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Luca, Q55, as Ed B. said, is suspect. Use an hfe meter to test yours. I have seen the originals too low, beta <10. The beta would be nominal 110 at the current range the load wants by the chart for a

Check Q55's hfe around the load range. If it's not enough gain then Q850 may be working very hard and also allowing the raw supply line ripple to show at the 3.6 RTL supply when Q850 hits its

Hi I'm still looking for why my 3.6V supply has issues. The current draw of the boards doesn't seem excessive (though I don't know what's their normal power consumption - Bar Timing board draws

Here's another kind of XY oscilloscope demo. Very cool! https://www.youtube.com/watch?v=6DifrkaALOg&t=366s

Miguel, I apologize -- it's been 3 years ago and I can't remember who I was thinking of. Good luck! -ls-

Mark, I will check these things a report back. Thanks for suggestions! Mark ?? ----------------------------------. ? /? Don't take life so seriously, __/ ?/?????? it's not

Thanks, I didn't see your email. Can you send it to me again?

I don't want to speak too soon but it looks like recapping the LV supply did the trick. Ripple on all of LV rails is much lower. I've been cold starting the scope for the past few days and letting it

I can design a new knob in gray if your knob is missing or damaged. I would then suggest getting 2 so they match. The knobs are gray on most of the SC504s. I should receive the new skirts in 2

Group, I just made an order for the skirts, I have some cost to recoupe. I have 5 sets of the SC502, SC503, and SC504. Let me know if you need 1 or more. $10 each. Barry

Mark, See if swapping the horiz. interface boards make a difference. If not, the logic board is next. Swap ICs coming off of Y, Z, AA and AB and the two after the transistor array ICs. An IC could be

Barry, I recently acquired a SC504 with a broken shaft on channel one, Missing both the shaft and the knob/skirt contact me off line and lets work something out! Mark T265frc10@... ??

Mark, What you just said is exactly as you describe, well not exactly, When the separation control if fully CCW the behavior is as you describe. When you try to separate the traces the alt trace

I use Google Translate. I don't have brightness adjustment and the reverse path of the beam is visible on my 2337. The A15 board is defective. A15 Vertical Output / H.V. Power Supply board. When I

Mark, If all the plugins do the same thing in some scopes, the scopes are at fault. It sounds like they work properly when in other scopes. I do have mine set with the 'level' turned to 'runs after

Mark, Thanks for the clarification, I have 7 7B92A's serial numbers ranging from 64600 to 99661 all of which the exhibit the same behavior of having a very dim or non-existence alt. delaying sweep

Barry Breaux <groupsio@...> added the photo album SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) : If your SC503 or SC504 Volts/Div

I added some photos... /g/TekScopes/album?id=302038

Greetings from Louisiana! I have had several damaged shipments of the SC502, SC503, SC504 scopes. The Slope / Level switch-pot is damaged along with the knob. In a similar way the Volts/Div and

The 465 uses the 152-0552-00 5kV peak-to-peak x3 to 15kV multiplier which has a 510 kilohm output resistor. This thread throws light on the function of that resistor