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Help please with Tek 545A Oscilloscope
Help please with Tek 545A Oscilloscope
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Old 10th December 2018, 09:17 PM   #11
Jazid is offline Jazid  United Kingdom
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Okey dokey, thanks again, I'll do it tomorrow as soon as commitments permit. I'll check the tubes in channel A amp as well since B seems to behave about right using the channel A timebase. But the Y plates. Here I'm at sea,: if it's not a weak valve what should I look for?

Another question (sorry) channel B works with A timebase and channel A works with A time base, so it suggests to me that Channel A timebase is OK. If there is no dot on the screen for Channel. B when using its timebase does this suggest that the B timebase is misbehaving, the B Y plates, both, or something else?

Grateful thanks in advance, it may not be rocket science but sadly I'm no rocket scientist Help please with Tek 545A Oscilloscope
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Old 10th December 2018, 09:46 PM   #12
dhaen is offline dhaen  Europe
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I think you need to look at the instruction manual first. There was a time - a time when these were produced - circa 1957, when you were expected to have a degree in electronics to be using one.
It's equally likely that a passive component has failed as a Tube (valve if you're English.
Although these were made in a golden period for quality, expect a lot of deterioration due to time and use.
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Old 10th December 2018, 10:14 PM   #13
Duke58 is offline Duke58  United States
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Those 5642 valves look a little crispy to me. I've seen them provide a light show when they go out. Not too expensive here across the pond, don't know what they cost/availability in the UK. I've got over 50 of them, probably cost more to ship than they cost.
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Old 10th December 2018, 11:33 PM   #14
Jazid is offline Jazid  United Kingdom
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Hi Duke58,
I think the crispy quality might be photo related, they aren't either blackened or discoloured when you can see them, and I have a reasonable degree of valve experience.

Of course it's not a valve I have specific experience of so excuse the presumption, but they were all glowing happily and the same when I fired the scope up today.
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Old 10th December 2018, 11:42 PM   #15
Jazid is offline Jazid  United Kingdom
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Quote:
Originally Posted by dhaen View Post
I think you need to look at the instruction manual first. There was a time - a time when these were produced - circa 1957, when you were expected to have a degree in electronics to be using one.
It's equally likely that a passive component has failed as a Tube (valve if you're English.
Although these were made in a golden period for quality, expect a lot of deterioration due to time and use.
Oh dhaen, I've looked, believe me!
I have no electronics degree and I wish I did, though I have a few others in various sciences. Nevertheless my teenage maths is a hurdle, a brutal reminder that childhood effort can pay...
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