Doepfer

ahhh, I always wondered why I had a rack with different style power 
supply than the others.....now I know.


John.



--- In Doepfer_a100@yahoogroups.com, Bakis Sirros 
<synth_freak_2000@y...> wrote:
> DIETER SAY:
> The description of the customer tells me that the
> system was 
> manufactured in
> 1997 or earlier. Until end of 1997 we used a combined
> power inlet/EMC
> filter/fuse holder and a separate power switch instead
> of the 
> combination of
> power inlet/fuse holder/power switch used for all
> systems manufactured 
> in 1998
> or later. After the EMC compatibility test in the EMC
> lab to obtain the 
> CE sign
> (EMC compatibility) it was recognized that the
> expensive EMC filter is 
> not
> necessary. So we changed to the new mains inlet
> without EMC filter end 
> of 1997.
> The two version can be distinguished very easily: If
> there is a 
> separate power
> switch (not integrated to the mains inlet) it is the
> old version with 
> EMC filter
> (manufactured until about end of 1997, maybe even
> still some systems or 
> frames
> were sold early in 1998). If the power switch is
> integrated to the 
> mains
> inlet/fuse holder it is the new version manufactured
> 1998 or later.
> 
> Obviously the EMC filter (probably the electrolyt of
> one of the the 
> high voltage
> capacitors inside the EMC filter) has become defective
> and has to be 
> replaced.
> It is available as a spare part from us or the
> representative/dealer 
> where the
> customer purchased the device. It would also be
> possible to use the new 
> mains
> inlet but in this case the complete rear panel has to
> be replaced as 
> the holes
> for the main inlets are different for both versions.
> 
> Of course we test each power supply before we ship it
> but for each 
> electronic
> part it may happen  that it becomes defective after 6
> years (or even 
> more) in
> use.
> 
> BTW we think about a second type of A-100 power supply
> that uses 
> so-called
> ring-core transformers. Roland Mayer has built a
> prototype of this 
> power supply
> last week and we are about to do some experiments with
> the new power 
> supply. It
> seems to be more quiet and even generates a smaller
> electromagnetic 
> field (e.g.
> important in combination with the spring reverb).
> Maybe there will be 
> two types
> of A-100 power supplies available in the future:
> standard version and 
> "high-end"
> version with ring-core transformers. But as these new
> transformers are 
> very
> expensive and have to be hard-wired and mounted by
> hand to the pc board 
> the
> price for the "high end" power supply resp. a 6HU
> frame/system will 
> increase by
> about 20~25 Euro. I will keep you informed as soon as
> we decide to 
> offer a
> second type of power supply. If we do so the "high
> end" power supply 
> will have
> the same dimensions as the old one so that each
> standard power supply 
> could be
> replaced very easily by the new one if desired. But if
> the standard 
> power supply
> works perfect for the user there is no need to change
> to the "high end" 
> type.
> The modules will not sound better :-)
> 
> Dieter
> 
> 
> 
> 
> =====
> synthfreak(parallel worlds)
> athens-greece
> [Doepfer_a100] group owner-moderator
> 
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