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Station X · 11th Nov 2012, 9:50 pm

MY R1556A also has the white panel, so I assume it was part of the conversion from an AR88. It also has the connection for "Contol Unit 88" which I've never been able to find any information on. I assumed it was some kind of muting unit.

11th Nov 2012, 9:50 pm	#13
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: R1556A High imp. phones MY R1556A also has the white panel, so I assume it was part of the conversion from an AR88. It also has the connection for "Contol Unit 88" which I've never been able to find any information on. I assumed it was some kind of muting unit. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.