The TR7A was an early 80's transceiver that had some subtle differences to a TR7. Not that many were made and it is a bit of a collectors item. Practically, it isn't all that much different to a TR7 except in the following areas:

• Came with noise blanker
• Came with SSB, CW and AM filter
• Came with DR7
• Mic audio appears on back panel
• TR7A displayed on front panel.
• Some RX front end protection