From: Eric Webner 
Subject: [drakelist] Re: [drake-radio-operators] Overvoltage powersupply


Eric Webner  made an utterence to the drakelist gang
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Don't know if this will help you out, but I just measured the voltages
coming out of my stock AC-4 power supply (NOT connected to the radio):
 
Hi Voltage: 698 volts
Low Voltage: 268 volts
Bias Voltage: -54 volts
 
Your power supply may be ok, but the voltages are a little high. Maybe
someone more knowledgeable will respond.
 
Good luck,
 
Eric KA8FAN


ashsama3  wrote:

Hi, I recently aquired a T-4XC with an AC-4 powersupply, it's not a
Drake original AC-4 but built by the swedish Drake importer at the 
time.
I've replaced the caps and diodes, measuring the voltages I get this 
result.

The +650V is around +900V,
250V is 310V, negative bias is pot adjustable between
-50V and -100V, filament voltage is 13.5VAC.
This is not at high load but idle (not transmitting)
I haven't dared having it hooked up for more than 5secs
at a time, afraid that I will burn something.
Are these voltages out of the question to use with the radio, 
will something fry? Or would the voltage drop
during transmission to an acceptable value?

Regards Greg





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--0-1157009063-1107101693=:55831
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Don't know if this will help you out, but I just measured the
voltages coming out of my stock AC-4 power supply (NOT connected to the
radio):
 
Hi Voltage: 698 volts
Low Voltage: 268 volts
Bias Voltage: -54 volts
 
Your power supply may be ok, but the voltages are a little high.
Maybe someone more knowledgeable will respond.
 
Good luck,
 
Eric KA8FAN
ashsama3
<ash_5{at}gravitywell.org>
wrote:
Hi, I
recently aquired a T-4XC with an AC-4 powersupply, it's not
aDrake original AC-4 but built by the swedish Drake importer at
the time.I've replaced the caps and diodes, measuring
the voltages I get this result.The +650V is
around +900V,250V is 310V, negative bias is pot adjustable
between-50V and -100V, filament voltage is 13.5VAC.This
is not at high load but idle (not transmitting)I haven't dared
having it hooked up for more than 5secsat a time, afraid that I
will burn something.Are these voltages out of the question to use
with the radio, will something fry? Or would the voltage
dropduring transmission to an acceptable
value?Regards
Greg

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