Lockdown Vintage Audio Activities...

[Peter.N.]

That's interesting. Spectrum Communications is not far from here. They converted my CB rig to the 10 meter amateur band when I got my license in the '80s.

Peter

[xantia_v6]

Any idea about the date and origin of these transistors? I found a bag of about 30 of them while tidying the garage. I think that they are germanium PNP, but they are unmarked, and the case style is not one that I recognise.

My transistors

[Peter.N.]

I have seen them and am pretty certain they are from the '50s/'60s but cant remember what I have seen them in. If they are Germanium and PNP they would almost certainly be from the '50s as all the early transistors were PNP although most of the very first ones I came across were the Mullard 0C series which were plastic rather than metal - except the 0C16 a beefy single ended output transistor for use with hybrid car radios it worked brilliantly too.

Peter

[myglaren]

They look similar to the ones in my Beomaster receiver from the sixties, long gone now.

Which were Germanium.

[mickthemaverick]

It looks to me like they are either 1960's Sony 2SC73's. as shown as item no 12 or (more likely) unmarked as shown as item no 20 on this website:
http://www.ultraelectronicactive.com/el ... Tubes.html

[xantia_v6]

It looks to me like they are either 1960's Sony 2SC73's. as shown as item no 12 or (more likely) unmarked as shown as item no 20 on this website:
http://www.ultraelectronicactive.com/el ... Tubes.html

Yes that is well spotted!

I also found a couple of LASCARs (Light Activated Silicon Controlled Rectifiers) that my dad bought for some project in the 1970s. A technology that disappeared very rapidly (I could never think of a practical use).

[mickthemaverick]

I also found a couple of LASCARs (Light Activated Silicon Controlled Rectifiers) that my dad bought for some project in the 1970s. A technology that disappeared very rapidly (I could never think of a practical use).

I remember using LASCARs to control cupboard lights in the early fitted kitchens. They were set inside the cupboard and on opening the door the influx of ambient light caused the LASCAR to switch on the cupboard light. Long since replaced by PIR technology