
Re: Damaged 606
Looks as damage to the internal electron gun supports, CRT is toast :(
Looks as damage to the internal electron gun supports, CRT is toast :(

By
satbeginner
·
#163646
·


Re: Risetime calculator (in tekwiki)
I had thought it was known that the pots in the Rise Time Calculator were known to be log taper, or some kind of log taper (by a collector who had one, and had measured their tracking). In fact this
I had thought it was known that the pots in the Rise Time Calculator were known to be log taper, or some kind of log taper (by a collector who had one, and had measured their tracking). In fact this

By
Roy Thistle
·
#163645
·


Damaged 606
Hello,
I bought a Tektronix 606 off eBay. When I tested it I get this:
https://imgur.com/a/cLOaOVu
There's a bright spot fixed at the center. There's a movable spot, or
short line pointed towards
Hello,
I bought a Tektronix 606 off eBay. When I tested it I get this:
https://imgur.com/a/cLOaOVu
There's a bright spot fixed at the center. There's a movable spot, or
short line pointed towards

By
Lars Brinkhoff
·
#163644
·


Re: Risetime calculator (in tekwiki)
Working from what you said/did, and my own schematic drawing:
if the 4.95K resistor + the trimpot = 5K for 5, which has been the assumption so far?
if the wiper divides the total resistance of the pot
Working from what you said/did, and my own schematic drawing:
if the 4.95K resistor + the trimpot = 5K for 5, which has been the assumption so far?
if the wiper divides the total resistance of the pot

By
Roy Thistle
·
#163643
·


Re: Risetime calculator (in tekwiki)
Sorry... should be (2,3,4), (29).
Yes, any Pythagorean triple would work, if you take it that a pot can go to true 0 linearly?... most don't?... there is a step nonlinearity... but I haven't thought
Sorry... should be (2,3,4), (29).
Yes, any Pythagorean triple would work, if you take it that a pot can go to true 0 linearly?... most don't?... there is a step nonlinearity... but I haven't thought

By
Roy Thistle
·
#163642
·


Re: Risetime calculator (in tekwiki)
One thing about engineers from the slide rule era, is they
were very, very, good at approximations, or they couldn't
make the slide rule do beans.
The slide rule handled the fractions, the engineer
One thing about engineers from the slide rule era, is they
were very, very, good at approximations, or they couldn't
make the slide rule do beans.
The slide rule handled the fractions, the engineer

By
Chuck Harris <cfharris@...>
·
#163641
·


Re: Risetime calculator (in tekwiki)
You probably meant (2,0,5) Roy?
A =3 , B = 4, F = 5 (and C = 0) would easier be recognized, a familiar integer "Pythagoras" solution.
Albert
You probably meant (2,0,5) Roy?
A =3 , B = 4, F = 5 (and C = 0) would easier be recognized, a familiar integer "Pythagoras" solution.
Albert

By
Albert Otten
·
#163640
·


Re: Risetime calculator (in tekwiki)
Never mind, thencamethedawn; three different scales to get from 0 to 20 and I assume that proportionally you can try to put your values as close to center dial as possible for greater accuracy by
Never mind, thencamethedawn; three different scales to get from 0 to 20 and I assume that proportionally you can try to put your values as close to center dial as possible for greater accuracy by

By
GerryR <totalautomation1@...>
·
#163639
·


Re: Risetime calculator (in tekwiki)
Hi GerryR:
Blue scale is 0 to 5
Black is double Blue so 0 to 10
And Red is double Black so 0 to 20
That's 2^0, 2^1, 2^2, for 1,2,4 multipliers.
If it is like others, of these type of simple analog
Hi GerryR:
Blue scale is 0 to 5
Black is double Blue so 0 to 10
And Red is double Black so 0 to 20
That's 2^0, 2^1, 2^2, for 1,2,4 multipliers.
If it is like others, of these type of simple analog

By
Roy Thistle
·
#163638
·


Re: Risetime calculator (in tekwiki)
If you look at the dials, each is calibrated 0 thru 10. Then there are numbers in red, 0 20 and another series 05. Just trying to figure out what the different scales mean in the context of rise
If you look at the dials, each is calibrated 0 thru 10. Then there are numbers in red, 0 20 and another series 05. Just trying to figure out what the different scales mean in the context of rise

