For servicing EMT's in the US I would contact Dusch directly, he will be of assistance http://www.emt-profi.de/welcome.htm
But in reality look at these PDF's http://www.hans-fabritius.de/en/emt.html at the bottom of the page and it gives the service to be performed.
In reality the EMTs are simple and the schematics are readily available. Best is service by Dusch but then things can be done by competant technicians.
In regards to the 930 vs the 927 I would say that they are in different ballgames, I auduitioned the 927 vs the 930 very briefly in Italy and that was enough to hear a significant difference (both had the 139st). The 930 has less weight, presence an PRAT.
The 930 is without doubt good so long as you get it with the 139st not the 155st. Therefore care must be taken on getting one that has the correct PS. Voltages for the tube phonos are not the same as the later SS phono stages. Van Vliet in Netherlands does make a PS for the 139 phono ic case you do not have one, no idea if it is good.
Even if Thuchan and I disagree (we also agree on many things) my view is that any EMT should be considered as a "plug and play" with its phonostage, Thuchan is using the TT part of his R80.
I have done a/b between the 927 direct to Kondo phono stage and ANJ amps etc....horns....vs the 927 and its 139st (mine is original fully serviced by Dusch and kitted with following serial numbered Telefunkens), well it is quite amazing to see (hear!) how this technology from >50years ago performs.
I also have the SX8000 with FR66s and FR7 cartridge, the a/b SX8000 FR66S:FR7 into Kondo phono vs 927 with 139 is on the agenda in the next weeks.
I lived with my 927 for sometime then switched back to the SX8000, missed the 927. Now back on the 927 I do not miss the SX8000 what doe that tell me?
All fun!
But in reality look at these PDF's http://www.hans-fabritius.de/en/emt.html at the bottom of the page and it gives the service to be performed.
In reality the EMTs are simple and the schematics are readily available. Best is service by Dusch but then things can be done by competant technicians.
In regards to the 930 vs the 927 I would say that they are in different ballgames, I auduitioned the 927 vs the 930 very briefly in Italy and that was enough to hear a significant difference (both had the 139st). The 930 has less weight, presence an PRAT.
The 930 is without doubt good so long as you get it with the 139st not the 155st. Therefore care must be taken on getting one that has the correct PS. Voltages for the tube phonos are not the same as the later SS phono stages. Van Vliet in Netherlands does make a PS for the 139 phono ic case you do not have one, no idea if it is good.
Even if Thuchan and I disagree (we also agree on many things) my view is that any EMT should be considered as a "plug and play" with its phonostage, Thuchan is using the TT part of his R80.
I have done a/b between the 927 direct to Kondo phono stage and ANJ amps etc....horns....vs the 927 and its 139st (mine is original fully serviced by Dusch and kitted with following serial numbered Telefunkens), well it is quite amazing to see (hear!) how this technology from >50years ago performs.
I also have the SX8000 with FR66s and FR7 cartridge, the a/b SX8000 FR66S:FR7 into Kondo phono vs 927 with 139 is on the agenda in the next weeks.
I lived with my 927 for sometime then switched back to the SX8000, missed the 927. Now back on the 927 I do not miss the SX8000 what doe that tell me?
All fun!