE.
• LUMITRON Corporation, Box 267, Summit, NJ 07902, USA (00 1 908-273 8998, fax 00 1 908- 273 0853). Specialist instrument bulbs and other types of lamp. www.lumitroncorp.com
• MAJESTIC TRANSFORMER COMPANY, 245 Rossmore Road, Parkstone, Poole, BH12 2HQ (01202-734463). Rewinds old transformers.
• MICROLAMP. Inc., 2942 NW 60th Street, Ft. Lauderdale, FL 33309, USA (00 1 800 431-4956 or 00 1 954-9707171, fax 00 1 954-970 7196). Specialist instrument bulbs and other types of lamp. http://www.microlamp.com/
• H.J. MORGAN-SMITH, Unit 3, Vernon Bldg., Westbourne Street, High Wycombe, HP11 2PX (01494-532421). Stock item and custom instrument cases, 19" rack cases & other metalwork spraying.
• Bill MORRIS builds working replicas of the most popular American and British LT, HT and combination radio battery packs. The finished batteries look, feel and work just like the originals. The covers are vintage-looking as well. Email: batterymaker@gmail.com
• MUSHROOM COMPONENTS, Unit 3 Bradfield Road, Finedon Road Industrial Estate, Wellingborough, NN8 4HB (01933 -275345, fax 01933-275245). Stocking distributor of electronic components specialising in obsolete semiconductors. Website at http://www.mushroom.co.uk
• OLD TIME SUPPLIES, PO Box 209, Banbury, OX16 1GR. Old radios, books and components. E-mail: sales@oldtimesupplies.co.uk Website: http://www.oldtimesupplies.co.uk
• PREMIUM PARTS, Whitewater, WI, USA (00 1 800-558 9572, fax 00 1 800-887 2727). Comprehensive source for all kinds of drive belts and wheels for tape recorders. They can custom-make stuff, too.
• PROBUS ELECTRONICS Ltd., Findon, Southill Lane, Eastcote, Pinner, HA5 2EQ (020-8866 7272, fax 020-8866 2999). UK distributor of production and servicing products made by Caig Laboratories (USA).
• RATA Ltd, Edge Bank House, Skelsmergh, Kendal, LA8 9AS (01539-823247, fax 01539-823317). Some valves, valve bases and coolers, also high grade audiophile components and cables.
• ROCHESTER ELECTRONICS, 10 Malcolm Hoyt Drive, Newburyport, MA 01950, USA (00 1 508-462 9332). Specialises in long-obsolete integrated circuits. Website at http://www.rocelec.com/
• 6V6 VINTAGE COMPONENTS, 3 Baskerville Road, Wandsworth Common, London, SW18 3RJ. Web site: www.6v6.co.uk. A UK source of radio and audio restoration products and spare parts from the 1920's to the 1980's. E-commerce facility now online. They can supply valves, high voltage capacitors, radio kits (based on 1920's designs), transistors, crystal set spares (original and reproduction), and some downloadable circuit diagrams - free when you buy anything.
• STIFFKEY LAMP SHOP, Stiffkey, Wells-Next-Sea, NR23 1AJ (01328-830460). Fabric-covered mains cable (looks better than PVC-sheathed flex on vintage receivers but has modern blue, brown, yellow-green wires inside). Available in two colours, gold and dark brown; the conductors are twisted and each has its own fabric covering.
• T&J ENTERPRISES, Box 1963, Hall Green, Birmingham, B28 9LP (0121-777 3386). Specialist suppliers of Lucas electrical spares 1930 to date. Mainly automotive but many parts used in other low-voltage applications (e.g. festoon bulbs in radios).
• TECHNICAL LAMPS Ltd, 020-8979 6652. Projector lamps and other specialist items.
• VINTAGE TV & RADIO SUPPLY, 3498 West 105th Street, Cleveland, OH 44111, USA (00 1 216-671 6712). Components, refinishing supplies, reproduction parts, books and literature. Free catalogue.
• WHITE TOWN VINTAGE, 50 Meddon Street, Bideford, EX39 2EQ (01237-424280, fax 01237-424280), e-mail: white.vintage@virgin.net Tudor Gwilliam Rees' new vintage electronics business following his sale of Savoy Hill Publications. He buys and sells most British audio, repairs vintage radios and supplies vintage-compatible capacitors and other parts. Also he now can repair damaged CDs and DVDs !   A monthly news sheet is available.