unidentified component

[radio10]

This looks like a 1N4148 at first glance, orange in colour inside a
glass body.Nothing printed on it at all. No band indicating polarity. I
can't test it as it's open circuit. It is connected to the gate of a
BT136 triac. The unit is a professional flash 'head' used in
photographic studios. I am guessing here, but I think it could be
either some kind of low value fuse, or surge protector?

 

[Ron(UK)]

This looks like a 1N4148 at first glance, orange in colour inside a
glass body.Nothing printed on it at all. No band indicating polarity. I
can't test it as it's open circuit. It is connected to the gate of a
BT136 triac. The unit is a professional flash 'head' used in
photographic studios. I am guessing here, but I think it could be
either some kind of low value fuse, or surge protector?

Sounds like it could be a diac.

Ron(UK)

 

[radio10]

Sounds like it could be a diac.

Ron(UK)

Many thanks for your fast reply Ron. Just found it in the Rapid
catalogue following your advice!

 

[Eeyore]

This looks like a 1N4148 at first glance, orange in colour inside a
glass body.Nothing printed on it at all. No band indicating polarity. I
can't test it as it's open circuit. It is connected to the gate of a
BT136 triac. The unit is a professional flash 'head' used in
photographic studios. I am guessing here, but I think it could be
either some kind of low value fuse, or surge protector?

Diac quite likely. They're pretty much interchangeable - normally with a
breakdown voltage ~ 30V. It's a trigger device.

Oh - it may indeed be fine, it's open circuit until it triggers.

Graham

 

[radio10]

Diac quite likely. They're pretty much interchangeable - normally with a
breakdown voltage ~ 30V. It's a trigger device.

Oh - it may indeed be fine, it's open circuit until it triggers.

Graham

Many thanks for this Graham. Component identified!

Richard