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Jack, I do not know if the FETs are factory or not. The screwdriver adjustment for d-c balance is in the screen circuits which is likely not connected to anything in these adapters. That will cause

Thanks!

Thanks!

12BA6s are easy to find and their rating are close. Try them if 12AU6s are hard to find. Because there are four of the 12AU6s, it may be possible to use easy to get 6AU6s by rewiring the filament

Can anyone identify these parts I find in my 575 curve tracer. Is this a mod that tek made? The dc balance doesn’t adjust properly, and the dc adjust pots appear to have been replaced with

The following photos have been uploaded to the Pictures of substitute parts for the 12au6s in my 575 curve tracer ( /g/TekScopes/album?id=299641 ) photo album of the

Anita Abranovic <anita.abranovic@...> added the photo album Pictures of substitute parts for the 12au6s in my 575 curve tracer ( /g/TekScopes/album?id=299640 ) : Can

Anita Abranovic <anita.abranovic@...> added the photo album Pics of substitute parts for the 12au6s in my 575 curve tracer ( /g/TekScopes/album?id=299639 )

Barry Testing transistors out-of-circuit on a Tester is NOT a fail-safe diagnosis. I also have an Peak Atlas DCA, and many's the time that it showed a transistor OK, but under load in the circuit it

Mark, Replace the FET, maybe both. Also Q50 is rated at 12V. That could have gone bad due to the increase in voltage. Something like a KSP10BU that is 25V would replace Q50. Mark

Look at the FET specs, 30v PS overvolt may have damaged the FET. Definitely abnormal if it's hot. Check the FET current Jon

From memory, an '8.' on the 7-segment display often indicates the scope can't read the contents of NVRAM. Jared

Hello from central TX! I have a DC503 counter where it's difficult to get the input A level adjusted correctly. Connecting a scope at any point between the input JFET pair and the TTL logic, you can

Since you have all the transistors in a socket: - Does removing Q7042 and Q7051 make output go ~ +0.6V, if not power transistor is bad/leaky. When all transistors are in the socket, what are the

Jean-Paul, Thanks for the reply. I should have mentioned that I pulled the board from the scope and am troubleshooting only the board. I tested all the caps in the -12V circuit. Barry

Shorted tant at collector, -12 bus? J

Greetings for Louisiana! I have an SC503 that has an issue with the -12V Power Supply. When I started troubleshooting the PS I came across a bad transistor, Q8052, plus several tantalums. At that

Hello everyone, I would like to tell you about the error. The oscilloscope can be switched on, the fan is running and the Key lighting stays on permanently. On the A11 DRAM Processor/Display Board

Mainly https://www.eevblog.com/forum/testgear/automating-tektronix-field-adjustment-software-for-tds-oscilloscopes/msg1388658/#msg1388658 more details about

I worked at Tek at the time, although not on the projects using the Tri-Star. The architect was Chuck Sax, who also created the "chuck's Pipe" - a CMOS bucket brigade chip that is the basis of the