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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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BBC 4 prog tonight (UK)
"Play it Loud: The Story of the Marshall Amp"
22:00-23:00 probably not very technical - but includes interview with founder. |
#2
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BBC 4 prog tonight (UK)
"Geo" wrote in message ... "Play it Loud: The Story of the Marshall Amp" 22:00-23:00 probably not very technical - but includes interview with founder. You forgot to mention the two Pink Floyd programmes before and after it at 21.00 and 23.00. Gareth. |
#3
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BBC 4 prog tonight (UK)
Though I don't think Pink Floyd ever used Marshalls. It was all Hi-Watts with a load of pedals and Leslie cabinets. Gareth. |
#4
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BBC 4 prog tonight (UK)
Gareth Magennis wrote: Though I don't think Pink Floyd ever used Marshalls. It was all Hi-Watts with a load of pedals and Leslie cabinets. ** Plus a lot of WEM amplifier and cabinets. This classic pic from the back cover of "Ummagumma" shows Floyd's equipment. http://rarerecordcollector.cfhdesign...w-1-2-back.jpg There's a Revox A77, a Binson Echorec drum echo and two Hi-Watts hiding behind band members. I also see 3 Sennheiser MD409s at the front. They even carried a few spare 12-inch speakers. .... Phil |
#5
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BBC 4 prog tonight (UK)
"Phil Allison" wrote in message ... Gareth Magennis wrote: Though I don't think Pink Floyd ever used Marshalls. It was all Hi-Watts with a load of pedals and Leslie cabinets. ** Plus a lot of WEM amplifier and cabinets. This classic pic from the back cover of "Ummagumma" shows Floyd's equipment. http://rarerecordcollector.cfhdesign...w-1-2-back.jpg There's a Revox A77, a Binson Echorec drum echo and two Hi-Watts hiding behind band members. I also see 3 Sennheiser MD409s at the front. They even carried a few spare 12-inch speakers. .... Phil I stopped listening to the Floyd after "The Wall". Great album, but that was enough of Roger Waters' whining for me. Still think David Gilmour is one of the greatest guitarists ever to walk the planet. I think its the understatement he gets so right. Gareth. |
#6
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BBC 4 prog tonight (UK)
Still think David Gilmour is one of the greatest guitarists ever to walk the planet. I think its the understatement he gets so right. Agreed. I have also always loved Mark Knopfler's work Arfa Gareth. |
#7
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BBC 4 prog tonight (UK)
Gareth Magennis wrote:
** Plus a lot of WEM amplifier and cabinets. This classic pic from the back cover of "Ummagumma" shows Floyd's equipment. http://rarerecordcollector.cfhdesign...w-1-2-back.jpg There's a Revox A77, a Binson Echorec drum echo and two Hi-Watts hiding behind band members. I also see 3 Sennheiser MD409s at the front. They even carried a few spare 12-inch speakers. I stopped listening to the Floyd after "The Wall". Great album, but that was enough of Roger Waters' whining for me. ** Saw them play live in Sydney, back in August 1971 at Randwick Race Course, mid afternoon. Not the best venue or time. The Revox A77 opened the set, reels spinning fast, with a stereo recording of a DC3 starting up, taxying and then taking off across the stage from right to left at realistic volume. The band immediately broke into "One of these Days" from their not yet released "Meddle" album. Here is a short clip from that concert: http://www.youtube.com/watch?v=1mYnfk4EbkE ..... Phil |
#8
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BBC 4 prog tonight (UK)
On 28/11/2014 18:10, Geo wrote:
"Play it Loud: The Story of the Marshall Amp" 22:00-23:00 probably not very technical - but includes interview with founder. There was another unusual doc in that Fri spot a couple of months back. The life story of one Rupert Neve mixing console , was it in Sound City studios in the states, somewhere famous anyway. |
#9
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BBC 4 prog tonight (UK)
"N_Cook" wrote in message ... On 28/11/2014 18:10, Geo wrote: "Play it Loud: The Story of the Marshall Amp" 22:00-23:00 probably not very technical - but includes interview with founder. There was another unusual doc in that Fri spot a couple of months back. The life story of one Rupert Neve mixing console , was it in Sound City studios in the states, somewhere famous anyway. You can still buy bits of Neve desk, I had one of these for repair last week: http://www.studiocare.com/ams-neve-1...FczMtAodFFwA0w AMS Neve also make an 8 module rack. Check the price of that one! http://vintageking.com/neve-ams-7u-1...el-rack-loaded Gareth. |
