Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- TekScopes
- Messages
Search
Re: Tek 576 Curve Tracer HV Transformer winding
Hi Peter,
toggle quoted message
Show quoted text
Mine moves exactly one division too Vert Offset Horiz Pol Max Peak Series Resistor Left/Right 0.5mA 0 50v +NPN 1500v 3k (220W) off (no component) Turn the variable collector supply so the trace reaches to 10 div. What happens to the left end of the trace? Mine moves over 1 div. -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de peter bunge Enviado el: domingo, 25 de agosto de 2019 18:34 Para: [email protected] Asunto: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding This may be of interest to the Tek Group so I am going on line again. I got my 576 working again. It was one of the push-on connectors on the top left board. I have had trouble with those long ago on a 465 scope. I just ran an insulated rod along them until the trace re-appeared. I will have to go around the entire curve tracer with a pair of plyers and pull off and push on each one. It solves many problems. I would appreciate you doing a couple of tests: Vert Offset Horiz Pol Max Peak Series Resistor Left/Right 0.5mA 0 50v +NPN 1500v 3k (220W) off (no component) Turn the variable collector supply so the trace reaches to 10 div. What happens to the left end of the trace? Mine moves over 1 div. Reset to the following with a 2N3565 (high gain NPN) 2uA 0 0.1v +NPN 10v 30 ohm Step Gen, 0.05 uA, Zero, Steps, Rep Norm, 3 steps turn the collector to full scale as shown (1 volt). The first trace is not really dim, it is the camera. Do you see a similar set of curves. I am most interested in the looping. [image: 2N3565.jpg] On Sat, Aug 24, 2019 at 3:11 PM Miguel Work <harrimansat@...> wrote:
I have two 576, if you told me which test you need to compare, I will |
Re: Plug for 7CT1N captive lead?
The low 100 mV / division vertical sensitivity, a very low operating frequency and the shortness of the lead are the reasons why Tek did not shield this connection.
Anything that completes the circuit to the center pin is sufficient. I suggest soldering or crimping a pin on the end of the lead, followed by several layers of gradually larger shrink tubing to provide a handle and stop the lead from falling inside the 7CT1N when retracted. A rigid plastic probe handle cut short and epoxy (JB Weld?) might also work. At a maximum voltage of 0.8 volts, there should be no safety issues. Regards, Cliff Carrie ________________________________ From: [email protected] <[email protected]> on behalf of EB4APL <eb4apl@...> Sent: Sunday, August 25, 2019 1:16 PM To: [email protected] <[email protected]> Subject: Re: [TekScopes] Plug for 7CT1N captive lead? Maybe it can be seen from here: Regards, Ignacio EB4APL El 25/08/2019 a las 19:14, EB4APL escribi¨®: I'm sorry, I forgot that attachments are not allowed. I will upload it--- El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus. |
Re: Tek 576 Curve Tracer HV Transformer winding
peter bunge
The picture does not show.
I will attach. Note this is low voltage (1v full scale) and very low current in base and collector. On Sun, Aug 25, 2019 at 12:34 PM peter bunge via Groups.Io <bunge.pjp= [email protected]> wrote: This may be of interest to the Tek Group so I am going on line again. |
Re: Tek 576 Curve Tracer HV Transformer winding
RustySparks
If our cores can be rewound that may make things easier? I would pay $200 for either new or rewound 453 HV XFMR done with professional quality. Doesn't make good economic sense I agree, but I would gladly pay that, both for sentimental reasons and to get the ball rolling in the first place.
toggle quoted message
Show quoted text
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Chuck Harris Sent: Sunday, August 25, 2019 10:45 AM To: [email protected] Subject: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding If you guys are all willing to pay in the $200-300 range, like the custom made stuff that was done for the 576, I'll start winding again. -Chuck Harris Dave Daniel wrote: And 547s and 7934s ... |
Re: Plug for 7CT1N captive lead?
Maybe it can be seen from here:
Regards, Ignacio EB4APL El 25/08/2019 a las 19:14, EB4APL escribi¨®: I'm sorry, I forgot that attachments are not allowed. I will upload it somewhere and I'll send the link.--- El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus. |
Re: Plug for 7CT1N captive lead?
I'm sorry, I forgot that attachments are not allowed. I will upload it somewhere and I'll send the link.
