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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Valvo Codes posted by Russ57 on February 8, 2007 at 08:07:23:
Russ' info is good, except . . . you'll find the type code on the shortplates is actually Gf0, not GF0, these are case sensitive! Gf is indeed 12AU7. In fact, you'll find it on Philips 12AU7s from other plants, but these will have different factory code, like the "delta" for Heerlen, etc., rather than the Hamburg "D".Also, the dates given above are the only ones that fit the data provided; there were no Hamburg k62s other than in the 1950s, etc.
Jeff
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Follow Ups
- Re: Valvo Codes - Jeff A W 08:28:49 02/08/07 (1)
- Thanks, Gf is missing on my list(nt) - Russ57 08:38:33 02/08/07 (0)
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