#10
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BBC 4 prog tonight (UK)
"Phil Allison" wrote in message ... Gareth Magennis wrote: ** Plus a lot of WEM amplifier and cabinets. This classic pic from the back cover of "Ummagumma" shows Floyd's equipment. http://rarerecordcollector.cfhdesign...w-1-2-back.jpg There's a Revox A77, a Binson Echorec drum echo and two Hi-Watts hiding behind band members. I also see 3 Sennheiser MD409s at the front. They even carried a few spare 12-inch speakers. I stopped listening to the Floyd after "The Wall". Great album, but that was enough of Roger Waters' whining for me. ** Saw them play live in Sydney, back in August 1971 at Randwick Race Course, mid afternoon. Not the best venue or time. The Revox A77 opened the set, reels spinning fast, with a stereo recording of a DC3 starting up, taxying and then taking off across the stage from right to left at realistic volume. The band immediately broke into "One of these Days" from their not yet released "Meddle" album. Here is a short clip from that concert: http://www.youtube.com/watch?v=1mYnfk4EbkE ..... Phil Just listened to Meddle for the first time in decades. My God, that is an album and a half. I'd forgotten the intense pleasure "Echoes" used to bring me. Was that really made 43 years ago? Blimey. https://www.youtube.com/watch?v=6BOj1puXBzk Gareth. |
#11
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BBC 4 prog tonight (UK)
1 passing mention of soft valve distortion v SS hard distortion. No
mention of sweet spot. The documentary film of the Neve console was Sound City (2013) |
#12
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BBC 4 prog tonight (UK)
"N_Cook" wrote in message ... 1 passing mention of soft valve distortion v SS hard distortion. No mention of sweet spot. The documentary film of the Neve console was Sound City (2013) I saw that some time ago on BBCi. It was Dave Grohl out of Nirvana and Foo Fighters that bought the desk for his own studio. Must be nice to afford such a thing. One interesting thing about these large Neve desks, is that they create so much heat you also need a large Aircon system installed in the studio to run 24/7, as that is what the desk is also required to do. (You never turn these things off) The annual running costs are phenomenal. Gareth. |
#13
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BBC 4 prog tonight (UK)
"Gareth Magennis" wrote in message ... "N_Cook" wrote in message ... 1 passing mention of soft valve distortion v SS hard distortion. No mention of sweet spot. The documentary film of the Neve console was Sound City (2013) I saw that some time ago on BBCi. It was Dave Grohl out of Nirvana and Foo Fighters that bought the desk for his own studio. Must be nice to afford such a thing. One interesting thing about these large Neve desks, is that they create so much heat you also need a large Aircon system installed in the studio to run 24/7, as that is what the desk is also required to do. (You never turn these things off) The annual running costs are phenomenal. For example, the AMS Neve 1081 rack I recently repaired runs mostly on a single +24v. The faulty output modules in current production use pretty much obsolete large can transistors, the main drivers requiring plug on heatsinks to cope with the Class A design. Multiply this by the amount of class A circuits in the mixer, and you have the requirements of a local substation and the bills to prove it. Gareth. |
#14
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BBC 4 prog tonight (UK)
"Phil Allison" wrote in message ... Gareth Magennis wrote: ** Plus a lot of WEM amplifier and cabinets. This classic pic from the back cover of "Ummagumma" shows Floyd's equipment. http://rarerecordcollector.cfhdesign...w-1-2-back.jpg There's a Revox A77, a Binson Echorec drum echo and two Hi-Watts hiding behind band members. I also see 3 Sennheiser MD409s at the front. They even carried a few spare 12-inch speakers. I stopped listening to the Floyd after "The Wall". Great album, but that was enough of Roger Waters' whining for me. ** Saw them play live in Sydney, back in August 1971 at Randwick Race Course, mid afternoon. Not the best venue or time. The Revox A77 opened the set, reels spinning fast, with a stereo recording of a DC3 starting up, taxying and then taking off across the stage from right to left at realistic volume. The band immediately broke into "One of these Days" from their not yet released "Meddle" album. Here is a short clip from that concert: http://www.youtube.com/watch?v=1mYnfk4EbkE .... Phil Interesting how the camera focuses almost entirely on Waters and his bass, when all the featured lead is coming from Gilmour ... Arfa |
