I opened a circa-2005 TV tuner VHF/UHF "can" from an 19" CRT Emerson TV and found these hollow MELF components. Can anyone identify what they are? They measure as capacitors but I initially suspected they might be bead inductors. Please see attached photos. Note that the circuit also includes multilayer ceramic capacitors.
They didn't appear hollow when soldered on the PCB because solder filled in the ends. However once they were desoldered I noticed some hollow ends. Inside one end of the component there is what appears to be a "plug" blocking the hole (I forced one out by pushing a lead through the open end). The 'plug' is round and flat like a short flat cylinder (like a hockey puck). I'm not sure of the purpose. Since these are hollow (except for the plug) I initially suspected they might be bead inductors. However my LCR measurements don't confirm that (not confident about UNI-T readings):
2.612 nF, 0.L ohms, -- mH / measured with DER EE DE-5004 LCR
2.65 nF, 0.L ohms, 6.87 mH / measued with UNI-T UT603 LCR
The tuner PCB is labeled SMEWN870A and the can had the label UTUNNTUAL025 / TEDH9-300A / 1227CT3A. I couldn't find a schematic or datasheet.
(last image is courtesy of electronicrepairguide.com)