Re: P6137 scope probe repair

Dave Wise

?To my knowledge, the only Tek probe that uses standard coax instead of lossy resistance wire coax is P510 sold with the 535 in 1953. Rings like crazy but beyond vertical amp cutoff. The next model, P410 for the 545 and type K plugin, is lossy, and AFAIK every HF probe since.

Dave Wise

From: <> on behalf of Roy Thistle via <>
Sent: Saturday, January 16, 2021 7:43 AM
Subject: Re: [TekScopes] P6137 scope probe repair

On Sat, Jan 16, 2021 at 04:07 AM, Jared Cabot wrote:

probe cables are deliberately resistive or something
The "coax" is not normal 50 ohm coax... on high performance/high frequency probes.
It is usually a kind of "lossy" coax, which uses a shaped mono-filament resistance wire for the center conductor. That wire is somewhat brittle (compared to copper)... and shatters or cracks... when bent, mutilated, or stapled.
Usually if you buy a high performance probe for a song...without testing it... the song you might end up singing is from the blues.
Clueless sellers tie them up like the ribbons or bows on a Christmas presents... often using twist ties.

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