#15
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BBC 4 prog tonight (UK)
"Gareth Magennis" wrote in message ... "Phil Allison" wrote in message ... Gareth Magennis wrote: ** Plus a lot of WEM amplifier and cabinets. This classic pic from the back cover of "Ummagumma" shows Floyd's equipment. http://rarerecordcollector.cfhdesign...w-1-2-back.jpg There's a Revox A77, a Binson Echorec drum echo and two Hi-Watts hiding behind band members. I also see 3 Sennheiser MD409s at the front. They even carried a few spare 12-inch speakers. I stopped listening to the Floyd after "The Wall". Great album, but that was enough of Roger Waters' whining for me. ** Saw them play live in Sydney, back in August 1971 at Randwick Race Course, mid afternoon. Not the best venue or time. The Revox A77 opened the set, reels spinning fast, with a stereo recording of a DC3 starting up, taxying and then taking off across the stage from right to left at realistic volume. The band immediately broke into "One of these Days" from their not yet released "Meddle" album. Here is a short clip from that concert: http://www.youtube.com/watch?v=1mYnfk4EbkE .... Phil Just listened to Meddle for the first time in decades. My God, that is an album and a half. I'd forgotten the intense pleasure "Echoes" used to bring me. Was that really made 43 years ago? Blimey. https://www.youtube.com/watch?v=6BOj1puXBzk Gareth. I listened to it for the first time in a couple of years just a week or two ago. I have it on CD these days, and on the iPad, along with Dark Side of the Moon and Wish you were here, all of which I also had on vinyl, although I only seem to be able to lay hands on the Meddle copy right now. All three, brilliant albums ... Arfa |
#16
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BBC 4 prog tonight (UK)
Arfa Daily wrote:
** Saw them play live in Sydney, back in August 1971 at Randwick Race Course, mid afternoon. Not the best venue or time. The Revox A77 opened the set, reels spinning fast, with a stereo recording of a DC3 starting up, taxying and then taking off across the stage from right to left at realistic volume. The band immediately broke into "One of these Days" from their not yet released "Meddle" album. Here is a short clip from that concert: http://www.youtube.com/watch?v=1mYnfk4EbkE Interesting how the camera focuses almost entirely on Waters and his bass, when all the featured lead is coming from Gilmour ... ** Cameramen generally focus on what will make the best (and most saleable) images from the position they occupy at the time. Waters blood curdling screams into his Sennheiser were not to be missed for potential showing on that night's TV news. One of my clearest memories is of Gilmour siting cross legged on stage (next to the left hand speaker stack) with his Fender on his lap - playing the strings with a steel slide in his right hand while constantly adjusting his Binson Echorec with the other to get all the sound effects needed "Saucerful of Secrets" and others. At the time I had no idea what was inside that little olive green box - a tape echo maybe? Never saw one here until recently when a customer walked in with a similar Binson for repair. The damn thing looked brand new, having been carefully stored since about 1970 in someone's home till they died and it went to auction. Mechanically, it is like a small (120mm dia)rim drive turntable running at about 80rpm with a thin steel band attached to the outside of the platter and surrounded by tape heads. The valve electronics is very basic and of course there is no noise reduction circuitry. The big plusses are no tape to wear out, very low W&F and the ability to produce multiple short delays with massive repetition using the feedback control. My customer eventually sold the unit to a local collector for $4000 - making himself almost $3000 profit. See pic of same model, not on my workbench. http://www.hubinet.com/images/BINSON1.JPG BTW You can pop a CD on top of the platter and it looks like it belongs. ..... Phil |
#17
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BBC 4 prog tonight (UK)
