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I opened the case (again ), and noticed at the A1 PCB part number - 671-0720-08 -a 2445B PCB, not a 2465B PCB.
I queried the seller, and this is what he claims:
"Tek made 2445B and 2465B with only one internal difference: a 2445B has a bandwidth choke on the backside of its main A1 board etched into the printed circuitry of the bare board. This was also true of the 2445A 2465A pair, and the original 2445 2465 pair introduced in 1983.
For the privilege of not having that bandpass limiter, Tek charged clients $2000 more, but was too lazy to make 2 really different scopes.
So since 1985, when I discovered Tek's laziness, I have earned my living upgrading the 3rd digit from 4 to 6.
The clock stays with the A5 board. The 2445B A1 board, once it has its bandwidth choke bypassed (I cut traces in 4 places on the back and spliced in 2 short straight wires to carry the signals from the DL100 delay line to the inputs of U600), can do 400MHz.
The only other difference is to ground a contact (pin 23 J511) that tells the A5 processor board that it is now has a 6 instead of a 4 (as 3rd digit) that allows the 5nS/cm fastest sweep speed to be accessible, instead of just going upto 10nS/cm.
This is what many of my 2465B clients have, but so far you are the only one to have noticed... "
I looked at the circuits, and discovered a 3rd difference - the 2465B PCB has inductor L403, apparently for adjusting the HF circuit.
Leaving aside the apparent legal ramifications of what he has been doing for 25 years, without disclosing to his customers, I would like to learn from the technical people here:
1. If there are any other technical differences between the 2445B and 2465B A1 PCB's?
2. If the integrity of the A1 PCB has been compromised by cutting the PCB traces?
3. If there is any spurious interference of any kind caused by the new spliced wires?
4. If this modified 2445B A1 PCB is, in fact, functionally equivalent to a real 671-0722-08 2465B A1 PCB (disregarding Tek's marketing considerations), and if not, why not?
Looking forward to many responses!
ALSO, one of my 2445's has a modification in it and I can't find where it came from. Are there Service Bulletins, Tech Bulletins, etc. that I can go to to find modifications or upgrades or improvements? Where are they located if so?
thanks guys, I'm new to this forum and couldn't figure out how to post an original so I tagged on to this one.
I know where there are 4 or 5 2465B's for about $500 with a 30 day warranty. The business is 5 miles away.
Repairable ones usually go for $125 but are not returnable. The business has a test bench so you can check
things out before purchase.
Was the seller:
Alexander Schonfeld, dba OSCILLOSCOPES, ETC. in Antioch California. Ebay id "2465b"
Is this the same complaint that says he would give you a refund after you gave back East Jerusalem?
He said this because you are in Israel? What a jerk.
I don't think they can do much after all this time but at least you can get this
guy identified as a crook. If he does not respond to the BBB then they log that too.
Is this the ebay seller id "2465b" ?
I remember somebody mentioning to me about somebody who was doing this
board swap business on ebay a few years ago. So your efforts have helped
others to watch out and you probably helped others to avoid this rip-off guy.
If you want to know where I get this Tektronix gear I can let you know.
They sell stuff on ebay but also have a walk-in store.
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