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Tek 2235 HV Multiplier
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Kevin John Chadwick
Hi All,
Two questions: Anyone heard from Deane Kidd recently? Is he still answering e-mails (vacation?). I am looking for an HV multiplier for a really good 2235. If I cannot locate one at a reasonable price I would like to build one using discrete diodes and capacitors (12 kV for HV and -2kv for focus). Anyone know what is inside the original multiplier circuits? - or has a scrap 22xx complete with multiplier for sale? I have checked the archives but can find very little on the 2235 multipliers just lots about 547s. Trying to remove the potting from the failed unit seems to be just about impossible. The existing HV multiplier still works but loads down the power supply and prevents the -8.6 v from getting past -8.3 before the current limiter kicks in. Presumably the existing multiplier is leaky when the high voltage is generated. Thanks for any information. Kevin C Ottawa ON |
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arthurok
i received an enail from deane last night.
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are you sure the tripler is actually defective? the tripler in the 2235 and similar scopes is quite small so an nte528 tv tripler cant be easily fit in as in the case of a 465/475 and other scopes. sometimes sphere in canada has them, there is a firm in greece who has them from time to time too ----- Original Message -----
From: Kevin John Chadwick To: TekScopes@... Sent: Monday, February 05, 2007 6:17 PM Subject: [TekScopes] Tek 2235 HV Multiplier Hi All, Two questions: Anyone heard from Deane Kidd recently? Is he still answering e-mails (vacation?). I am looking for an HV multiplier for a really good 2235. If I cannot locate one at a reasonable price I would like to build one using discrete diodes and capacitors (12 kV for HV and -2kv for focus). Anyone know what is inside the original multiplier circuits? - or has a scrap 22xx complete with multiplier for sale? I have checked the archives but can find very little on the 2235 multipliers just lots about 547s. Trying to remove the potting from the failed unit seems to be just about impossible. The existing HV multiplier still works but loads down the power supply and prevents the -8.6 v from getting past -8.3 before the current limiter kicks in. Presumably the existing multiplier is leaky when the high voltage is generated. Thanks for any information. Kevin C Ottawa ON |
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Deane E. Kidd
Hi from Deane:
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Yes, I am still alive and well and still rather sarcastic as follows. You want the HV multiplier from the 2235 scope but you don't include the Tek part number. Yes, I can go find the manual and then the schematic and thefile number and then the part number, but you have the part in your hand. All of us that have parts for Tek items use the same part numbers and it sure makes it easier to help. I have about one hundred multipliers and I know that I don't have the 465M multiplier but I don't know the number for the 2235. Deane ----- Original Message -----
From: Kevin John Chadwick To: TekScopes@... Sent: Monday, February 05, 2007 4:17 PM Subject: [TekScopes] Tek 2235 HV Multiplier Hi All, Two questions: Anyone heard from Deane Kidd recently? Is he still answering e-mails (vacation?). I am looking for an HV multiplier for a really good 2235. If I cannot locate one at a reasonable price I would like to build one using discrete diodes and capacitors (12 kV for HV and -2kv for focus). Anyone know what is inside the original multiplier circuits? - or has a scrap 22xx complete with multiplier for sale? I have checked the archives but can find very little on the 2235 multipliers just lots about 547s. Trying to remove the potting from the failed unit seems to be just about impossible. The existing HV multiplier still works but loads down the power supply and prevents the -8.6 v from getting past -8.3 before the current limiter kicks in. Presumably the existing multiplier is leaky when the high voltage is generated. Thanks for any information. Kevin C Ottawa ON -- I am using the free version of SPAMfighter for private users. It has removed 876 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: |
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Greg_A
Has to be at least a tripler with 6kV diodes and 10nF caps/10kV each. For a
tripler - 3 diodes and 3 capacitors... Greg At 12:17 AM 2/6/07 +0000, Kevin John Chadwick wrote:
Emacs! |
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georgeplhak
I may need one of these also.
The Tek pn is 152-0806-00 Mfr is Unitrode Corp. Watertown, MA Their pn CMX647 It is described in the TEK circuit description as: "High voltage mutiplier U975 utilizes the 2-kV winding of T948 to generate 12 kV (so it is 6X) to drive the crt anode. It also uses an internal half wave recifier diode to produce -2 kV for the crt cathode." George Plhak, Acton, Ontario, Canada --- In TekScopes@..., "Deane E. Kidd" <dektyr@...> wrote: follows. You want the HV multiplier from the 2235 scope but you don't include the Tek part number. Yes, I can go find the manual and then the schematic and thefile number and then the part number, but you have the part in your hand. All of us that have parts for Tek items use the same part numbers and it sure makes it easier to help. I have about one hundred multipliers and I know that I don't have the 465M multiplier but I don't know the number for the 2235. Deane |
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georgeplhak
TEK obviously had a second source for these.
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The actual U975 in my 2235 (that may need one) is labeled: "152-0806-00 MSL8513 MURATA 8544" The 8544 is probably the date code. A quick search of MURATA and UNITRODE websites doesn't get any hits on either the TEK pn or the mfr pn. Sphere doesn't seem to have any. George Plhak, Acton, Ontario, Canada --- In TekScopes@..., "georgeplhak" <ffwd@...> wrote:
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