advice? Value of Gold Aero 7308s??


I found a quad of Gold Aero 7308s I bought decades back now and I'm a bit confused as to what their value on the secondary market would be. Can anyone give me a bit of a helping hand here? I can't seem to find much in the way of recent sales records for ebay or otherwise. I'm GUESSING I should sell these as two pairs (assume most preamps use only two of them?). Hints? Suggestions? I'd appreciate any advice I can get on the matter - thanks.
jw_dewdney
Real 7308's were made by Amperex and have numbers etched into the glass. Amazing tube.....
I would be careful about selling them for little money before some research. 7308's were made and/or sometimes rebranded by Amperex, Siemens, Sylvania, Raytheon, and probably others as well. If you can post a close up of the tube, I am sure they can be indentified. Remember, these are decades-old and Amperex 7308's (a GREAT tube) did not cost $300 back then. Gold Aero was known to select premium samples of Amperex tubes for their own brand. You could very well have some very good and very valuable tubes.

This image of a Gold Aero 7308 sure looks like an Amperex to me:

https://www.google.com/search?q=gold+aero+7308&hl=en&client=safari&tbm=isch&tbo=u&source=univ&sa=X&ei=PMtVUYieFNWo4AOm04HIBA&ved=0CDUQsAQ&biw=1024&bih=672#biv=i%7C1%3Bd%7CQopwsV8Q7RGBOM%3A

However, this one does not:

https://www.google.com/search?q=gold+aero+7308&hl=en&client=safari&tbm=isch&tbo=u&source=univ&sa=X&ei=PMtVUYieFNWo4AOm04HIBA&ved=0CDUQsAQ&biw=1024&bih=672#biv=i%7C2%3Bd%7C6Ls7VaBf8qGAEM%3A

Good luck.
Fear not Frogman, Jw does not appear to be giving them away. Here is a link to his ad.