Found this in a batch of tubes I bought. Haven't heard of Sonotron before so I'm curious as who the manufacturer is. I guess not in the first rank. It has unusual silver deposits on the sides and round plates. Any guess?
I thought for a moment that I had a valve radio of the same brand, but it's a Sonorton rather than a Sonotron. (The text on its tuning scale is in French and the only information I have about it came from a French website and a Frenchman.)
Found an ebay listing with what appears to be the same tube, with the round plates and silver blobs on one side. Also, notice that the glass at the bottom is pinched in a bit, like it was rolled while the glass was still soft.
https://www.ebay.com/itm/1969650115...PN20H9&hash=item2ddc079079:g:jXUAAOSwJvBnkhQJ
jeff
"These valves have the grey Tungsram rounded anode with the two rounded holes in the centre of anode plate and the slated hole at the top and bottom of the anode plate.
These are covered by the silver black flashing which was part of the Tungsram factory manufacturing process. They all have the Tungsram two digit code on a chrome plate located at the bottom of the getter support."
Source:
https://www.watfordvalves.com/product_detail.asp?id=8044
These are covered by the silver black flashing which was part of the Tungsram factory manufacturing process. They all have the Tungsram two digit code on a chrome plate located at the bottom of the getter support."
Source:
https://www.watfordvalves.com/product_detail.asp?id=8044
More than three decades ago I thougt about the metal flash as sign of worn out. But the yellow letters show new tube, because the paint material will be grey after first heating.
https://www.diyaudio.com/community/...r-a-vintage-class-a-b-power-amplifier.379510/
"Sonotron as a brand existed only for a few years in the seventies until the production got moved and they changed the name to adyton. A name that are more known and are still known today ."
Adyton is an Norwegian firm.
"Sonotron as a brand existed only for a few years in the seventies until the production got moved and they changed the name to adyton. A name that are more known and are still known today ."
Adyton is an Norwegian firm.
This game is over even before it started! Thanks all. I think I have another Tungsram EL84 in my boxes so I'll make a comparison tomorrow. When I did my initial search I found a Sonotron tube by a Norwegian vendor, so that fits well with euro21's link above. So, tube made by Tungsram in Hungary for Sonotron in Norway.
I have a lot of PL508 with "AEG" mark, one "Telefunken" and cca. 100 pcs of original Tungsram. They are totally identical, except the brand. The Tungsram company made tubes without any letter, named as "neutral".
Found the Tungsram EL84 in the corner of a box with power tubes for my Dynaco ST35. No doubt that they are from the same manufacturer.
The only code printed on the Sonotron is "66", not the usual Tungsram letter/number code (e.g. M3). Maybe 1966?
The metal stamp mentioned in a post above can be seen here, it's "88". Don't know what it means.
So, two Tungsram EL84 in my collection. Wonder if that pair will ever come of use...
The only code printed on the Sonotron is "66", not the usual Tungsram letter/number code (e.g. M3). Maybe 1966?
The metal stamp mentioned in a post above can be seen here, it's "88". Don't know what it means.
So, two Tungsram EL84 in my collection. Wonder if that pair will ever come of use...