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The ultimate DIY? A Stax SRM-T2!


spritzer
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In the usa, 220/240v is balanced with optional neutral and mandatory ground.

Air Conditioners,electric dryers, ovens and electronic cooktops are wired this way.

I forgot that in the UK the equivalent is actually 480v which is no longer delivered

to residential areas.

I have a couple of old time pieces of British equipment that require 480v.

I don't like to mess with them, as we have to use booster transformers.

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In the usa, 220/240v is balanced with optional neutral and mandatory ground.

Air Conditioners,electric dryers, ovens and electronic cooktops are wired this way.

I forgot that in the UK the equivalent is actually 480v which is no longer delivered

to residential areas.

I have a couple of old time pieces of British equipment that require 480v.

I don't like to mess with them, as we have to use booster transformers.

The raw feed in the road here is actually three phase (ie each phase being 120 degrees from the other two) plus neutral. Every third property is connected to the same phase, so approximately balancing the phase currents over many properties. The voltage between any two live phases is 415V (240 x root 3). So the 240V that comes into each property is fundamentally unbalanced.

And yeah - if you have a piece of gear that uses three phase, or even wierder two out of three phases, there is nothing much you can do except use a transformer.

Craig

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So here are the measured powers

amplifier

500 volt line 45ma 22 watts

250 volt line 45ma 11 watts

-260 volt line 42ma 10 watts

-500 volt line 45ma 22 watts

-560 volt line 80 ma 5 watts

6 amps @ 6.3 vac output tubes 37 watts

1.8 amps @ 6.3 vac input tubes 11 watts

about 120 watts of PURE class A HEAT.

42 of which go into the heatsinks.

power supply

500 volt supply about 9 watts

-500 volt supply about 9 watts

250 volt supply about 5 watts

-260 volt supply about 5 watts

-560 volt supply about 3 watts

So about 31 watts into the heatsinks

plus the loss in the transformers.

So something like 165 watts total power draw.

+/-15 volt power supplys less than 1 watt total.

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Updated schematic with all the voltages

http://gilmore.chem.northwestern.edu/t2schem.pdf

updated bom with all the screws. THIS TIME FOR SURE...

(i was missing the screws for the feet)

http://gilmore.chem.northwestern.edu/t2parts3.xls

Ordered the lexan for the amplifier bottom, and power supply top...

Got to show it off for CJ. :D

I was thinking of glass, but lexan is going to be easier.

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Ordered the lexan for the amplifier bottom, and power supply top...

Got to show it off for CJ. :D

Not that you wouldn't think of this Kevin but are you guys able to get some additional power to the rig rooms in Chicago? There were some issues with this in LA in the high-end room in particular and with you drawing a steady 1.25A+ and tossing out that much heat you might need your own room for thermal and power reasons. :)

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For billys thing last fall, we got to see the circut breaker panel and what was in just that

one room. A total of 5 seperate circuits, each with 20 amps. That was just the half

of that particular room, the other half had the same thing. Plus there were plugs in

the floor that were supplied by an unknown additional panel.

Now the heat is a different problem. People should wear shorts and tank-tops.

Well maybe not :D (tyll or me in shorts and a tank top... shudder shudder)

Anyone have any male stax plugs?? Want to make a he90 adapter, someone might

bring them.

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Well not quite. The liquid nitrogen is just used to pre-cool the beam line and during helium filling to cool the helium to 80K. The nitrogen liquefiers (8-off) each provide 600kW of cooling power.

The real bitch is the helium liquefiers. Each of the eight plants provides 18kW of cooling power at 4.5K, for which they require 4MW of electrical power. So the helium system consumes 32MW of electrical power - that produces 16,000 litres of liquid helium *per hour*.

The LHC helium system doubles the world capacity in helium liquefaction.

All this is necessary since the "cold mass" of LHC, which is at 1.8K, is nearly 40,000 tons.

Thanks for clarifying.

They have reached the first 7 TeV collision!

cern_LHC_Denis_Balibouse_Reuters.jpg

I wish I could go to CJ2010!

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Just have to say that this is one impressive amp. What is even more impressive though is the speed with which this progressed. Trully a top-notch amp and a fun project to watch develop. Thanks.

There will be plenty of room in the high-end room, even for this behemoth. I will have to put a no shorts rule in effect in that room since both Kevin and Tyll will likely be spending a bunch of time in there. :D

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I can't believe i got it done in 8 months.

In fact i can't even believe i got it done.

And no magic smoke or parts flying across the room.

And i only got bit by the high voltage once, because

i was working when i was way too tired.

Never ever am i going to do something this massive again.

Estimate of at least 500 hours in this.

Well the hollowed out brick is going to be a one off....

although the boards will be available...

I see the beginnings of smoke rising from california :D

Need to find some 64 position balanced shallco's.

NO shorts, NO socks, NO underwear... Lets go Native.

Edited by kevin gilmore
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I can't believe i got it done in 8 months.

In fact i can't even believe i got it done.

And no magic smoke or parts flying across the room.

And i only got bit by the high voltage once, because

i was working when i was way too tired.

Epic project is the only way to describe it. Perhaps we should have that engraved on the front panels...

Need to find some 64 position balanced shallco's.

Series or shunt? ;D

NO shorts, NO socks, NO underwear... Lets go Native.

Ehhhh.... m'key...

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Hrm.. so haven't checked in a bit.. is there any new stuff available to throw money at ? Chassis bits? If not that's okay haha tax return isn't in yet.

The impressions sound awesome and yeah Kevin you deserve all the praise and respect out there for realizing this in 8 months. It's almost unbelievable if it was anybody except for you. Sorry but this trumps a titanium hammer as cool as one of those is ;p

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