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Message to Katie Wasserman: thanks!



#2

Through the valuable article by Katie I was able to resurrect an HP-27. Thanks to a small resistor 32 kOhm, this little beauty can fully be together with other woodstock in the collection of an avid collector.
Many thanks again and regards from Italy.

Ignazio


#3

Please share with us Katie's work.


#4

Of course, hpnut.
I was trying to repair the hp-27 of my dear friend. No display but good tensions from the DC-DC inverter and a current drain of 110 mA.
How you can read in the article of Katie about the issues of Woodstock's series calculator, I have cut the SYNC trace from the ACT to the rest of the calculator and insert one resistor (32KOhm, 1/4W, 5%) that has resurrected the little beauty, so far. My first attempt has been with a 20 KOhm resistor but with value of resistor the 27 needed 3 or 4 minuts to warm up properly.
It's all, I'll be available for any further information.

Regards from Italy.

Ignazio


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