Hello, I have for sale a new matched pair of RF parts 3-500ZG Transmitting Tubes, I bought these as backup tubes for my Healthkit SB-220 Amplifier. I ran them for 1/2 hour just to make sure they were working correctly. I then placed them back into the original boxes. And then inside the shipping carton, they came in from RF PARTS. I did not think to take photos of the tubes at that time. I did not plan on ever selling them at that time. But someone made me a very good offer on my rebuilt SB-220. And told me they did not need the new tubes. I am a very honest person and have sold so many amps and transceivers along with microphones on this forum. You can also look at my feedback on eBay under the same name. I am asking $385.00 including shipping cost. lower 48 states only. Payment is to be made through PayPal gift. Sold as is. If you are really sure you want them? If need be I will take them out and take photos.