[AMPS] AL-1200 Blower

[Brakob, Hans]

I don't want to shut off the tube, but rather pop the blower speed
up (or down) a notch.

73, Hans, K0HB

-----Original Message-----
From: Hans Goldschmidt [mailto:sm5ki@algonet.se]
Sent: Thursday, December 07, 2000 6:35 AM
To: w7ti@jps.net; Roger P
Cc: rakefet@rakefet.com; amps@contesting.com
Subject: Re: [AMPS] AL-1200 Blower

The K2RIW methode is better. In his by now famous 2 meter and 75cm paralell
4CX250B amplifiers he simply measured the air exaust temperature from the
chimneys. Calibration is done by comparing the anode current (ts) with air
temperature. Change the bias and make yourself a calibration curve. So in
external anode tubes tubes a temperature sensor could off the tube when max
anode dissipation occurs.Simple.


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