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#1
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Schematic required NTP Phasing scope
Hi Guys,
Anyone got the schematic for a NTP 277-500 phasing scope (Goniometer) as fitted to SSL desks etc? The people who now own NTP are very helpful but say they didn't receive documentation for this product when they took over the company!! Anyone gotta circuit? Would save me a shedload of time. Also looking for a new tube (AEG Telefunken D7-16 GJ) when I get it fixed. It is for a restoration job I'm working on at the moment. Pip pip -- Chris Notton Replace "nospam" with my surname to reply by email Sostituisca il "nospam" con il mio cognome per rispondere }////(* |
#2
Posted to rec.audio.pro
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Schematic required NTP Phasing scope
Chris Notton wrote:
Hi Guys, Anyone got the schematic for a NTP 277-500 phasing scope (Goniometer) as fitted to SSL desks etc? The people who now own NTP are very helpful but say they didn't receive documentation for this product when they took over the company!! Anyone gotta circuit? Would save me a shedload of time. I don't, but I can guess it. What is the thing doing? Also looking for a new tube (AEG Telefunken D7-16 GJ) when I get it fixed. It is for a restoration job I'm working on at the moment. Try Sphere Research in Canada, www.sphere.bc.ca. They have a good stock on old scope tubes. You can probably also get Hawkeye Picture Tubes to rebuild the old tube for you, and it might be cheaper. The GJ means it has a short persistance phosphor. You may want to consider replacing it with the GM long persistence phosphor. The tube may be easier to find, and personally I tend to like the long persistence on a phase meter. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
Posted to rec.audio.pro
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Schematic required NTP Phasing scope
Chris Notton wrote:
Well the PSU dies after a variable amount of time, there is a voltage multiplication circuit that I think is collapsing. I thought that getting a circuit diagram for such a common accessory would be easy but no go. Is the multiplier open to air, or is it all sealed up in epoxy? Does it smell funny? You got the choice of a diode going open when it gets hot or a ceramic cap that is cracked and goes open when it gets hot. If you have a meter with an HV probe, it can help a lot. But my tendency would be to just shotgun all the caps and diodes in the multiplier out. You can get a roll of 1N4007s for a couple pennies each. Do get the HV probe and make sure there's still something coming off the transformer.... the multiplier parts in general are much more likely to fail open than shorted so if you actually measure low voltage coming off the transformer, it's probably time to look earlier in the circuit. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
In article , says...
Chris Notton wrote: Hi Guys, Anyone got the schematic for a NTP 277-500 phasing scope (Goniometer) as fitted to SSL desks etc? The people who now own NTP are very helpful but say they didn't receive documentation for this product when they took over the company!! Anyone gotta circuit? Would save me a shedload of time. I don't, but I can guess it. What is the thing doing? Also looking for a new tube (AEG Telefunken D7-16 GJ) when I get it fixed. It is for a restoration job I'm working on at the moment. Try Sphere Research in Canada, www.sphere.bc.ca. They have a good stock on old scope tubes. You can probably also get Hawkeye Picture Tubes to rebuild the old tube for you, and it might be cheaper. The GJ means it has a short persistance phosphor. You may want to consider replacing it with the GM long persistence phosphor. The tube may be easier to find, and personally I tend to like the long persistence on a phase meter. --scott Hey All, I eventually obtained a manual, set-up info & diagrams of the NTP phasing scope & have successfully repaired it! The owner has given me permission to offer the information to any other owners who need it, so if you have got one....... The problem was the CMOS "chopper" circuit that was used to generate the h.t. voltages. Oh yes, & the intensity control was not doing anything! Tricky little buggers these, took flippin ages! Still can't find a new tube though so if anyone comes across a AEG Telefunken D7-16 GJ or GM (thanks Scott) please drop me an email Pip pip -- Chris Notton Replace "nospam" with my surname to reply by email Sostituisca il "nospam" con il mio cognome per rispondere }////(* |
#6
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Quote:
I really would need the schema for the NTP 277-500. I have a broken one, which needs to be fixed. |
#7
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
On Saturday, 28 March 2009 02:15:19 UTC+2, Chris Notton wrote:
In article says... Chris Notton Hi Guys, Anyone got the schematic for a NTP 277-500 phasing scope (Goniometer) as fitted to SSL desks etc? The people who now own NTP are very helpful but say they didn't receive documentation for this product when they took over the company!! Anyone gotta circuit? Would save me a shedload of time. I don't, but I can guess it. What is the thing doing? Also looking for a new tube (AEG Telefunken D7-16 GJ) when I get it fixed. It is for a restoration job I'm working on at the moment. Try Sphere Research in Canada, www.sphere.bc.ca. They have a good stock on old scope tubes. You can probably also get Hawkeye Picture Tubes to rebuild the old tube for you, and it might be cheaper. The GJ means it has a short persistance phosphor. You may want to consider replacing it with the GM long persistence phosphor. The tube may be easier to find, and personally I tend to like the long persistence on a phase meter. --scott Hey All, I eventually obtained a manual, set-up info & diagrams of the NTP phasing scope & have successfully repaired it! The owner has given me permission to offer the information to any other owners who need it, so if you have got one....... The problem was the CMOS "chopper" circuit that was used to generate the h.t. voltages. Oh yes, & the intensity control was not doing anything! Tricky little buggers these, took flippin ages! Still can't find a new tube though so if anyone comes across a AEG Telefunken D7-16 GJ or GM (thanks Scott) please drop me an email Pip pip -- Chris Notton Replace "nospam" with my surname to reply by email Sostituisca il "nospam" con il mio cognome per rispondere }////(* Hi Chris, We are servicing an SSL console and the NTP 277-500 was serviced by a previous technician. This scope was not working thereafter. We need the schematics to be able to repair the unit. Would you be able to send me the above mentioned? Brett |