"Phil Allison" wrote in message ... Arfa Daily wrote: ** Saw them play live in Sydney, back in August 1971 at Randwick Race Course, mid afternoon. Not the best venue or time. The Revox A77 opened the set, reels spinning fast, with a stereo recording of a DC3 starting up, taxying and then taking off across the stage from right to left at realistic volume. The band immediately broke into "One of these Days" from their not yet released "Meddle" album. Here is a short clip from that concert: http://www.youtube.com/watch?v=1mYnfk4EbkE Interesting how the camera focuses almost entirely on Waters and his bass, when all the featured lead is coming from Gilmour ... ** Cameramen generally focus on what will make the best (and most saleable) images from the position they occupy at the time. Waters blood curdling screams into his Sennheiser were not to be missed for potential showing on that night's TV news. One of my clearest memories is of Gilmour siting cross legged on stage (next to the left hand speaker stack) with his Fender on his lap - playing the strings with a steel slide in his right hand while constantly adjusting his Binson Echorec with the other to get all the sound effects needed "Saucerful of Secrets" and others. At the time I had no idea what was inside that little olive green box - a tape echo maybe? Never saw one here until recently when a customer walked in with a similar Binson for repair. The damn thing looked brand new, having been carefully stored since about 1970 in someone's home till they died and it went to auction. Mechanically, it is like a small (120mm dia)rim drive turntable running at about 80rpm with a thin steel band attached to the outside of the platter and surrounded by tape heads. The valve electronics is very basic and of course there is no noise reduction circuitry. The big plusses are no tape to wear out, very low W&F and the ability to produce multiple short delays with massive repetition using the feedback control. My customer eventually sold the unit to a local collector for $4000 - making himself almost $3000 profit. See pic of same model, not on my workbench. http://www.hubinet.com/images/BINSON1.JPG BTW You can pop a CD on top of the platter and it looks like it belongs. .... Phil In all my long bench years, I've seen just one of these, I think. I'm trying hard to remember what was wrong with it. I have this feeling that it was an open circuit head, but that might be a memory of a WEM Copycat ... Arfa |
#18
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BBC 4 prog tonight (UK)
On 01/12/2014 02:27, Arfa Daily wrote:
"Phil Allison" wrote in message ... Arfa Daily wrote: ** Saw them play live in Sydney, back in August 1971 at Randwick Race Course, mid afternoon. Not the best venue or time. The Revox A77 opened the set, reels spinning fast, with a stereo recording of a DC3 starting up, taxying and then taking off across the stage from right to left at realistic volume. The band immediately broke into "One of these Days" from their not yet released "Meddle" album. Here is a short clip from that concert: http://www.youtube.com/watch?v=1mYnfk4EbkE Interesting how the camera focuses almost entirely on Waters and his bass, when all the featured lead is coming from Gilmour ... ** Cameramen generally focus on what will make the best (and most saleable) images from the position they occupy at the time. Waters blood curdling screams into his Sennheiser were not to be missed for potential showing on that night's TV news. One of my clearest memories is of Gilmour siting cross legged on stage (next to the left hand speaker stack) with his Fender on his lap - playing the strings with a steel slide in his right hand while constantly adjusting his Binson Echorec with the other to get all the sound effects needed "Saucerful of Secrets" and others. At the time I had no idea what was inside that little olive green box - a tape echo maybe? Never saw one here until recently when a customer walked in with a similar Binson for repair. The damn thing looked brand new, having been carefully stored since about 1970 in someone's home till they died and it went to auction. Mechanically, it is like a small (120mm dia)rim drive turntable running at about 80rpm with a thin steel band attached to the outside of the platter and surrounded by tape heads. The valve electronics is very basic and of course there is no noise reduction circuitry. The big plusses are no tape to wear out, very low W&F and the ability to produce multiple short delays with massive repetition using the feedback control. My customer eventually sold the unit to a local collector for $4000 - making himself almost $3000 profit. See pic of same model, not on my workbench. http://www.hubinet.com/images/BINSON1.JPG BTW You can pop a CD on top of the platter and it looks like it belongs. .... Phil In all my long bench years, I've seen just one of these, I think. I'm trying hard to remember what was wrong with it. I have this feeling that it was an open circuit head, but that might be a memory of a WEM Copycat ... Arfa The oddest one I came across was when I was making rather than repairing electronic stuff. Ended up being thrown out but these days I would have persisted. I don't think it was a prototype as the lettering on the front was silk screened and the , yes actual Nescafe coffee tin , inside and so not visible to an owner, was painted black on the outside of the tin. Inside was a leather wiper attached to a record deck cartridge or something, an oil film around the inside and a motor to spin this wiper in the tin around the curved surface. As I received it was minus the 3 or 4 valves, the motor seized and a number of missing wires. No info found about it then or now. Only about 6x9x8 inches in size |
