Garey and Group - In the 1960s I was a Test Engineer with Honeywell.
This was the days of their series 500 scopes with the ceramic terminal
strips and high impedance tube circuits. Dust and grim accumulation
build up inside was very noticeable and some times kept a scope from
calibration. A Tektronix field person sold the Cal Lab one of the
"dishwashers" and assisted in the first couple washes. Someone asked
as the first unit was washing if they have ever had a power transformer
fail. Answer was NO.
BTW - This first unit worked great and easily was calibrated, AFTER we
changed out the failed power transformer. :-) It did happen. Only
one I ever saw.....
73 Bob W7AVK
Garey Barrell wrote:
The most famous and referenced purveyor of the "Wash and Run" for
electronics is Tektronix. They used the procedure for many years, and
even had special "dishwashers" made to hold even the largest scopes.
What is NOT so widely discussed is that Tektronix in those days had a
lifetime warranty on power transformers, and very little mention is
made of how many were replaced after washing!! Unsealed transformers
and water do not do well together, be they power, IF, Audio output, or
...
Washing electronic gear is right up there with using abrasive or
chemical "cleaners" on rotary switch contacts, using Q-tips, brushes
or any other "tools." Aside from the damage done to the VERY thin
silver plating it's all too easy to snag a fixed contact and "spring"
it where it no longer makes reliable contact. I've seen far too many
radios scrapped because an irreplaceable switch wafer was damaged by
"cleaning".
I'll stick with John's method.
73, Garey - K4OAH
St Charles, IL
Drake 2-B, 4B& C-Line,& TR-4/C Service Supplement CDs
<www.k4oah.com>
john wrote:
At 06:58 PM 11/1/2009, Hulett, Russell wrote:
I've read about running a Drake through a dishwasher,
There's a lot to learn about a radio (Drake or otherwise) through the
careful manual cleaning with forceps and rags, qtips, and time.
Though I'm far the a world class technician, I've fixed more rigs by
observing carefully as part of a patient cleaning process, than I
have with a scope probe in my hand.
John K5MO
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