This Rose RV23 preamp dates from the 90s. As standard, it already sounds good and it came to me a few years’ ago for some upgrades to the power supply, and improved coupling capacitors. With those mods it sounds really special!
This time it was in for a new volume pot, and selector switch, along with a couple of new phono sockets as the originals were very loose. A TKD pot was chosen along with a quality Elna selector switch and teflon /gold plated phono sockets. I always enjoy listening to this pre which you’d have to spend several thousand pounds to beat! No circuit digram is available and no one is even sure whether the valves should all be ECC82s or a mix of 82s and 83s…..it works with both!
This preamp dates from the early 90s when it had a reputation for great sound quality. It stands the passage of time well and still sounds very decent. It had had various mods and servicing over the years, including main electrolytic capacitors, valve sockets etc.Someone had also replaced the ribbon connector with some Cat cabling.It is a hybrid valve /solid state design, with transistors used for the phono stage and valves for the line stage.
My work was to upgrade the coupling capacitors, and add a choke power supply by adding a choke and additional smoothing capacitor. Once this work was complete it transpired the original main smoothing capacitor was pretty spent, so that was replaced too.That took a while to find as it broke down after around 2 hours use, but was fine up until then.
The result was very worthwhile, performance has been lifted to a very pleasing level. The pre operates with a much quieter background, displays subtleties better and is more dynamic to boot.