Can anybody identify this ...?

[bigbassman]

I bought this little item off Ebay years ago and I'm darned if I can remember what it is.Its made by a company called S.E.M. Union Mills,Isle of Man.Can any one tell just by looking,what it is?It may be a pre-amp but I'm not sure.Power (12v) is via a phono socket.Any pointers would be appreciated.PS the blue on-off switch was put there by me.Many thanx.

[crusty]

I believe is an SEM 2M/VHF preamplifier.

[bigbassman]

Cheers Crusty,thats what I thought it might be.Can you tell by its innards or do you just recognise it for what it is? I'd be interested to know.

[crusty]

Based on the BFR90 transistor (transition frequency of 5GHz+), small ferrite transformer, general layout. Fairly representative of VHF construction of the time. Have you tested it out at different frequencies?

Someone re-soldered the coax shield, something I've had to do with my SEM Multi Filter. Had a few bits of their kit. Their later stuff seemed to skip the labeling dep't for some reason, and the solder joints always needed attention.

[bigbassman]

It seems to work OK on airband Crusty,which is my main interest anyway.If I can get a suitable 12v outboard battery fitted it'll do for outdoor workat some stage.Thanx for your input.Much appreciated.