=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof

=

Tube is fully equivalent

≃

Tube is almost equivalent (a tube replacement without reworking of device circuit)

~

Tube is equivalent in electrical parameters, except voltage and current of filament

≈

Tube is close in electrical parameters, but different in the heating mode, tube design or pins number

[...]

Tube is approximately equivalent

*

Tube is high-durable, long-life, vibration proof or shock proof