This page provides some useful data that may help you repairing valve/non valve equipment. PLEASE NOTE,I CAN SUPPLY VALVE DATA VIA EMAIL OR MY WEBSITE,IF YOU NEED ANY INFORMATION/DATA PLEASE EMAIL ME USING THE SITES CONTACT PAGE STATING WHAT YOU NEED AND I WILL DO MY BEST TO HELP YOU.
VALVERADIO.CO.UK REFERENCE SECTION
RESISTOR COLOUR CHART(4 BAND)
BAND1 BAND2 BAND3 BAND4
1ST DIGIT 2ND DIGIT MULTIPLIER TOLERANCE
BLACK=0 BLACK=0 BLACK=1
BROWN=1 BROWN=1 BROWN=10 BROWN=1%
RED=2 RED=2 RED=100 RED=2%
ORANGE=3 ORANGE=3 ORANGE=1000
YELLOW=4 YELLOW=4 YELLOW=10000
GREEN=5 GREEN=5 GREEN=100000
BLUE=6 BLUE=6 BLUE=1000000
VIOLET=7 VIOLET=7
GREY=8 GREY=8 GOLD=0.1 GOLD=5%
WHITE=9 WHITE=9 SILVER=0.01 SILVER=10%
5 BAND
BAND1 BAND2 BAND3 BAND4 BAND5
1ST DIGIT 2ND DIGIT 3RD DIGIT MULTIPLIER TOLERANCE
BLACK=0 BLACK=0 BLACK=0 BLACK=1
BROWN=1 BROWN=1 BROWN=1 BROWN=10 BROWN=1%
RED=2 RED=2 RED=2 RED=100 RED=2%
ORANGE=3 ORANGE=3 ORANGE=3 ORANGE=1000
YELLOW=4 YELLOW=4 YELLOW=4 YELLOW=10000
GREEN=5 GREEN=5 GREEN=5 GREEN=100000
BLUE=6 BLUE=6 BLUE=6 BLUE=1000000
VIOLET=7 VIOLET=7 VIOLET=7
GREY=8 GREY=8 GREY=8 GOLD=0.1 GOLD=5%
WHITE=9 WHITE=9 WHITE=9 SILVER=0.01 SILVER=10%
OLDER RESISTOR COLOUR CODING
With older resistors you did not have a band system,but a "dot" system,the body of the resistor was coloured,the tip was coloured and then there was a spot of paint on the body of the resistor. The colour coding was exactly the same as for modern resistors. READ IN THE FOLLOWING SEQUENCE..BODY,TIP,SPOT. If the body was red,the tip was orange and the spot was brown the resistor would be 230 ohms.
BODY=1ST DIGIT.....TIP=2ND DIGIT.....SPOT=MULTIPLIER.
CAPACITOR CONVERSION TABLE
1PF=0.001NF
10PF=0.01NF
100PF=0.1NF=0.0001UF
1000PF=1NF=0.001UF
10000PF=10NF=0.01UF
100000PF=100NF=0.1UF
1000000PF=1000NF=1UF
SLEEVE COLOUR IDENTIFICATION USED IN OLDER GEC RADIOS
White...high potential connections to the aerial circuits,first section of the bandpass circuit and non-earthy side of the speech coil.
Green...grid connections and high potential ends of signal circuits.
Blue...screening grid circuits.
Pink...cathode connections
Orange...connections to valve anodes.
Black...earth wiring.
Slate...h.t. negative when not connected to earth.
Red...h.t. smoothed.
Red/White...h.t. unsmoothed. Where smoothing choke is in positive leg.
green/white...grid decoupling and a.v.c. circuits.
black/red. black/white. heaters
black/red...l.t. positive in battery sets.
BATTERY WIRE COLOUR CODE IN OLDER RADIOS
red...highest positive voltage.
maroon/red...2nd positive voltage.
maroon...3rd positive voltage.
black with red tracer...negative h.t.
yellow...positive l.t. voltage.
black with yellow tracer...negative l.t. voltage.
green...positive bias voltage.
black with green tracer...maximum negative bias.
black/green...2nd negative bias.