El 25/08/2019 a las 19:11, EB4APL via Groups.Io escribi¨®: Could this be used? It is with me more than 40 years, probably it was--- El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus. |
Re: Tek 576 Curve Tracer HV Transformer winding
peter bunge
This may be of interest to the Tek Group so I am going on line again.
toggle quoted message
Show quoted text
I got my 576 working again. It was one of the push-on connectors on the top left board. I have had trouble with those long ago on a 465 scope. I just ran an insulated rod along them until the trace re-appeared. I will have to go around the entire curve tracer with a pair of plyers and pull off and push on each one. It solves many problems. I would appreciate you doing a couple of tests: Vert Offset Horiz Pol Max Peak Series Resistor Left/Right 0.5mA 0 50v +NPN 1500v 3k (220W) off (no component) Turn the variable collector supply so the trace reaches to 10 div. What happens to the left end of the trace? Mine moves over 1 div. Reset to the following with a 2N3565 (high gain NPN) 2uA 0 0.1v +NPN 10v 30 ohm Step Gen, 0.05 uA, Zero, Steps, Rep Norm, 3 steps turn the collector to full scale as shown (1 volt). The first trace is not really dim, it is the camera. Do you see a similar set of curves. I am most interested in the looping. [image: 2N3565.jpg] On Sat, Aug 24, 2019 at 3:11 PM Miguel Work <harrimansat@...> wrote:
I have two 576, if you told me which test you need to compare, I will do |
FG502 Troubleshooting Help Requested
Hello.
My FG502 has no signal at the Output jack (but there is DC at the Output jack as described below) and no signal or voltage at the Trigger Out. The positive (+20, +17) and negative (-20, -17) voltage rails are correct. With reference to the Triangle Generator schematic (Diagram 1): 1. There is no triangle signal at the emitter of Q210. 2. There is no square wave signal at R255. 3. There is nothing at Trigger Out. 4. With the frequency dial at 5, the voltages at Pin 6 of U140 and U175 are +11.71 and -11.57 I removed Q140 and Q175 and they test okay. I removed Q200 and Q202 and they test okay. I removed Q292 and Q290 and they test okay. I removed Q230 and both sections tested okay. I tested all diodes in-circuit in the 3 bridges shown on the schematic and they tested okay. At the front panel Output, with the offset switch off, the following voltages appear at the following switch positions: Sine: -11.71, Sawtooth +10.9, Square +1.9, Pos Ramp, +11.2, Neg. Ramp +12.1, Pos. Pulse +2.3V, Neg. Pulse +2.3 I'm stumped. I would appreciate input on what the collector voltages should be at Q292 and Q290, and any ideas on where to go from here in my troubleshooting. Thanks. Dave. |
parting out 2) 7633's and a 7613 storage scope unless... $55 shipping each in US
John Griessen
Starting disassembly on the 7613. It has power, vertical, horiz pos., no sweep, no store.
7633 B152130 gives a flooded screen, 7633 B111088 has no power with fuse intact, and power present at the PS rectifier board input, so needs PS debug. One of the 7633's had covers with 6 latches and RF shorting edging. no vents. Could make an RF tighter cover for any 3 bay 7xxx with proper vent holes drilled. |
Re: Tektronix 585A Voltage Diagnoses Problem edited
Chuck Harris
Everything is referenced to the -150V supply. It must
toggle quoted message
Show quoted text
be right, or the others will behave truly weird... like you are seeing. Start there. Also, the 585A has DC filaments. If it doesn't have a plugin, it switches off the -100V supply that is used to power the filaments on the plugin... Or, it has an internal dummy load... can't remember right now. -Chuck Harris randolphbeebe@... wrote: Hello All, |
Re: Tek 576 Curve Tracer HV Transformer winding
Chuck Harris
If you guys are all willing to pay in the $200-300 range, like
toggle quoted message
Show quoted text
the custom made stuff that was done for the 576, I'll start winding again. -Chuck Harris Dave Daniel wrote: And 547s and 7934s ... |
Re: Plug for 7CT1N captive lead?
Hi,
toggle quoted message
Show quoted text
I¡¯d never heard of ¡®gaffer tape¡±. Why not just plane plastic electrical tape? Larry On Aug 25, 2019, at 5:37 AM, EJP <esmond.pitt@...> wrote: |
Re: Tek P6xxx probe reference question
Hi,
toggle quoted message
Show quoted text
Interesting! First, somehow I would not expect Tek to reduce themselves as you describe (obsolescence). Second, the meaning of the size (2.33 - 2 MHz). Thanks, larry On Aug 24, 2019, at 9:38 PM, John Griessen <john@...> wrote: |
Re: Tek 576 Curve Tracer HV Transformer winding
And 547s and 7934s ...
toggle quoted message
Show quoted text
DaveD On 8/25/2019 8:12 AM, RustySparks wrote:
I wonder if the same company could make a batch of HV transformers for the 453 scope? I think several users of this group, including myself, have 453 scopes with bad HV transformers. |
Re: Tek 576 Curve Tracer HV Transformer winding
RustySparks
I wonder if the same company could make a batch of HV transformers for the 453 scope? I think several users of this group, including myself, have 453 scopes with bad HV transformers.
toggle quoted message
Show quoted text
Thanks, Harry -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of drawding@... Sent: Sunday, August 25, 2019 1:25 AM To: [email protected] Subject: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding "Where do they get the cores to make a compatible transformer that works in the 576 circuit. This is not a 115v 60 Hz transformer." I believe that they make them in house. I sent them the original Tek transformer specification. I got the specification drawing from Bob Koller (now posted online as per this thread). Thanks, Dave |
to navigate to use esc to dismiss