Re: Wanted : plug-in 100x attenuator module [part number: 307-1014-10] to restore a Tek 475

donald collie
 

No, it`s a 307-1014-01 [I misread the part number on the one in the other
channel`s attenuator assembly]. I wondered why the CH2 was producing
nothing on 4 positions - the 100x attenuator is missing completely.
A good thing Tek socketed their transistors in the 475, i`ve found
two defective so far. I find the easiest way to service the 475 is to
remove each transistor and test . What goes wrong with a 42 year old 475? :
leaky DC restorer diodes, and failed sweep generator transistors [Q904, and
Q922]
When I was working for Broadcasting in the 70`s we had a 465, an R&S
POLYSCOP 1, and an AVO model8 Mk 5 multimeter, and that was all we had to
maintain 3 transmitting sites with 20kW television and Radio transmitters
and auxiliary equipment. Seat of your pants stuff! Now I have, in my own
test bay, a 475, an R&S POLYSCOP 2, and an AVO model8 Mk5, amongst other
equipment. Funny how all comes to he who waits. Thankyou for responding - I
have already asked Susan at Sphere Research to put one aside for me- so
i`ll obtain one there. [...and some of the correct transistors:-)
..............................................................................................................73`s
de Don ZL4GX


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On Sat, Jan 13, 2018 at 7:56 PM, Dave Casey <polara413@...> wrote:

I have both 307-1014-00 and 307-1014-01 to offer; brand new, never used.
But I do not have the -10.
The -00 and -01 are both 100x. The -10 is either just a later version or
perhaps designed to terminate differently? The 7D15 and 7A15A use the -00
and later the -01. The 7A18A uses the -01.
Haven't checked the 475 manual to see if earlier serials used the earlier
version or not.

Dave Casey

On Sat, Jan 13, 2018 at 12:26 AM, Harvey White <madyn@...>
wrote:

On Thu, 11 Jan 2018 19:24:58 -0800, you wrote:

Does anybody have a parts mule thet can scavenge so I can complete this
`scope [or advise where I can get this 100x attenuator module]

All I have is a 307-1014-01. Not sure that it would be the same.

Harvey



Thankyou...................................................
...............................................Donald Collie ZL4GX






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