Some diode japonese - Panasonic

[konan]

I dont know what type is, it is broken.
Someone sugestion, substitution ?

[Altra]

Just a wild guess. But it may be a 6.8v zener. Blue band = 6 and grey equals 8.

Google search diode color code

[Carl-NC]

See if this helps:

https://w.atwiki.jp/mcmaster/pages/273.html

[Skippy]

Are there any similar diodes in this equipment? Maybe it is a zener diode of 6.8 Volts. If there are other ones with other colour bands, remove one and test it to see if it's a zener that matches its colour band code.

[konan]

There is no similar part of diodes that is like them, so I cant test it, it is broken.

[konan]

From that place I conclude that it can be "

Variable capacitance diode for AFC of UHF and VHF tuner.Discontinued.Old No. (MA840).

"
I dont know what substitution is.

See if this helps:

https://w.atwiki.jp/mcmaster/pages/273.html

[Carl-NC]

Do you have, or can you trace out, any of the surrounding circuitry? What kind of circuit is it?

[konan]

I dont have scematic, bat this is input of oscilloscope probe, NATIONAL VP-5320A

[Skippy]

It's not going to be a zener, in that location.
It is possibly a 1N68 germanium diode, described as 'gold-bonded'. They are normally packaged in that glass body, DO-7, I think..
Gold-bonded diodes have a lower forward voltage drop compared to point-contact types. The OA47 is a common gold-bonded type.