More Tektronix Oscilloscopes in 2022

About 2 weeks ago I traveled through the country in order to pick up – as one may guess – another Tektronix oscilloscope! Who would have thought? This unit was very special: a Tek 7904A with many high-speed plugins such as 7A19, 7A24, 7B92A… just to name a few.

The seller was very kind and showed me more stuff laying around in the basement. There were some vintage instruments on a dusty shelf but the Tektronix R556 dual-beam oscilloscopes really caught my eye. We discussed about the future of some of the test equipment and we agreed to “dispose” it the “proper” way: load it in my car and drive it to a place where it will be treated with love and respect… my apartment! 😉

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Those are beefy and heavy… boat anchors… err oscilloscopes 😉

I’m a TEA with somewhat heavy GAS, that’s for sure. But I have never possessed anything like a Tektronix 556 dual beam oscilloscope. Two of them. It was very difficult to carry them around because of its mass of approx. 30 kg per unit. 

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Nevertheless, the units made it to my home without problem. Initial visual inspection showed a somewhat pristine condition! Besides dust, all vacuum tubes were present and all knobs/plugins/parts were without any visible damage.

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Side view of Tektronix R556 Dual-Beam oscilloscope. Amazing piece of late 1960’s/early 1970’s technology!

I was lucky to get two fitting bezels from Matt@Wellenkino and a proper AC power cord from eBay (type NEMA 5-15R). I’ll have to wait with power-up until order has been restored in my apartment. 😉

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The back side of the Tek R556 oscilloscope. It has a standard NEMA 5-15 AC power plug.
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Receptacle of a NEMA 5-15R cable.
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Waiting for power-up! I’ll have to check the unit first and replace old and leaky electrolytic capacitors before powering this unit up.