Originally supplied in 1997 it was enhanced with a large external dual-mono power supply in 2004.
Following a number of amendments, and a period of time in storage, it has been thoroughly repaired and serviced. A couple of damaged chokes have been replace, some of the psu capacitors replaced, a new pair of 6072A input and 5687WB driver valves, and a new set of EH Gold Grid 300Bs are now being used instead of the TJ mesh plate 300B/n valves shown.
The PSU contains a large mains transformer for each channel, plus valve rectifiers, choke input and first psu cap for the input/driver psu. The psu is remotely switched on/off from the main chassis.
Inside the main chassis there are two mains transformers for the 300B filament supplies, and six more chokes for the various power supplies.
In total there are three valve rectified, choke input filtered power supplies per channel, making six in total. One for the 300Bs, the second for the input/driver stage, and the third for the negative bias supply.
The components inside are typical of the period, including Elna Cerafine HT caps for the 300B ht, a lot of Black Gates, Hovland coupling caps, Mills and Rhopoint wirewound and even a couple of tantalum film resistors.
The servicing should see it good for many years to come.
I am impressed! Andreas
ReplyDeleteIt's good that Simon still services and upgrades these great bits of kit.
ReplyDeleteI'm new on here but just to add that I bought a tranny coupled arcadia off Colin in 2016 who he bought from Simon in 2014 which had been serviced and upgraded to specs available at that time. Just wondered if Simon remembers this one as I was told it was one of a kind being transformer coupled and not cap coupled as normal.
Yes, I do remember that transformer coupled Model 1 preamplifier, but then it is unique amongst the SJS Model 1 line stages, all the others are RC coupled!
DeleteIt was originally supplied back in early '97 and it is good to hear it is still going strong.