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27th January 2008, 06:59 PM
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#1 |
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diyAudio Member
Join Date: Oct 2005
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Does anyone recognise this 12AU7?
I purchased these 6 tubes in an ebay auction:
Does anyone recognise the 'donut' shaped logo on the third tube from the left? I think the others are (from left): Brimar, Marconi, ?, Amperex, Telefunken, Mullard. |
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27th January 2008, 07:38 PM
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#2 |
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diyAudio Member
Join Date: Oct 2007
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Looks to me like the trade mark of Bentley Acoustics. They were a company that supplied valves by mail order but the country of origin was variable. I have for example a Bentley Acoustics 5Z3 that was made by Westinghouse in Canada. I think they re-badged a lot of ex-military valves and also many from other countries like Italy, Germany and Russia. Pinnacle and Z & I Aero were similar companies.
Les |
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