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Probably yes, but I need to know which model. Is it a 453 below serial 20,000, a 453 above serial 20,000, or a 453A? Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

It would bear mentioning that a tunnel diode cannot be checked or tested like a conventional diode. Tunnel diodes can be damaged by such tests, -- Michael Lynch Dardanelle, AR

My 464 had similar problems. Because my TD’s plug into sockets, I tried new tunnel diodes. I was careful to grip the leads with small long beak pliers, before bending the leads to align with the

Hi Ozan, I've printed an enlarged image of that section so I can write the voltages at their proper place on the schematic. Hopefully that will keep me from making any mistakes as to what voltage at

My SG505 soon to arrive next week seems to have a badly worn out variable CAL red knob (output level) which I would like to replace as the red front face of the knob is badly chipped off. Tek PN seems

The water-based version of Goof Off (in the spray bottle) is good for this, better than Goo Gone. Be careful with it on painted surfaces, though, it tends to lighten the color a bit. Test it on an

Thanks a lot Eric for your kind offer. The 576 I got is actually quite beaten-up, there is some kind of black substance in it, like soot, as if it was rescued from a fire. It's close to being a basket

well heres a few measurements at test points on the trigger board settings are normal rigger horiz display set to A . tp 714=8.9v tp 675=5.98v tp 705=0.38v tp 604=0.835v goes to -.41v when switched A

It would help if you'd tell us what 'scope model you have and what you did to come to your conclusion. All kinds of things may be wrong. E.g. did you check the connections to the horizontal plates?

The trace on the screen begins in the middle of it. I suspect the horizontal preamp 155-0124. Can someone help me? Does anyone have such a circuit? Thank you

where do i find the b trigger pickoff on this any idea?

can i feed a 1v p-p from my other scope cal into that?

It's the BNC in the upper right-hand corner. -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu

firstly i cant see a b external trigger input,also has anyone a pic of the component placements on the ch B trigger board ?,as i cant find one in the manual i downloaded from tek wiki,cheers all

Great -- verifying supply voltages is a good first step. Next, trace signals as they progress through the trigger chain, perhaps following up on Harvey White's good suggestion. At some point, you'll

any ideas what to check?all the psu voltages are good.

Did that once when I was impatient, to smoke out a tantalum cap that had shorted out the -15V rail :-) To make a test jig like you suggest, I would just get a card-edge connector with solder lugs

It can be lots of things, of course. I am not a fan of the "random potshot" method of repair in general. The wear and tear on a pc board from unnecessary desoldering/soldering adds up. Also, TDs can

Hi Bruce, Let's try to reduce CR262 current to see if it will go to low voltage state. 7B50 is in timebase mode (not amplifier) Triggering in NORM EXT trigger, DC coupled No input (or shorted) at EXT

All: I just picked up a MDO3102. Where Channel 3 typically would be on a four channel scope, there is a Trigger Aux In BNC. The Aux In has a VPI landing area/contacts. Does anyone here know what the