Many years ago when I was in the military we had a device that used transistors like these. We had so many bad ones, one of the guys built a voltage sweep circuit we hooked up to a scope so we could t

Folks, If you are working on an early solid state scope or whatever, I have a 1969 Motorola Semiconductor handbook (about 3 inches thick!). It lists about every semi-conductor (transistors,ICs,diodes

Response to hot running scopes: As my 442 would quite when it got too hot (I live near Sacramento CA, and it gets very hot here), I added a cooling fan. It is mounted outside the case in the back atta

Dave, I had a similar problem on my 442. Turned out to be a failing power supply regulating transistor in the circuit feeding the HV supply. It had only partially failed, and so the scope took forever

Dave, Try this. Spray some cool air as from an air compressor on the power supply regulating transistors or ICs. Do not use freeze spray as it is too cold and could damage something. Does anything cha

I purchased mine at Qservice qservice@... Bob

Hi folks, Thanks for all the tips in this forum. I am just stating to work on a used 7603 with three plug-ins (7A18A, 7D15, 7B70) I acquired cheap as a second scope with a 442 I got also got cheap (ne

Thanks all for the discussion. I have ordered new caps as well as an ESR meter. I expect the new caps will help, but am also curious as to the condition of the old ones. By the way, the comment about

The group can reply if they disagree, but I would start with the power supply. Make sure all voltages and ripple are within spec. Everything else depends on the power supply working correctly. If you

There are lens polishing kits in automotive stores for headlines lens. If the plastic is compatible, it might work Bob

I am attempting to restore a 7603 I purchased locally. According to the owner, it worked for many years then one day he couldn't get a trace. Power supply check out voltages ok and ripple about 1-2 mv

Jerry, Thanks for the tip. This is what I have decided. I don't have High Voltage experience or equipment. My experience and equipment is sub kilovolt. So, since this is my second not working used 760

Although I am familiar with the need to adjust probe compensation, I just came on a fine point on this subject. I am teaching myself to work on switch mode power supplies on TVs, so using differential

In the process of restoring a 7603, I am about to work on the 7A18A that came with it. I have downloaded an operator/service manual. The main problem is the CH1 Volts/Div switch is flaky. That is, whe

This might help those who indicated they have cleaned the switch contacts on their scope but still have problems. I just finished working on attenuator contacts in a 7A18A and a 7A26 plug-in. Both had

Although I don't have this particular scope, I have worked on fans. What kind of bearings? Usually they are either sintered bronze sleeve bearings or ball bearings. The rebuilding process depends on w

How did you fix yours? � Although what I did worked, I suspect I was partly lucky. I haven�t yet checked all recently acquired plug-ins, so I probably will need to do this again. I am collecting best

The Tek cross ref book I have shows a 151-0102-00 as a PNP Germanium transistor SP1398/MP504. T0-36 case, Ic15 ma, hfe 50-100, Breakdown volts 45cbo, 30ceo,25ebo,60ma max. from Oct1982 common parts ma

I am somewhat new to using Differential Mode. I read the Tektronix PDF on this and some other articles, plus some earlier posts. I believe I am in need of a differential amplifier for my 7603. I am tr

Radio Shack sells AA Nicads with tabs http://www.radioshack.com/product/index.jsp?productId=2714530 I have used them to replace bad ones in my emergency flashlights. Bob