19-10-2018, 09:35 AM
I have three Tek 24xx series scope.
The 2465B (400MHz) which is my everyday scope. Bought secondhand some years ago, probably about 10 years ago for about £800. This replaced...
An original 2465 (300MHz) which I bought secondhand for £2000 c1989. This was a superb investment for my then new business and was in daily use until I got the 2465B. It incresingly suffered from annoying intermittents that cause the Ch1 trace to jitter up and down. Never managed to track down the problem which was the main reason for getting the 2465B when it was offered at a good price.
A 2445A with Opt 05 (TV) whose origin I'm not sure of. It has calibration RAM failure but otherwise works fine. I've never really used it.
I've just "borrowed" the U400 from my 2465 and it has solved the problem. Changing it is dead easy. Undo 4 nuts, lift the old part off, reverse the process to install new part. Not sure about correct tightness for the nuts so I used common sense and also did them up in sequence as you would a car cylinder head.
The best deal I saw on a U400 is this one: https://www.ebay.co.uk/itm/TESTED-WORKING-Tektronix-Channel-Switch-U400-155-0236-00-2400-Oscilloscope-IC-2/282767530666?epid=1810061189&hash=item41d6421aaa:g:rDwAAOSwxixaLXW7:rk:2:pf:0
I'm not actually registered on ebay but if I decide to get it then I'll need to register. Also need to factor in VAT and customs handling but it's a business expense so I get the VAT back. The worry with importing a part is if it turns out to be faulty.
The 2465B (400MHz) which is my everyday scope. Bought secondhand some years ago, probably about 10 years ago for about £800. This replaced...
An original 2465 (300MHz) which I bought secondhand for £2000 c1989. This was a superb investment for my then new business and was in daily use until I got the 2465B. It incresingly suffered from annoying intermittents that cause the Ch1 trace to jitter up and down. Never managed to track down the problem which was the main reason for getting the 2465B when it was offered at a good price.
A 2445A with Opt 05 (TV) whose origin I'm not sure of. It has calibration RAM failure but otherwise works fine. I've never really used it.
I've just "borrowed" the U400 from my 2465 and it has solved the problem. Changing it is dead easy. Undo 4 nuts, lift the old part off, reverse the process to install new part. Not sure about correct tightness for the nuts so I used common sense and also did them up in sequence as you would a car cylinder head.
The best deal I saw on a U400 is this one: https://www.ebay.co.uk/itm/TESTED-WORKING-Tektronix-Channel-Switch-U400-155-0236-00-2400-Oscilloscope-IC-2/282767530666?epid=1810061189&hash=item41d6421aaa:g:rDwAAOSwxixaLXW7:rk:2:pf:0
I'm not actually registered on ebay but if I decide to get it then I'll need to register. Also need to factor in VAT and customs handling but it's a business expense so I get the VAT back. The worry with importing a part is if it turns out to be faulty.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