#8
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
Still can't find a new tube though so if anyone comes across a AEG Telefunken D7-16 GJ or GM (thanks Scott) please drop me an email you might try the amateur radio "boatanchors" forums. Mark |
#9
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
In article ,
wrote: On Saturday, 28 March 2009 02:15:19 UTC+2, Chris Notton wrote: In article says... Chris Notton Hi Guys, Anyone got the schematic for a NTP 277-500 phasing scope (Goniometer) as fitted to SSL desks etc? The people who now own NTP are very helpful but say they didn't receive documentation for this product when they took over the company!! Anyone gotta circuit? Would save me a shedload of time. I don't, but I can guess it. What is the thing doing? Also looking for a new tube (AEG Telefunken D7-16 GJ) when I get it fixed. It is for a restoration job I'm working on at the moment. Try Sphere Research in Canada, www.sphere.bc.ca. They have a good stock on old scope tubes. You can probably also get Hawkeye Picture Tubes to rebuild the old tube for you, and it might be cheaper. The GJ means it has a short persistance phosphor. You may want to consider replacing it with the GM long persistence phosphor. The tube may be easier to find, and personally I tend to like the long persistence on a phase meter. --scott Hey All, I eventually obtained a manual, set-up info & diagrams of the NTP phasing scope & have successfully repaired it! The owner has given me permission to offer the information to any other owners who need it, so if you have got one....... The problem was the CMOS "chopper" circuit that was used to generate the h.t. voltages. Oh yes, & the intensity control was not doing anything! Tricky little buggers these, took flippin ages! Still can't find a new tube though so if anyone comes across a AEG Telefunken D7-16 GJ or GM (thanks Scott) please drop me an email Pip pip -- Chris Notton Replace "nospam" with my surname to reply by email Sostituisca il "nospam" con il mio cognome per rispondere }////(* Hi Chris, We are servicing an SSL console and the NTP 277-500 was serviced by a previous technician. This scope was not working thereafter. We need the schematics to be able to repair the unit. Would you be able to send me the above mentioned? Brett Chris Notton is now working for Keylight, the Otari guys in the UK. You can reach him at chris at mtr90.com, I believe. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#10
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
On Wednesday, 18 March 2015 15:30:20 UTC+2, Scott Dorsey wrote:
In article , wrote: On Saturday, 28 March 2009 02:15:19 UTC+2, Chris Notton wrote: In article says... Chris Notton Hi Guys, Anyone got the schematic for a NTP 277-500 phasing scope (Goniometer) as fitted to SSL desks etc? The people who now own NTP are very helpful but say they didn't receive documentation for this product when they took over the company!! Anyone gotta circuit? Would save me a shedload of time. I don't, but I can guess it. What is the thing doing? Also looking for a new tube (AEG Telefunken D7-16 GJ) when I get it fixed. It is for a restoration job I'm working on at the moment. Try Sphere Research in Canada, www.sphere.bc.ca. They have a good stock on old scope tubes. You can probably also get Hawkeye Picture Tubes to rebuild the old tube for you, and it might be cheaper. The GJ means it has a short persistance phosphor. You may want to consider replacing it with the GM long persistence phosphor. The tube may be easier to find, and personally I tend to like the long persistence on a phase meter. --scott Hey All, I eventually obtained a manual, set-up info & diagrams of the NTP phasing scope & have successfully repaired it! The owner has given me permission to offer the information to any other owners who need it, so if you have got one....... The problem was the CMOS "chopper" circuit that was used to generate the h.t. voltages. Oh yes, & the intensity control was not doing anything! Tricky little buggers these, took flippin ages! Still can't find a new tube though so if anyone comes across a AEG Telefunken D7-16 GJ or GM (thanks Scott) please drop me an email Pip pip -- Chris Notton Replace "nospam" with my surname to reply by email Sostituisca il "nospam" con il mio cognome per rispondere }////(* Hi Chris, We are servicing an SSL console and the NTP 277-500 was serviced by a previous technician. This scope was not working thereafter. We need the schematics to be able to repair the unit. Would you be able to send me the above mentioned? Brett Chris Notton is now working for Keylight, the Otari guys in the UK. You can reach him at chris at mtr90.com, I believe. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Thank you Scott. I appreicate the info. Regards Brett |
#11
Posted to rec.audio.pro
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Schematic required NTP Phasing scope
I purchased NTP 277-500 on ebay, now I managed to connect it but intensity is very bad. If turn intensity knob fully clockwise I can see some light green signal, but it can be seen only in dark. Do anyone have any idea what is wrong? Thanks.
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#12
Posted to rec.audio.pro
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Schematic required NTP Phasing scope
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#13
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
Has anybody got the schematic for the NTP 277-500 ?
I have access to the original Telefunken tubes. |
#14
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
In article ,
wrote: Has anybody got the schematic for the NTP 277-500 ? I have access to the original Telefunken tubes. This thread is nearly a decade old now. Chris Notton doesn't hang out here any longer, but he's the guy with the original problem and he did eventually come up with the schematic of the thing. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#15
Posted to rec.audio.pro
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Schematic obtained NTP Phasing scope
On Monday, 5 December 2016 14:22:31 UTC, Scott Dorsey wrote:
In article , wrote: Has anybody got the schematic for the NTP 277-500 ? I have access to the original Telefunken tubes. This thread is nearly a decade old now. Chris Notton doesn't hang out here any longer, but he's the guy with the original problem and he did eventually come up with the schematic of the thing. --scott "C'est un Nagra. C'est suisse, et tres, tres precis." Hey Scott, I sold the last tube a while ago but I still have the diagrams if anybody needs them. contact me on www.otari.co.uk Regards to all. |
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