By
GerryR <totalautomation1@...>
·
#163637
·


Re: What Tektronix means to me
Heh, well, not that I know about lazy.....
74181 and 7489's. Timing generated by a counter that gave 8 decoded time states per instruction, fetch, operate, adjust, etc.
I actually bought stuff
Heh, well, not that I know about lazy.....
74181 and 7489's. Timing generated by a counter that gave 8 decoded time states per instruction, fetch, operate, adjust, etc.
I actually bought stuff

By
Harvey White
·
#163636
·


Re: 2465B  Weak Readout Intensity
When I was servicing TV's (mid 60's!) we carried, in our tube caddy tiny autotransformers that would, for most BW tubes plug inline with the socket and boost the heater voltage by a volt or so. For
When I was servicing TV's (mid 60's!) we carried, in our tube caddy tiny autotransformers that would, for most BW tubes plug inline with the socket and boost the heater voltage by a volt or so. For

By
Bruce Atwood
·
#163635
·


Re: What Tektronix means to me
I said I was greedy... It didn't serve my purposes to also
mention that I was lazy.
I thought it wasteful to use ripple carry on the S181's, so
I included the S182's with their carry look ahead, or
I said I was greedy... It didn't serve my purposes to also
mention that I was lazy.
I thought it wasteful to use ripple carry on the S181's, so
I included the S182's with their carry look ahead, or

By
Chuck Harris <cfharris@...>
·
#163634
·


Re: Tektronix 532 LV rail shorted
Hi Rajesh,
I replaced the fuse and went to retest the voltages and now found no voltage whatsoever on transformer pin 16 that supplies the 150V rail. This is where I measured +89V AC before as well
Hi Rajesh,
I replaced the fuse and went to retest the voltages and now found no voltage whatsoever on transformer pin 16 that supplies the 150V rail. This is where I measured +89V AC before as well

By
randolphbeebe@...
·
#163633
·


Re: Risetime calculator (in tekwiki)
The dial scale values indicate numbers you want to
feed the equation SQRT(A^2 + B^2 + C^2) = f
In this case, if you set them to microseconds, f will
be in microseconds... nanoseconds, f will be in
The dial scale values indicate numbers you want to
feed the equation SQRT(A^2 + B^2 + C^2) = f
In this case, if you set them to microseconds, f will
be in microseconds... nanoseconds, f will be in

By
Chuck Harris <cfharris@...>
·
#163632
·


Re: Risetime calculator (in tekwiki)
Hi Dennis,
You are trying to force the math.
Remember the whole point behind logarithms is they
turn difficult to do multiplication, and division
into easier to do addition and subtraction,
Hi Dennis,
You are trying to force the math.
Remember the whole point behind logarithms is they
turn difficult to do multiplication, and division
into easier to do addition and subtraction,

By
Chuck Harris <cfharris@...>
·
#163631
·


Re: 2465B  Weak Readout Intensity
If you do decide to go with an ebay seller, pay
particular attention that all of the wires, plugs,
and cables come with the CRT. Most scrappers think
the wires and cables are unimportant, and snip
If you do decide to go with an ebay seller, pay
particular attention that all of the wires, plugs,
and cables come with the CRT. Most scrappers think
the wires and cables are unimportant, and snip

By
Chuck Harris <cfharris@...>
·
#163630
·


Re: Risetime calculator (in tekwiki)
This is one heck of a rabbithole!
I wonder what would the calibration process be?
There are nine adjustable parameters  assuming knobs have grub screws.
Leo
This is one heck of a rabbithole!
I wonder what would the calibration process be?
There are nine adjustable parameters  assuming knobs have grub screws.
Leo

By
Leo Bodnar
·
#163629
·


Re: Risetime calculator (in tekwiki)
Very interesting! I've spent more time than I could afford this morning, trying to reconcile your math with mine. I finally figured out that the "linear component" just moves the origin along the X
Very interesting! I've spent more time than I could afford this morning, trying to reconcile your math with mine. I finally figured out that the "linear component" just moves the origin along the X

By
Steve Hendrix
·
#163628
·


Re: Risetime calculator (in tekwiki)
Dennis,
What do the dial scales values indicate??
GerryR
KK4GER
Dennis,
What do the dial scales values indicate??
GerryR
KK4GER

By
GerryR <totalautomation1@...>
·
#163627
·
