Oneida LS-206A/U rack mount speaker was the original the matching military set for the Collins R-390A receiver. This dual speaker was a component part of the AN/GRC-26 Mobile RTTY Communications Hut. The receiving portion of the GRC-26 had two R-390 receivers that were rack mounted with a CV-116 Diversity RTTY Converter and the LS-206. The dual speakers allowed the operator to monitor the signal while tuning in each receiver. Once the RTTY signal was tuned in on each receiver the speakers could be turned off.
I purchase this on eBay in 2018 and fully restored & upgraded it. I stripped and repainted the faceplate with the original Battleship Gray color. I rewired it and made a new gasket. I also replaced the two speakers with modern day Alnico equivalent but kept the original transformers. Today, I use this as the primary speakers for my Collins R-390A and Hammarlund SP-600 radios.
I purchase this on eBay in 2018 and fully restored & upgraded it. I stripped and repainted the faceplate with the original Battleship Gray color. I rewired it and made a new gasket. I also replaced the two speakers with modern day Alnico equivalent but kept the original transformers. Today, I use this as the primary speakers for my Collins R-390A and Hammarlund SP-600 radios.