Seller misrepresnted tube as an F9815SLG with data sheet. Unit stopped working after 10 minutes. During troubleshooting it was discovered the tube was not even close to the high end tube described. Serial and model numbers did not match. The tube it contains is not rated for use in pvs 14s. The seller refuses to right the situation in any way. This is the first time I have been scammed in years of trading. Buyers beware. I will be pursuing legal action.