They didn't replace them because their main threat, USSR was gone and Russia stoped patroling the areas were the ohios patrol. They were safe no matter what.
They are the quietest SSBNs they can manage at the moment and that is the problem at hand for Russia and their work on developing systems... ie new sonar sets for even their smallest ships, and also the C4IR network they have developed is now paying off.
The next gen US SSBN is going to have serious problems because the Russians are seriously raising the bar...
Feel almost sorry for the US taxpayer, because they are going to break records in terms of cost with the new replacement models...
They are 40-20 years old. That's huge. Even Russia replaces its SSBN with something new and they are from the same period as Ohio. After spending so much time in water the sub doesn't act like when it was brand new specially in terms of stealth. Just like f-22 lose their stealth when spending some time outside.
They get overhauls and upgrades to keep them useful... look at the B-52... do you think a guy from the 1950s could get in and operate that aircraft now?
This particular Ohio has been upgraded and changed to allow it to carry cruise missiles instead... it is supposed to approach enemy territory to launch its missiles... which will have a range of 2,000km or less so trying to get targets deep inside Russia means getting as close as possible... which sounds like a good reason to upgrade the silencing on board the boats... at the very least new external tiles...
Grigorovitch carries the latest sonars produced by Russia. Put the two in a small part of the mediteranean and grigirovitch will track it farely better than a new build Borei or Virginia class.
All their new boats and upgraded boats will be getting those sonars and the processing electronics behind them... that is the new reality for the US Navy to deal with.
USSR had krivak frigate to track them. Grigorovitch is the modern krivak with latest tech. If krivak could threat them, then it should be an easy job for Grigorovitch.
Rubbish. The Krivak was a frigate... a border patrol ship... basically a big well equipped corvette... the ships the USSR developed to hunt SSBNs were Moskvas and Kievs and Udaloys and SSNs of all types.
They are working on a new SSBN because Russia (and China) are getting more and more assets that can track them. And looking how Virginia are made it won't be better:
Well looking at the Ford class carriers, the Zumwalt class destroyers, and the LCA littoral frigates... I would say the only people that are going to be happy are the people making enormous amounts of money... as long as they don't have to front up to congress to explain why what they delivered is shit and late and twice the agreed price...
I also note that one of the priority areas is the creation of non-nuclear submarines with an air-independent power plant and the further serial construction of diesel-electric submarines"...
Well they are much cheaper, and easier to export to allies... and the list of those they might sell stuff to is expanding all the time... does Turkey have a company that makes AIPs? Perhaps Russia and Turkey could market Ladas with Turkish AIPs and other bits and pieces according to the clients wishes...