Could someone tell me if this DS1225Y Nvram-150 can be used? I want to be with everything at hand at the time of exchange of the same.
Quick question while I await the arrival of a 2465B, which I bought for €53/$60 (my first Tek scope - yay), that is supposedly defective. The seller stated that it arced in either the tube or the HV-supply but was otherwise in perfect working condition and in calibration until that day. I know that it is kinda hard to speculate on without more information, and he did mention that a new tube might be needed which seems plausible, but any ideas what might be the source of this arcing?
The seller stated that it arced in either the tube or the HV-supply but was otherwise in perfect working condition and in calibration until that day. I know that it is kinda hard to speculate on without more information, and he did mention that a new tube might be needed which seems plausible, but any ideas what might be the source of this arcing?
The seller stated that it arced in either the tube or the HV-supply but was otherwise in perfect working condition and in calibration until that day. I know that it is kinda hard to speculate on without more information, and he did mention that a new tube might be needed which seems plausible, but any ideas what might be the source of this arcing?
The AC line safety capacitors may have failed which is a common and easily repairable problem.
The seller stated that it arced in either the tube or the HV-supply but was otherwise in perfect working condition and in calibration until that day. I know that it is kinda hard to speculate on without more information, and he did mention that a new tube might be needed which seems plausible, but any ideas what might be the source of this arcing?
The AC line safety capacitors may have failed which is a common and easily repairable problem.
Yes, but some of those capacitors are "hidden"; in the last week I've "done" a 2465 and 2445B, and while the "hidden" caps hadn't failed, they were crazed. FFI, see http://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf
And don't forget the infamous control board caps, q.v.
The HV supply arcing may simply be neons flashing.
The seller stated that it arced in either the tube or the HV-supply but was otherwise in perfect working condition and in calibration until that day. I know that it is kinda hard to speculate on without more information, and he did mention that a new tube might be needed which seems plausible, but any ideas what might be the source of this arcing?
The AC line safety capacitors may have failed which is a common and easily repairable problem.
Yes, but some of those capacitors are "hidden"; in the last week I've "done" a 2465 and 2445B, and while the "hidden" caps hadn't failed, they were crazed. FFI, see http://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf
And don't forget the infamous control board caps, q.v.
The HV supply arcing may simply be neons flashing.
Those paper capacitors all seem to be universally bad having either physically degraded do to age like you describe or shorted out. I think they have been changed in my 2445B but I have a few junked 22xx main boards where they are crazed and I do not bother pulling them for spares.
The reason I suggested them is that they do not always go out with a bang and their arcing may have been mistaken for a high voltage problem while not disabling the oscilloscope. They are just something else to check.
I do not know of any reason they cannot be replaced with modern film or ceramic safety capacitors and of course they can always be derated.
The chances of the CRT being the source of the HV issue is rather remote, unless it's been subject to damage or shock. The best way to find the source of the arcing is to remove the case, darkened room, and look for the source. But keep your hands behind your back.
The AC line safety capacitors may have failed which is a common and easily repairable problem.
The HV supply arcing may simply be neons flashing.
The chances of the CRT being the source of the HV issue is rather remote, unless it's been subject to damage or shock. The best way to find the source of the arcing is to remove the case, darkened room, and look for the source. But keep your hands behind your back.
According to the seller he just powered it up and somehow experienced arcing, that is all I know for the moment, so I don't think it was damage or shock. A good idea I hadn't thought of with the darkened room, and good advice too.The AC line safety capacitors may have failed which is a common and easily repairable problem.
That was my first thought too but I shuck it off as wishful thinking so I am glad that you suggest this. Those will be the first I examine after having looked for anything obvious.The HV supply arcing may simply be neons flashing.
Flashing as in worn out? As far as I know the scope does not work anymore, could these cause that if they are broken and/or kill other components.
Flashing as in worn out? As far as I know the scope does not work anymore, could these cause that if they are broken and/or kill other components.
They prevent the cathode-grid voltage from becoming dangerous. Normally that only happens after the power is turned off. Some Tek scopes also have a neon in the main PSU that flashes continually, but IIRC the 2465 doesn't.
Well, there's your problem.. And, sometimes you win, sometimes you lose.
How are my chances that nothing else is damaged from this broken tube? Everything else looks totally undamaged and in excellent condition. After all, it has been turned on with the tube in this state.
Tubes from 2445, 2445A, 2445B, 2465, 2465A, 2465B,2430, 2430A, 2432, 2432A and 2440 are all suitable, right?