Bargains on ebay? (Part 2)

[The Barbarian]

Unusual Kefs.........

http://www.ebay.co.uk/itm/Kef-Cantat...item35e48134f8

They were an oreyt speaker those 'Catana's.. the smaller 'Calinda's were oreyt anorl.

[Audio Al]

good luck

OH BUM , the listing has ended

[hermit]

OH BUM , the listing has ended

nae luck Al.

[StanleyB]

This is a rare offer in many ways: http://www.ebay.co.uk/itm/NOS-NIB-GI...item41892447e2
It's not clear from the description which of the two items is on offer.

[Barry]

This is a rare offer in many ways: http://www.ebay.co.uk/itm/NOS-NIB-GI...item41892447e2
It's not clear from the description which of the two items is on offer.

The seller can't even spell: "VACCUME" (sic).

[walpurgis]

The seller can't even spell: "VACCUME" (sic).

At least it has "no looose parts". Not sure about her though.

[Barry]

At least it has "no looose parts". Not sure about her though.

I didn't get as far as reading the description, but was amused to see a radiation warning notice on the packing crate.

[BTH K10A]

I didn't get as far as reading the description, but was amused to see a radiation warning notice on the packing crate.

Quite a few vlaves have radiatio warnings on them Thorium Oxide is a low level radioactive substance and the yellowish green glass at the bottom of the valve will most likely be Uranium glass, commonly called Vaseline Glass which again is mildly radioactive and glows bright green under flourescent light. Uranium glass provides a better seal to large connector pins over a wider temperature range than normal glass.

[Barry]

Quite a few valves have radiation warnings on them Thorium Oxide is a low level radioactive substance and the yellowish green glass at the bottom of the valve will most likely be Uranium glass, commonly called Vaseline Glass which again is mildly radioactive and glows bright green under flourescent light. Uranium glass provides a better seal to large connector pins over a wider temperature range than normal glass.

The radiation warning is most likely to refer to the uranium glass. Thorium oxide, as used in the cathode/heater, is an alpha emitter, however the alpha particles would be easily absorbed by the glass envelope.

[BTH K10A]

The radiation warning is most likely to refer to the uranium glass. Thorium oxide, as used in the cathode/heater, is an alpha emitter, however the alpha particles would be easily absorbed by the glass envelope.

Yes Thorium is principally an alpha emitter but it's not unheard of that it can also emit small quamtities of beta and gamma radiation.

I have some thoriated valves with noe uranuim glass that have radioactive warning notices so I would assume there are warnings wherever there is the sightest possibility of any type of radiation including alpha particles when the containment is fragile.