#19
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BBC 4 prog tonight (UK)
Googling around, it was much like these
http://gretschpages.com/forum/garage...o/43619/page1/ http://www.lakeviewmedia.com/music-g...o/adineko.html same lidded tin can but 1 or 2 more valve (bases anyway) , a couple more front controls, no name on the front or anywhere |
#20
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BBC 4 prog tonight (UK)
On 30/11/2014 02:35, Phil Allison wrote:
http://www.hubinet.com/images/BINSON1.JPG What is the thing on the top on the left (directly behind the "B" of "Binson") that looks like a bottle of Loctite in a battery holder? -- Jeff |
#21
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BBC 4 prog tonight (UK)
Jeff Layman wrote:
On 30/11/2014 02:35, http://www.hubinet.com/images/BINSON1.JPG What is the thing on the top on the left (directly behind the "B" of "Binson") that looks like a bottle of Loctite in a battery holder? ** That is bottle of light oil. The steel band needs a smear of oil clean it and so the heads do not make actual contact. http://www.effectrode.com/magnetic-d...chorec-manual/ FYI the steel band is very thin and quite seamless - it appears to be shrink fited onto the alloy drum. Nice bit of machining to make that from a steel tube. Regular 1/4 inch tape heads are used with a normal HF bias oscillator for record but a permanent magnet for erase. So there is more background noise than tape recorder of the same vintage. But running at 20ips does help. .... Phil |
#22
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BBC 4 prog tonight (UK)
Phil Allison wrote:
the steel band is very thin and quite seamless - it appears to be shrink fited onto the alloy drum. Nice bit of machining to make that from a steel tube. ** Forget that. Info recently posted on the web (not there when I have me example on the bench) suggests the "band" is made from very fine wire, probably a Iron / Nickel alloy, wound onto the drum and then machined smooth. http://www.effectrode.com/magnetic-d...memory-system/ BTW: The wire cannot be "Constantan" cos like most resistance wire it is non magnetic. .... Phil |
#23
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BBC 4 prog tonight (UK)
On 02/12/2014 01:17, Phil Allison wrote:
Phil Allison wrote: the steel band is very thin and quite seamless - it appears to be shrink fited onto the alloy drum. Nice bit of machining to make that from a steel tube. ** Forget that. Info recently posted on the web (not there when I have me example on the bench) suggests the "band" is made from very fine wire, probably a Iron / Nickel alloy, wound onto the drum and then machined smooth. http://www.effectrode.com/magnetic-d...memory-system/ BTW: The wire cannot be "Constantan" cos like most resistance wire it is non magnetic. Good catch! I wonder if the original wire was, or was based on, the wire originally used in magnetic wire recorders. That was about the same diameter as a human hair, and trying to machine it must have been a hell of a challenge. Also having an iron content must have made it susceptible to corrosion. There is a quite interesting webpage here which covers the subject: http://www.smecc.org/wire_recorder_care_&_repair.htm That mentions cleaning and lubricating the wire with our old friend - WD-40! -- Jeff |
#24
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BBC 4 prog tonight (UK)
Jeff Layman wrote:
Phil Allison wrote: the steel band is very thin and quite seamless - it appears to be shrink fited onto the alloy drum. Nice bit of machining to make that from a steel tube. ** Forget that. Info recently posted on the web (not there when I have me example on the bench) suggests the "band" is made from very fine wire, probably a Iron / Nickel alloy, wound onto the drum and then machined smooth. http://www.effectrode.com/magnetic-d...memory-system/ BTW: The wire cannot be "Constantan" cos like most resistance wire it is non magnetic. Good catch! I wonder if the original wire was, or was based on, the wire originally used in magnetic wire recorders. ** That is my conclusion too. It was readily available at the time, the diameter was a tad under 0.1mm and it was made from a magnetic grade of stainless steel. AFAIK, Binson were to only maker to use this idea. ..... Phil |
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