I recently acquired a very nice D&A Phantom 500 amplifier in an estate sale. I realize that this is a poor amplifier for any RF work these days, but wonder about the value of the twelve Sylvania 6LQ6 tubes. Looking on eBay, there are over a dozen listings for this tube, so I would like to know where is it used these days - what amps or radios use it. Wondering if it would bring more value to sell it complete with all 12 tubes, or part it out. Thank you for your advice. (Please note this is NOT a "thinly veiled" sales listing. I will follow the rules and put up photos with my call when time to sell).