Used amplifiers

Time to split up the special’s page into two so one for headphones and another one for electronics.  Here I’ll list what my more unusual amplifier projects, used amplifiers that I’ve refurbished/rebuilt plus any other piece I’m selling.  Feel free to contact me at spritzer@mjolnir-audio.com if you are interested in any item here.  I will reply to every mail so if you haven’t received a reply within 24 hours then feel free to send me another email.  Email gets lost all the time or is flagged as spam.  All prices in US dollars (USD).

 

Ahhh the Stax SRM-T8000. I bought this one as the first used unit to hit the market anywhere as I just had to try the new flagship amp. I got it from Japan but we quickly figured out how change to any voltage so it is now set to 240V. This is serial number 26 so early first batch for people who care about that. It is mint in every way and while Kevin Gilmore and I have both opened it up to see what the circuit contains, it is still perfect. The screws were not in the top as Stax screws always get scratched with use so they were kept secure until the amp ships out.  It comes with everything a new amp would come with except the wait time…  😉

Price: 4300$ plus shipping

Finally one of these is ready after a lot of delays, a fully rebuilt and modified SRM-T1S. I found a nice example in Japan of this iconic amp and had it shipped here. I then replaced all the capacitors in the amp, modified the bias supplies to be up the latest standard and finally, installed constant current sources for the tubes. The main issue of the T1 and all the later variants (T1S, T1W, 006t, 006tA) is how the tubes are being driven. They have resistor current sources so a large part of the potential power is wasted in those resistors, making the amps sound a bit bland. What I did was remove all those resistors and fit a large heatsink in their place with the same current source as used in the BHSE and KGST fixed to it. The difference in performance is rather dramatic, the amp suddenly feels alive and something actually happens when you increase the volume. Now I can’t change the fact that the tubes used in these aren’t ideal but this at least makes sure the potential in there isn’t wasted as heat in the resistors.

The actual amp is a late model T1S and bonus points for being the same color as the SR-Omega.  🙂  It is in good over all condition with just some small paint marks on the back of the cover. The tubes are GE which were in the amp when I got it but they test like new. The amp has an internal voltage selector so I can set it to what ever voltage before shipping it out.

Price: 1300$ plus shipping

This is a one off Dynalo like the other ones I’m selling but only in a project box. This case came with some laser etched markings so I just used it as a test bed for this Dynalo design. This actual amp has the brand new matched input fets which many of the future amps will use. Only other difference is the lack of markings and just one input, no loop output. Can be set to either 117V or 230V.

Price: 450$ plus shipping

This one has been sitting around for a while, a SRD-7 Mk2 Pro bias transformer box. It can drive both normal and Pro bias headphones at the same time using pretty much any stereo amplifier. The amplifier is connected via the gray umbilical and I installed banana plugs on it to make connecting it to amps easier. It works on 100-240VAC and has a US/Japanese plug but I can supply an adapter for use in Europe.

Price: 370$ plus shipping

Last updated 19.08.18

Top