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Old 18th December 2003, 09:19 AM   #1
Luke is offline Luke  New Zealand
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Default Aleph 2 photo shoot.

This is the coolest amp (or anything) that I have ever made.
Im really pleased with the result of my metal work and the electronics.

Transformers are from Harbuch in Australia. They are 1KVA 35 0 35.
Power supply caps are all surplus. There are 2 x 35 V 100000 in series paralleled with a 70 V 68000 cap per rail total of about 120000 per rail or I like to think of it as half a farad total Its so beautiful how my lights flicker on power up, but anything less than a 10 amp fuse eventually blows.
Ive used a 3 watt 1k resistor to across the caps in series to give them equal volt drop. Bride rectifiers are surplus and so is all the metal. The front panel and lid are made of 8mm aluminum plate. The lid has 6mm allen heads bolts recessed into it. All other metal is 4 mm plate.
Cabling is also surplus, in fact al the surplus stuff is out of old mainframe power supplies.
The sinks are from Plinius, all old stock from an amp that never made production.
Boards are from Harvardin, thanks, they are real professional.
All semis are from Mouser, IRFP244 matched.
DC offset is 17mV on one and 22mV on the other. There is no turn on or turn off thump.
Heat is not too bad, they weigh about 25-30 kgs and the thick plate lid helps in the heat transfer. I can keep my hand on for a long time and it dont burn so Im picking its running in the late 50 degree mark?
Last but not least, orange LEDs. Blue is so 90s
Nelson if your out there thanks big time.
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Old 18th December 2003, 09:23 AM   #2
Luke is offline Luke  New Zealand
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more pics
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Old 18th December 2003, 09:25 AM   #3
Luke is offline Luke  New Zealand
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one more
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Old 18th December 2003, 09:26 AM   #4
Luke is offline Luke  New Zealand
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last one
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Old 18th December 2003, 09:30 AM   #5
Will is offline Will  Malaysia
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Great job mike ....

Hmmm, I assume you listen while lying on the floor huh
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Old 18th December 2003, 09:32 AM   #6
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Luke,

very nice and clean!! What bias setting?


william

P.S. if you can keep your hand on for a long time its below 50C
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Old 18th December 2003, 09:42 AM   #7
Luke is offline Luke  New Zealand
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Hi Will,

Speaker stands are high on priority list, I usually use a chair under speakers for listening which annoys my wife.

Wuufwaff,

Bias is default 3 amps I think?
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Old 19th December 2003, 01:47 AM   #8
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Beautiful case! The clean line of screws on the top plate looks great.
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Old 19th December 2003, 01:54 AM   #9
Guss is offline Guss  Canada
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AWESOME !!! What's the total cost for one unit?
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Old 19th December 2003, 01:56 AM   #10
Philo is offline Philo  United States
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Nice looking amps Luke. You didn't say how they sound in your post!?! Let us know! I even like the cute hat your wife put on the left speaker!
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