Hi All,
I used the TAP225K035SRW, from Mouser, and have the PRS10 running again.
In the process of pulling it apart I managed to break one of the glass
thermistors (Mouser replacement from US Sensor, part number 104JG1F). Doh.
Whether it was the lamp temperature change (thermistor) or mechanical
alignment now being a bit different, the frequency moved by about
300E-12 (measured by locking to my GPSDO 1PPS and comparing old to new
"SF" values).
I've also added a cooling fan so the base plate is now below 40dC. I
guess that could also affect the frequency.
Cheers,
david
On 20/01/2016 4:59 PM, Charles Steinmetz wrote:
david wrote:
It's a 2.2uF cap, with a 0.125" lead spacing, and I'm looking for
125dC temp rating. I wondered if there were other characteristics such
as ESR/ESL I need to keep in mind.
You're on the right track. Get the highest temperature rating available
(which is probably 125C), buy only caps manufactured by one of the
known-good manufacturers, and select from a parts series the
manufacturer designates as "high reliability" (or equivalent).
If it is a solid tantalum, I like the Vishay 199D Series. The AVX TAP
Series and the Kemet "T" Series ("UltraDip II") are also high quality.
(This list isn't exhaustive -- these are just the ones I've had occasion
to qualify.)
Best regards,
Charles
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