Hi,
I've 3 power transformer from Tektronix 545 oscilloscopes.
I figured out the specs for the heater winding (by means of
the handbook/service manual).
But I have no clue for the high voltage current ratings.
Does any of you have any info on these trannies ?
There are 100+ tubes in this scope so I think they are
pretty beefy.
Thanks,
Jim
I've 3 power transformer from Tektronix 545 oscilloscopes.
I figured out the specs for the heater winding (by means of
the handbook/service manual).
But I have no clue for the high voltage current ratings.
Does any of you have any info on these trannies ?
There are 100+ tubes in this scope so I think they are
pretty beefy.
Thanks,
Jim
Attachments
Doesn't the schematic show the load on each? I recall that each winding had 10 Ohm power resistors which were used as current test points.
If not, you can measure the DC resistance and allow 2W dissipation for each. So a 10 Ohm winding can handle 450 mA (.45^2 * 10 = 2.02W). Maybe a little more if some windings are left unloaded.
Naturally you can series connect windings for the voltage you want - Tektronix did.
A stereo 6550 amp would be no problem with one of these...
If not, you can measure the DC resistance and allow 2W dissipation for each. So a 10 Ohm winding can handle 450 mA (.45^2 * 10 = 2.02W). Maybe a little more if some windings are left unloaded.
Naturally you can series connect windings for the voltage you want - Tektronix did.
A stereo 6550 amp would be no problem with one of these...
I've also got a few salvaged Tek scope transformers, sitting on a shelf awaiting a new call to service. I don't know that this will help you a whole lot, but I've attached the schematic for the 545 supply if you don't have it already. You can get at least some idea of each winding's prowess by looking at the regulator that goes with each one.
Tek 545 power supply
Tek 545 power supply
Those old Tek trannies are great for projecs,and experimenting.I've got a couple here..Loads of windings to play with!
Humm.. 545 huh? Whats the number on the tranny? (120-xxx or something?)
*digs around*
Dean Kidd: dektyr(at)teleport(dot)com
or
Stan: w7ni(at)easystreet(dot)com
Can probably help you out,they've helped me find specs for Tek trannies before.
Another good place to check would be:
http://groups.yahoo.com/group/TekScopes/
Humm.. 545 huh? Whats the number on the tranny? (120-xxx or something?)
*digs around*
Dean Kidd: dektyr(at)teleport(dot)com
or
Stan: w7ni(at)easystreet(dot)com
Can probably help you out,they've helped me find specs for Tek trannies before.
Another good place to check would be:
http://groups.yahoo.com/group/TekScopes/
And here's the power supply schematic to the Tek 531/541. It is very similar to the 545 power supply I posted above. Which means that if we can believe the Fair Radio ratings provided for the 531 transfomer, the 545 rating ought to be close to the same. Note also that in the 531/541 schematic, voltage drops across the 10 ohm resistors are given.
DigitalJunkie said:Those old Tek trannies are great for projecs,and experimenting.I've got a couple here..Loads of windings to play with!
Humm.. 545 huh? Whats the number on the tranny? (120-xxx or something?)
*digs around*
Dean Kidd: dektyr(at)teleport(dot)com
or
Stan: w7ni(at)easystreet(dot)com
Can probably help you out,they've helped me find specs for Tek trannies before.
Deane Kidd sent me the ratings for the Tek transformer I have :
Not the 545, but this might be helpful for somebody. (And if anyone knows the current ratings for the transformer from the 521 vectorscope...)
Tektronix 555 oscilloscope 120-128:
234V mains: 1-4 (link 2, 3)
E/S screen: 27
Winding Voltage Current
9-10 208V 160mA
20-21 204V 50mA
11-12 126V 250mA
13-14 126V 250mA
Tektronix 555 oscilloscope 120-127:
234V mains: 1-4 (link 2, 3)
E/S screen: 21
Winding Voltage Current
5-6 6.3V 0.35A
10-11 6.3V 10A
12-13 6.3V 6A
14-15 148V 160mA
Tektronix 521 vectorscope 120-0498-00:
240V mains: 1-4 (link 6, 7) (Two windings 1, 5, 3, 6: 4, 8, 2, 7)
E/S screen: 9
Winding Voltage Current
17-18 6.3V ? CRT
15-16 180V ?
13-14 105V ?
12-11-10 28.5-0-28.5V ?
