Hot take: I thought buying a used oscilloscope was risky until I found a Tektronix for $80

I was dead set against buying used test gear for years. Figured anything cheap would be out of calibration or blown up from some hack job. Then a buddy told me about a guy clearing out his garage in Tuscaloosa and I took a shot on a beat-up 465. That thing works flawless after I recapped the power supply for like 15 bucks. It taught me that avionics techs dump perfectly good stuff when they upgrade, not when it breaks. Now I check local listings all the time and saved probably $600 vs buying new. Has anyone else had good luck with vintage gear from estate sales?

3 comments

3 Comments

blair_taylor321mo agoTop Commenter

My buddy in Birmingham picked up a 2235 from an estate sale for 40 bucks and it had a cracked CRT... he spent more on the replacement tube than the scope itself. I've seen too many people grab old HP gear only to find out the custom hybrid chips are unobtanium now. Those 465s are a gamble because the vertical output modules fail and you're stuck with a brick unless you find someone cannibalizing another unit. I'd rather spend the extra money on a Rigol that has a warranty and known calibration history than chase ghosts with a 40 year old scope that might drift after an hour of warmup. Plus all those electrolytic caps in old Tektronix stuff are ticking time bombs even if you recap the power supply, the HV section is a nightmare to touch without a proper HV probe. You got lucky but I've seen too many forum posts where the seller says "works great" and it's actually reading 50% high on every voltage.

wood.faith1mo ago

That reminds me of a fellow I knew up in Michigan who picked up a Heathkit scope at a garage sale for fifteen dollars. He spent three weekends trying to get it to sync properly, only to find the previous owner had swapped in a transformer from a microwave oven. He ended up turning it into a planter for his wife's succulents, which honestly worked better than the scope did.

rowan9691mo ago

The 465 vertical output modules are actually pretty repairable if you trace the issue to specific transistors like the 151-0188's, which are still available from surplus dealers for a couple bucks each. I've recapped three of those scopes now and never had to touch the HV section except to clean the anode cup, it's really just the power supply caps that cause the most problems. The drift issue is blown out of proportion too, most Tektronix scopes from that era use wirewound resistors in the critical paths that stay stable for decades. Estate sales are hit and miss but you learn to spot the signs of a cared-for unit like original manuals or calibration stickers from a known shop.