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RES: 475 dead voltage multiplier (was: 475 high voltage circuit very

Marcus - PP5MS All Messages By This Member #71058 开云体育 Hi Reed, ? Is the NTE538 or a ECG538 ?a “X6” multiplier? Is the datasheet available? ? Marcus ? De: TekScopes@... [mailto:TekScopes@...] Em nome de Reed Dickinson Enviada em: ter?a-feira, 7 de fevereiro de 2012 18:56 Para: TekScopes@... Cc: Laura Tighe Assunto: [TekScopes] 475 dead voltage multiplier (was: 475 high voltage circuit very ? ? I have encountered at least a dozen bad HV multipliers in various 4XX series scopes. In all cases, except the 485, I have used the ECG538 or the NTE538 replacement available through Mouser for $26. It is necessary to cut the HV lead from the 538 and splice the original Tek connector on the cable. I use a thick wall plastic tube with the ID the same as the largest wire. Make the solder joint free of sharp points to avoid arcing, cover the joint with silicon RTV and slide the plastic tube over the joint. Connect the LOW lead on the 538 to ground. Do not use the D or FOCUS leads but insulate both from ground. Connect the IN terminal on the 538 to the flyback transformer. After the RTV cures mount the 538 where the original multiplier was by drilling two holes in the metal bottom and securing with two screws. It is necessary to trim the metal HV cage cover to get the cable through. Reed Dickinson
Reed Dickinson All Messages By This Member #71068 开云体育 Hi: The 4XX series of scopes, except for the 485, use a X3 multiplier.? The 485 uses an X6.? I have an old ECG catalog for a reference.? ECG was bought out by NTE.? There should be a datasheet? for the NTE538 on the internet but I have not checked this out. Reed ????????????????????????????? On 2/7/2012 1:10 PM, Marcus - PP5MS wrote: toggle quoted message Show quoted text ? Hi Reed, ? Is the NTE538 or a ECG538 ?a “X6” multiplier? Is the datasheet available? ? Marcus ? De: TekScopes@... [mailto:TekScopes@...] Em nome de Reed Dickinson Enviada em: ter?a-feira, 7 de fevereiro de 2012 18:56 Para: TekScopes@... Cc: Laura Tighe Assunto: [TekScopes] 475 dead voltage multiplier (was: 475 high voltage circuit very ? ? I have encountered at least a dozen bad HV multipliers in various 4XX series scopes. In all cases, except the 485, I have used the ECG538 or the NTE538 replacement available through Mouser for $26. It is necessary to cut the HV lead from the 538 and splice the original Tek connector on the cable. I use a thick wall plastic tube with the ID the same as the largest wire. Make the solder joint free of sharp points to avoid arcing, cover the joint with silicon RTV and slide the plastic tube over the joint. Connect the LOW lead on the 538 to ground. Do not use the D or FOCUS leads but insulate both from ground. Connect the IN terminal on the 538 to the flyback transformer. After the RTV cures mount the 538 where the original multiplier was by drilling two holes in the metal bottom and securing with two screws. It is necessary to trim the metal HV cage cover to get the cable through. Reed Dickinson
Tom Miller Member Profile All Messages By This Member #71069 开云体育 Hi Reed, ? The 465 and 475 use a X6 multiplier. See the X-ray, courtesy of a group member,?of a 475 CW multiplier in the photos. Six diodes and six capacitors clearly visible. ? Regards, Tom toggle quoted message Show quoted text ----- Original Message ----- From: Reed Dickinson To: TekScopes@... Sent: Tuesday, February 07, 2012 4:55 PM Subject: Re: RES: [TekScopes] 475 dead voltage multiplier (was: 475 high voltage circuit very ? Hi: The 4XX series of scopes, except for the 485, use a X3 multiplier.? The 485 uses an X6.? I have an old ECG catalog for a reference.? ECG was bought out by NTE.? There should be a datasheet? for the NTE538 on the internet but I have not checked this out. Reed ????????????????????????????? On 2/7/2012 1:10 PM, Marcus - PP5MS wrote: ? Hi Reed, Is the NTE538 or a ECG538 ?a “X6” multiplier? Is the datasheet available? Marcus De: TekScopes@... [mailto:TekScopes@...] Em nome de Reed Dickinson Enviada em: ter?a-feira, 7 de fevereiro de 2012 18:56 Para: TekScopes@... Cc: Laura Tighe Assunto: [TekScopes] 475 dead voltage multiplier (was: 475 high voltage circuit very ? I have encountered at least a dozen bad HV multipliers in various 4XX series scopes. In all cases, except the 485, I have used the ECG538 or the NTE538 replacement available through Mouser for $26. It is necessary to cut the HV lead from the 538 and splice the original Tek connector on the cable. I use a thick wall plastic tube with the ID the same as the largest wire. Make the solder joint free of sharp points to avoid arcing, cover the joint with silicon RTV and slide the plastic tube over the joint. Connect the LOW lead on the 538 to ground. Do not use the D or FOCUS leads but insulate both from ground. Connect the IN terminal on the 538 to the flyback transformer. After the RTV cures mount the 538 where the original multiplier was by drilling two holes in the metal bottom and securing with two screws. It is necessary to trim the metal HV cage cover to get the cable through. Reed Dickinson
KB6NAX All Messages By This Member #71091 Apparently there never has been a data sheet for the NTE538 or the precursor ECG538. The net revealed nothing but robotic responses with no data sheets. Mouser has only one left and zero on order. The NTE website reports the remaining stock: I guess I'll take a hit and buy one to see what I can do with it. Or maybe not if I'm going to build one for my 455. Arden toggle quoted message Show quoted text Is the NTE538 or a ECG538 a "X6" multiplier? Is the datasheet available?

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