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7L14 - no 1st LO output

Christopher Hilton-Johnson All Messages By This Member #87446 开云体育 Hi Guys Information please. I have a 7L14, where the 1st LO has just died. It seems the main YIG driver transistor, an NPN Darlington, has already been replaced The Tek part number is 151-0454-00, but this bears a Motorola number SJ6796 and a date code of 8018. ? Despite searching all the usual places (net/databooks)?I cannot find any reference to the Motorola part. Anyone got any information about it they are willing to share? thanks Chris HJ
David DiGiacomo All Messages By This Member #87447 On Mon, Feb 11, 2013 at 9:44 AM, Christopher Hilton-Johnson <chj@...> wrote: Hi Guys Information please. I have a 7L14, where the 1st LO has just died. It seems the main YIG driver transistor, an NPN Darlington, has already been replaced The Tek part number is 151-0454-00, but this bears a Motorola number SJ6796 and a date code of 8018. Despite searching all the usual places (net/databooks) I cannot find any reference to the Motorola part. Anyone got any information about it they are willing to share? thanks Chris HJ You could buy a replacement Tek part:
raymonddompfrank #87448 Hi Chris, My very difficult to read copy of the "Semiconductors Common Design Parts Catalog 1982 identifies this (bottom of page 6-20) as a DTS1010, High(er) voltage NPN in TO-3 case. Specs are here: Could this be correct? Raymond toggle quoted message Show quoted text --- In TekScopes@..., "Christopher Hilton-Johnson" wrote: Hi Guys Information please. I have a 7L14, where the 1st LO has just died. It seems the main YIG driver transistor, an NPN Darlington, has already been replaced The Tek part number is 151-0454-00, but this bears a Motorola number SJ6796 and a date code of 8018. Despite searching all the usual places (net/databooks) I cannot find any reference to the Motorola part. Anyone got any information about it they are willing to share? thanks Chris HJ
Christopher Hilton-Johnson All Messages By This Member #87450 开云体育 ? ?>?You could buy a replacement Tek part: Got some already?- but thanks for the tip! Really more about trying to find information about what appears to be an installed?replacement ? Chris HJ
Christopher Hilton-Johnson All Messages By This Member #87451 开云体育 >My very difficult to read copy of the "Semiconductors Common Design Parts Catalog 1982 identifies this (bottom of page 6-20) as a DTS1010, High(er) voltage NPN in TO-3 case. Specs are here: > >Could this be correct? >Raymond Raymond Absolutely correct - the original is a DTS1010, but again, thanks for the pointer to the datasheet for that part. My interest is in trying to get information about the part actually installed as the YIG main coil driver in my (failed) 7L14. I just want to know if it is supposed to be better/different/was a factory installed replacement etc. during the 7L14 lifetime (according to my Manual) this board (YIG driver) went theough three iterations (suffix -01 through -03) yet mine is a suffix -00, confusing or what? Really my interest is in trying to get some data on this Motorola part, to add perspective to this issue, but?I have a correct replacement, which I will use & see what happens! ? Chris HJ ?
raymonddompfrank #87452 Chris, Your question was clear, both David DG and I didn't read it well. This is one ref. to a Freescale (-Motorola) part with just a few specs: Here you can see that the mil-designated Freescale part is considered at least in some way compatible with Tek's part and DST1010 (and some others). I guess you've seen it already. toggle quoted message Show quoted text --- In TekScopes@..., "Christopher Hilton-Johnson" wrote: Hi Guys Information please. I have a 7L14, where the 1st LO has just died. It seems the main YIG driver transistor, an NPN Darlington, has already been replaced The Tek part number is 151-0454-00, but this bears a Motorola number SJ6796 and a date code of 8018. Despite searching all the usual places (net/databooks) I cannot find any reference to the Motorola part. Anyone got any information about it they are willing to share? thanks Chris HJ
Christopher Hilton-Johnson All Messages By This Member #87454 开云体育 Raymond The good news is that replacing the Motorola part with the Tek specified item produces a cure & all is good again. ?Probably not relevant but the Motorola part was aluminium, and featherweight, the original part is steel and of substance.?I think the problem was junction heat related, in that there was a direct relationship between length of 'off' time, in days, and 'on' time in minutes, with a minimum of 1 day 'off' to get any 'on' time at all. ? Thanks for all responses regards Chris HJ ?
raymonddompfrank #87455 AFAIK, the specific heat capacity of aluminium is much larger than that of steel, but this seems somewhat extreme... Glad your issue is resolved. Raymond toggle quoted message Show quoted text --- In TekScopes@..., "Christopher Hilton-Johnson" wrote: Raymond The good news is that replacing the Motorola part with the Tek specified item produces a cure & all is good again. Probably not relevant but the Motorola part was aluminium, and featherweight, the original part is steel and of substance. I think the problem was junction heat related, in that there was a direct relationship between length of 'off' time, in days, and 'on' time in minutes, with a minimum of 1 day 'off' to get any 'on' time at all. Thanks for all responses regards Chris HJ
David DiGiacomo All Messages By This Member #87463 On Mon, Feb 11, 2013 at 1:00 PM, Christopher Hilton-Johnson <chj@...> wrote: Raymond The good news is that replacing the Motorola part with the Tek specified item produces a cure & all is good again. Probably not relevant but the Motorola part was aluminium, and featherweight, the original part is steel and of substance. I think the problem was junction heat related, in that there was a direct relationship between length of 'off' time, in days, and 'on' time in minutes, with a minimum of 1 day 'off' to get any 'on' time at all. I don't think there's a significant thermal performance difference between steel and aluminum TO3s.

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