RFI filters. Sealed metal cans with capacitors inside which have probably gotten leaky so they are often discarded. 

See pdf page 159
Figures 5-47 and 5-48

https://www.navy-radio.com/manuals/tty/jh/ttyman7/TeletypeManuals/model28/1169B-Chg8.pdf

Nick England K4NYW
Chapel Hill NC
www.navy-radio.com


On Wed, Oct 15, 2025 at 7:16 PM John Doe <jdoe10449@gmail.com> wrote:
Hello all,

I'm in the process of adding sound deadener to the M28 cabinet that I'm restoring and I was wondering what accessory or mod goes above the "SIGNAL" / "POWER" stamps in the attached photos.  Cabinet is a LAAC 236 GA.

I'd like to keep the holes accessible to my future self or future owner if they wish to install the part that goes there.

Thanks in advance,

Nicholas Gromak
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