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I have restored one of these. The transistor types are not too critical, you could use just about any old Ge small signal transistors of the right polarity if you can find them. Maybe even silicon. I

They're simple 78xx or 79xx regulators.? Do please ask. Datasheets available (at least on the one I have). Harvey

Right here seems

Looking for a place to ask a repair question for TEK 1103 Scope Probe Power Supply

So the collector of Q386 was running a little less negative than in the working unit. That's a diode drop below the gate of Q392 (confirmed), which seemed relevant. It's also a diode drop below the

My question is whether the RU800 would work better in the 2445 than in the 2465. I understand that there is some bandwidth limitation with the RU800, and that might not be a problem when the scope has

I'd fix up the 2465A first. Put U800 on a socket if you have to replace it. It will make putting in an RU800 so much easier if necessary. FWIW I installed the first generation RU800 in my 2465 and it

Hi Dave, If it is the one I had sold him, then you're braver man than I thats for sure. But i do still have some notes on my repairs from when i was fixing it feel free to contact me if you'd like to

So the displayed voltage of channel 1 was shifting with trace alternation. The rest of this will make more sense with reference to "output amplifiers <2>" schematic. See page 51 in this PDF on

Rebonjour! Update: Cleaned a bit, can use a standard 9V alkaline batt with snaps. Output is IN CAL for freq and 1V at jack. Needed an adapter, 1.125" to 0.500" reducer to fit my GR mics into the

Dave, I think that the concentric pot assembly has nylon spacer joining the two pots. Within that spacer is an insulated shaft. There is a nylon section between two metal shafts. It is possible that

Output clip and integral clip may be what you need to add to your code... I found this tutorial very helpful... http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/

Now I'm not sure.? I'll have to go look and find out.? Was using a TDS540A, which should go to 500 Mhz.? I can switch to an active probe and see what goes on. Back after a bit. Thanks. Harvey

Steve many thanks very long time! Many thanks for the fast advise! Built 1972..1978 at least. Found three of my GenRad sound level meters to check it . Must fab a 1.125" to 0.500" aluminum cylinder to

Rogerio, R110/1/2/37 are stressed at 1/2W. Mouser has MFR200 types in stock, if you do not have 1 or 2W in stock. The 2W Mouser has is cheaper than the 1W types and the additional power capacity will

Perhaps input frequency is too high for your scope to show the sharp edges but otherwise sine wave is not expected at U329 inputs, it should look like a square wave. Do you see the correct waveform at

Rogerio, Beamfinder switch is a sore spot in a LOT of tek gear. Clean and lubricate if you even suspect a problem with it. On the 576 the "cal zero and invert" switch pack is a realy soar spot and

Thank you for teh replies. My board is the new model (670-4126-00). I have measured all the resistors, but without desoldering one leg and they all seem ok. I am suspicious of S1125 (beam finder),

Mercury batteries used mercuric (II) oxide. Mercuric oxide is toxic and can be absorbed through inhalation as well as exposure to bare skin. Not nearly as bad as dimethymercury (one drop even with a

Bonjour a tous, restoring a 1972 GenRad Sound Level Calibrator 1562-A https://www.ietlabs.com/pdf/Datasheets/1562.pdf Used to calibrate measurement precision mics like Sound level meters like Genrad