I noticed more tube receivers on ebay than not that the tubes were robbed from the chassis. It appears the sellers are on to the high price of old stock tubes and sell them separately. It is disgusting IMO. Replacement old stock tubes can easily cost more than the receiver itself. Even at the lower prices without the tubes & not knowing the operating condition itself, these receivers are very bad deals. You can likely buy a receiver with tubes in operating condition at lower prices vs buying the receiver & the tubes separately. Stay away folks! A tip regarding the expensive power tubes in a used amplifier or receiver is looking at the tubes. An indicator of tube health is looking at the shiny chrome color getter flash on the tube glass. If reddish/brown or partly burnt away, the tubes are at end of life. A white frosty getter means the tube is dead due to lost vacuum. A set of four NOS (new old stock) power tubes can cost $125 to $400. Four NOS Tung-Sol 6550 can cost $1500!