Vacuum tube pin connections

- information or data about pin connections for thermionic valves or vacuum tubes

Vacuum Tube / Thermionic Valves Includes:
Basics How does a tube work Vacuum tube electrodes Diode valve / tube Triode Tetrode Beam Tetrode Pentode Equivalents Pin connections Numbering systems Valve sockets / bases Travelling wave tube

Information or data about vacuum tube or thermionic valve pin connections is always useful to have to hand. With the wide variety of tubes that are in use there are many different configurations.

Pin connections were not easy to standardise because of the varying internal construction of the thermionic valves dependent upon their function and the variety of vacuum tube bases available. With single diodes, double diodes, triodes, double triodes, triode pentodes, and many more the variety of configurations and hence the requirements for pin outs is almost endless.

As a result the pin out configuration information for valves are particular to a given vacuum tube and data needs to be sought for each type used.

Image of a Mazda ECH81 triode heptode valve / tube, normally used as a mixer.

Information about a selection of some of the more commonly used vacuum tubes is given below:

Tube type	Pin 1	Pin 2	Pin 3	Pin 4	Pin 5	Pin 6	Pin 7	Pin 8	Pin 9
AZ41	IC	a''	IC	IC	IC	a'	f	f	--
DAF91	-f, g3	IC	ad	g2	a	g1	+f	--	--
DAF96	-f, g3	IC	ad	g2	a	g1	+f	--	--
DF91	-f, g3	a	g2	IC	-f, g3	g1	+f	--	--
DF96	-f, g3	a	g2	IC	-f, g3	g1	+f	--	--
DL92	-f	a	g1	g2	fct, g3	a	+f	--	--
DL94	-f	a	g2	NC	fct, g3	g1	+f	--	--
DL96	-f	a	g2	NC	fct, g3	g1	+f	--	--
EABC80	a'''d	a''d	k''d	h	h	a'd	k'''d, s	g	a
EB91	k'	a''	h	h	k''	s	a'	--	--
ECC81	a''	g''	k''	h	h	a'	g'	k'	hct
ECC82	a''	g''	k''	h	h	a'	g'	k'	hct
ECC83	a''	g''	k''	h	h	a'	g'	k'	hct
ECC84	k''	g'', s	a''	h	h	g'	k'	k'	a'
ECC85	a''	g''	k''	h	h	a'	g'	k'	s
ECC88	a''	g''	k''	h	h	a'	g'	k'	s
ECF80	at	g1	g2	h	h	ap	kp, s, g3	kt	gt
ECF82	at	g1	g2	h	h	ap	kp, s, g3	kt	gt
ECH81	g2, g4	g1	s, k, g5	h	h	ah	g3	at	gt
ECH83	g2, g4	g1	s, k, g5	h	h	ah	g3	at	gt
ECL80	at	gt	k, s	h	h	ap	g3	g2	g1
ECL82	gt	kp, s, g3	g1	h	h	ap	g2	kt	at
ECL83	at	gt	kt	h	h	ap	kp, g3	g2	g1
ECL86	gt	kt	g2	h	h	ap	kp, g3, s	g1	at
EF80	k	g1	k	h	h	s	a	g2	g3
EF85	k	g1	k	h	h	s	a	g2	g3
EF86	g2	s	k	h	h	a	s	g3	g1
EF91	g1	k	h	h	a	g3, s	g2	--	--
EF92	g1	k	h	h	a	g3, s	g2	--	--
EF93	g1	g3, s	h	h	a	g2	k	--	--
EF94	g1	g3, s	h	h	a	g2	k	--	--
EF95	g1	k, g3, s	h	h	a	g2	k, g3, s	--	--
EF97	g1	k, s	h	h	a	g2	g3	--	--
EF183	k	g1	k	h	h	s	a	g2	g3
EF184	k	g1	k	h	h	s	a	g2	g3
EH90	g1	k, g5	h	h	a	g2, g4	g3	--	--
EK90	g1	k, g5	h	h	a	g2, g4	g3	--	--
EL84	IC	g1	k, g3	h	h	IC	a	IC	g2
EL86	IC	g1	k, g3	h	h	IC	a	IC	g2
EL95	g1	k, g3	h	h	a	g2	g1	--	--
EZ80	a'	IC	k	h	h	IC	a''	IC	IC
EZ81	a'	IC	k	h	h	IC	a''	IC	IC

Key
a = anode
f = filament
g = grid - the suffix number indicates which grid
h = heater
IC = internally connected
k = cathode

If a second letter is present it indicates the section of the valve where the element is present in a multi section valve, i.e. ap is the anode of the pentode section of the valve. Where two similar sections are present, e.g. in a valve where two diodes are present then a' indicates the anode for the first section and a'' indicates the anode for the second section.

This list is offered in good faith, no liability can be accepted for errors.