This Collins 30S-1, Control  Relay  K-203,  P/N 970 1937 00, is a BRAND NEW Drop in Replacement Relay.

 This Relay is part of a recent production run and was made by the same company that made the original relays for the Collins 30S-1 Amplifier, so they are a perfect and exact replacement.

They have the same mounting bracket and can be installed without drilling new mounting holes, making installation much easier. 

They have been sold out for some time and I have a few left that I am offering for less than the last price they sold for.  

 Please be advised I have only a few left in stock.

 This relay is starting to fail in many 30S-1 Amplifiers so it would be prudent to have one on hand while they are available.