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rare tube: F3U-2

 
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arubli



Joined: 19 Jul 2004
Posts: 2
Location: mexico
PostPosted: Sat Jul 11, 2009 1:59 am    Post subject: rare tube: F3U-2 Reply with quote
Hi
I came across a rare tube which I cannot locate
its a russion tube labeled as 03Y-2 (roman equivalents F3U-2)
it appears at the input of an audio amplifier.
have no idea of its function

any help will be appeciated

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thanx

Alex rubli
alex@rubli.net
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