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Whats the most useful item you've salvaged?

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Fabio

Wed Mar 25 2009, 11:03PM

Registered Member #122 Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148

Hi All!

Fabio simulposted, so I just saw his 2.5kW tube amp. Awesome! Can I come over and play bass through it? :D

Yes of course, but i haven't a subwoofer bigger enough to withstand this enormous power and you should provide it (no matter for impedance, the output transformer have many taps and can be rewired for matching all typical speaker's impedances)

I think the enormous Partridge lump in the first picture is the output transformer, not the power supply. It's probably separate because the rack would crumble under the weight!

Yes, this is the audio output transformer!

Is so big because this amplifier is not designed for audio purposes (25-30.000 Hz) but for shacking test machines instead and can be used down to 5 Hz..... WHOOOAAAAAaaaaaaaaa..... EXTRABASS!!!!!

a passive filter inside the amplifier will cut down all frequencies over than 10 kHz, but of course this filter can be removed to raise the upper limit. (the shacker was designed for 5-200 Hz range)

Oh, also I see it has six KT88s in it too, but they're just driver tubes.

There are eight KT88 driver tubes and there are made by GEC !!!!!
The two output tubes are TY6-5000A and are made by Mullard.

i also have the original schematics and the original manuals; the shacker MUST be mounted over a special designed foundations (a giant concrete block of at least 5 tons weight,suspended with springs and shock absorber!) to avoid the possibility of localized earthquakes!!!!!
Definitely, this is a BIG (and absolutely useless!) gadget!

Ciao!
Fabio.

Proud Mary

Thu Mar 26 2009, 02:56AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Fabio wrote ...

The two output tubes are TY6-5000A and are made by Mullard.

The point of my own ridiculous post, precisely. Mille grazie, Fabio!

TY6-5000A has a 12.6V 33A thoriated tungsten filament, so a pair of them will gobble up 66A of heater current all on their own, without your KT88s and all the rest.

Fabio

Thu Mar 26 2009, 09:20AM

Registered Member #122 Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148

power up this if you can!

Proud Mary

Thu Mar 26 2009, 09:48AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Steve Conner

Thu Mar 26 2009, 11:27AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

We should take it round to this guy's house and hook it up to his concrete bass horn.

If his calculations are correct, it should give 150dB SPL to below 10Hz.

Fabio

Thu Mar 26 2009, 01:24PM

Registered Member #122 Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148

We should take it round to this guy's house and hook it up to his concrete bass horn.

If his calculations are correct, it should give 150dB SPL to below 10Hz.

Probably you didn't realize that this enormous subwoofer (the biggest in the world) is located in Busto Arsizio - Italy, at about 30 minutes by car from here (and maybe a few more minutes by truck); do you wanna try to convince his owner to borrow it for a test?

Proud Mary

Thu Mar 26 2009, 02:27PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

A bit off topic Fabio, but it would be very interesting to use it for VLF transmission experiments.

See the truly splendid Italian experimenters' site.

Radio Waves Below 22kHz

Some of the most original and talented experimenters in Europe belong to this Italian group - a shame we don't have more of their inspiration and industry here.

Wolfram

Thu Mar 26 2009, 02:35PM

Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971

Very nice amplifier, Fabio. What are your plans with it?

Anders M.

Anon01

Thu Mar 26 2009, 02:59PM

Registered Member #1589 Joined: Sun Jul 13 2008, 06:40PM
Location:
Posts: 70

7kW class D amplifier from Atomic. 80+ fets I had to replace to get it to work again. Not really salvaged but magnificent deal. I bought it broken for $200, cost about $200 in fets to fix up. Good thing only the output fets fried when the driver died, I replaced that with the good old UCC setup. driving a NPN PNP bridge driving the gates of the output fets, I think it lowered the distortion down a bit, still want to have it metered in that area. I call it a salvage. $200 in the heatsink alone I bet.

I have a 10kW(25kw+ <1minute) setup if you would want to come down here and test that. :)

Steve Conner

Thu Mar 26 2009, 03:17PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Nice find Anon01, can you post some pictures of it so we can compare with Fabio's tube behemoth?
(edit) Oh, I see it's a car amp, *divides power rating by marketing guy's shoe size*

Fabio: Let's do it, it would probably wipe the town of Busto Arsizio off the map :D

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