Tektronix 555 oscilloscope 120-128:
234V mains: 1-4 (link 2, 3)
E/S screen: 27
Winding Voltage Current
9-10 208V 160mA
20-21 204V 50mA
11-12 126V 250mA
13-14 126V 250mA
Tektronix 555 oscilloscope 120-127:
234V mains: 1-4 (link 2, 3)
E/S screen: 21
Winding Voltage Current
5-6 6.3V 0.35A
10-11 6.3V 10A
12-13 6.3V 6A
14-15 148V 160mA
Tektronix 521 vectorscope 120-0498-00:
240V mains: 1-4 (link 6, 7) (Two windings 1, 5, 3, 6: 4, 8, 2, 7)
E/S screen: 9
Winding Voltage Current
17-18 6.3V ? CRT
15-16 180V ?
13-14 105V ?
12-11-10 28.5-0-28.5V ?
Here's some more...
Transformer 120-0103-00.
1 - 3 & 2 - 4 are 117 v Primary
10 - 11 6.5 v 2.5 A
13 - 12 6.5 v 5.0 A
18 - 19 6.5 v 8.0 A
29 - 30 6.5 v 4.0 A
7 - 14 270 v 200 ma
8 - 15 235 v 200 ma
9 - 16 122 v 100 ma
22 - 23 6.5 v 2.5 A
20 - 21 6.5 v 0.6 A
24 - 25 6.5 v 0.3 A
17 - 26 6.5 v 0.3 A
27 - 28 6.5 v 3.5 A
3 - 6 6.5 v 2.5 A
*****
Transformer 120-296:
Pins 1-3 and 2-4 are primaries that can be wired in series for 240 volt
operation or parallel for 120 volt operation.
Pin 5-6 are 6.5 volts at 4.0 amps
Pin 7 is a "shield"
Pins 8-9 are 6.5 volts at 4.0 amps
Pins 12-13 14.0 volts at 2.0 amps
Pins 13-14 14.0 volts at 2.0 amps
(Pin 13 is the centertap of 12-14)
(Pins 15-16 100V ~100ma)
Pins 17-18 150 volts at 0.370 amps
Pins 19-20 157 volts at 0.210 amps
Pins 21-22 135 volts at 0.150 amps
There is a pair of white and red wires: 6.5 volts at 0.6 amps (insulated
for 3300 volts DC)
There are two pairs of yellow and red wires. Each pair is 6.5 volts at 4.0
amps.
Transformer 120-0103-00.
1 - 3 & 2 - 4 are 117 v Primary
10 - 11 6.5 v 2.5 A
13 - 12 6.5 v 5.0 A
18 - 19 6.5 v 8.0 A
29 - 30 6.5 v 4.0 A
7 - 14 270 v 200 ma
8 - 15 235 v 200 ma
9 - 16 122 v 100 ma
22 - 23 6.5 v 2.5 A
20 - 21 6.5 v 0.6 A
24 - 25 6.5 v 0.3 A
17 - 26 6.5 v 0.3 A
27 - 28 6.5 v 3.5 A
3 - 6 6.5 v 2.5 A
*****
Transformer 120-296:
Pins 1-3 and 2-4 are primaries that can be wired in series for 240 volt
operation or parallel for 120 volt operation.
Pin 5-6 are 6.5 volts at 4.0 amps
Pin 7 is a "shield"
Pins 8-9 are 6.5 volts at 4.0 amps
Pins 12-13 14.0 volts at 2.0 amps
Pins 13-14 14.0 volts at 2.0 amps
(Pin 13 is the centertap of 12-14)
(Pins 15-16 100V ~100ma)
Pins 17-18 150 volts at 0.370 amps
Pins 19-20 157 volts at 0.210 amps
Pins 21-22 135 volts at 0.150 amps
There is a pair of white and red wires: 6.5 volts at 0.6 amps (insulated
for 3300 volts DC)
There are two pairs of yellow and red wires. Each pair is 6.5 volts at 4.0
amps.
jim said:
(-Digging up an old thread-)
Excellent!
You say it's similar to the 120-120 transformer?
I just happen to have a #120-120 sitting here,I'm thinking of using it in a project,but it would be nice to have the spec's..
IIRC,I've emailed Dean once about it,a while ago,but he didn't have any records of it.
(That's where I got the info on the other transformers I posted above. ) I hope the 120-120 will have suitable current ratings on the HV windings.
I don't suppose anyone has any info on it?
I might have to do some load testing.
Nevermind!!
http://www.pmillett.com/Tek_xfmrs.htm
Awesome!! Thanks Pete!
Any idea of the current ratings? -once again,nevermind..it's posted above!
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