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Heres the gallery showing some of the pics of the DDS-2250V
out of its case. You can click
on any of the pictures to see a bigger one. If you have a text only browser, you are in
the wrong place!!
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In its box - complete with flight case handles to make it
easier to carry 47lbs of amplifier around. No badge on the front yet though. |
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Out of the box now, back row: 2 x Trace Elliot Speed Twin
H50 output transformers, 4 x 6L6WGB and a rather tasty Parmeko mains transformer (oil
filled) - you ain't going to blow this one!!! 30VA toroidal for heater supplies and
switching in front of it, and along the front row, 5 x Mullard M8137 (12AX7WA mil spec).
Nestling in the middle is another M8137 flanked by a pair of Mullard M8162's (12AT7WA) to
stoke up the 6L6's. |
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Here's the view from round the back - not too interesting
- if you squint up really close, you might see that adjustable damping control sitting
upright in front of the output transformers... The fluorescent yellow blobs are the
effects send/return adjustment controls. |
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Underneath: Ooo err, it's a bit of a mess.
The left hand side of the picture is the preamp stage - note that it's shielded from the
engine room to cut hum and noise. At the top of this strip, is the PCB which handles
master volume and effects switching - the rest is all hand wired.
The right hand strip is the power amp and power supplies.
At the top are two10W resistors to cut HT for standby mode. The left is dominated by the
main power card and 4 x 290uF capacitors. Short circuit for instant sun tan. Down at the
bottom the MOSFET regulator, and just to the left of this, a pair of 12V supplies to feed
the heaters for the 9 pin valves and other low voltage requirements... |
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Heres the MOSFET regulator - there's a little fuse on
board in case things go wrong, and also a small home-made heatsink to keep the MOSFET
cool... |
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