Amp Internals 2 |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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yes they're a bit complicated
PS the one in the pic already has 6 boards removed Edited by kedwardsleisure - 17 April 2020 at 4:50pm |
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Kevin
North Staffordshire |
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Sonic the hedge
Registered User Joined: 12 May 2020 Status: Offline Points: 161 |
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Hill Audio DX3000
Edited by Sonic the hedge - 13 May 2020 at 1:25pm |
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Andylaser
Registered User Joined: 16 April 2010 Location: Southampton Status: Offline Points: 300 |
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Blimey. More TO-3s than my big argon laser had.
Edited by Andylaser - 13 May 2020 at 5:05pm |
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"music so loud, that if we move in next door to you; your lawn will die" - Lemmy
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madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
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I seem to remember they were quite good amplifiers, lots of power but very heavy.
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Sonic the hedge
Registered User Joined: 12 May 2020 Status: Offline Points: 161 |
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36KG, on the plus side no one is going to run off with your amp rack Bit of a marmite amp, like most Hill kit they have a few gremlins and run hot enough to fry eggs but in the right hands a very solid performer. Good for solid tight bass in bridge mode, bipolar outputs with no shunt resistors so the damping factor is ~2000 which is exceptional for an amp that does 3KW RMS (Compare to the much revered Crest 8001 from the same era which has DF ~400 @ 2.8KW!) Also straight class A/B (no rail switching) with sliding bias which means they are very linear and have virtually no detectable crossover distortion. It's a giant hi-fi amp really - bit fragile but sounds great! Edited by Sonic the hedge - 14 May 2020 at 2:56am |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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Mr. Hill definitely had some unique features in his amps. Like the transformer coupling to the driver stage in the LC series. |
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Earplugs Are For Wimps!
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Sonic the hedge
Registered User Joined: 12 May 2020 Status: Offline Points: 161 |
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DX series are transformer coupled too, as are the Chameleon series that came later. A lot of people seem to be critical of Hill kit, the reliability is sometimes questionable but when you consider that the basic design concept for the DX series was done in the early 1970s, compared to what else was available at the time the amps were pretty ground breaking. Apparently a common problem for amps of that era was cascade failure, where a minor component failure in the driver stage would put DC into the output devices and blow the whole output stage. The transformer coupling blocks DC and also provides differential drive for the output devices. It's quite a simple elegant solution. DX700 came out in 1978 and the DX3000 in around 1984 - Live Aid at Wembley in 1985 was 100% powered by DX 3000 so it must have been before then!
Edited by Sonic the hedge - 14 May 2020 at 12:52pm |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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Ok - I wasn´t sure as the transformers aren´t obvious in the photo above. Some friends of mine have a couple of the LC1200's - which I have had to service a couple of times - but still going strong. Can´t argue with that! |
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Earplugs Are For Wimps!
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Sonic the hedge
Registered User Joined: 12 May 2020 Status: Offline Points: 161 |
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Ah - that's because the transformers are under the output transistors, accessable from underneath I think they are all great amps, two of the biggest rigs I have operated were Hill powered, DX and LC series, both rigs not mine but talking 15-30Kw RMS. Both made a crazy amount of noise even considering the power but excellent sound quality too, particularly on bass.
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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Yup - nice amps. I doubt whether too many of the modern Class D, etc.
will make it into the next decade or two, like the stuff that was made
back then. I have loads of old Crest - and an old Harrison P900 Mosfet that I
still use. Recently "modernised" the Harrison by adding some speakons! |
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Earplugs Are For Wimps!
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Good old Harrisons. Friend of mine has one special model which I cannot find any information, model is X1600. It weights about 40kg. It has two stacked toroidal transformers and 32 mosfets / channel. Rail voltage is +/- 60Volts so I think it has full bridge circuit for each channel. 2x450W/8ohms, 2x800W/4ohm or 1600W/8ohm mono. Anyone familiar with this model? Edited by Tonskulus - 14 May 2020 at 5:39pm |
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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Yes, I have one X1600. Also a Harrison Xi2000. Out of interest, why do you call it special? Good old Harrisons. Friend of mine has one special model which I cannot find any information, model is X1600. It weights about 40kg. It has two stacked toroidal transformers and 32 mosfets / channel. Rail voltage is +/- 60Volts so I think it has full bridge circuit for each channel. 2x450W/8ohms, 2x800W/4ohm or 1600W/8ohm mono. Anyone familiar with this model? |
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