Here is a link for the AC-4 that also shows the way to check the
voltages.
http://www.wb4hfn.com/DRAKE/DrakeArticles/TechTips/
PowerSupplyTroubleshooting.htm
Al, n7ioh
On Mar 24, 2010, at 10:45 AM, Garey Barrell wrote:
Franco -
The AC-4 is rated for 120 / 240 @ 50 / 60 Hz.
You should check the output voltages from the supply to see if that
is the problem.
You should see about 740 VDC on the HV supply, 300 VDC on the LV
supply, ~ -50 to -100 VDC BIAS, and ~ 14VAC on the Filament line,
ALL NO LOAD. Shorting Pins 1 and 2 together on the power supply
connector will turn the supply ON to check these voltages.
**CAUTION** HIGH VOLTAGE!!!
If these voltages are indeed low, you can use a filament
transformer rated at ~ 3A to "boost" the primary voltage. A 12 VAC
@ 3A transformer will raise your voltage to 232, and a 24 VAC @ 3A
"control" transformer will raise it to 244 VAC.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
iz oos wrote:
Hello friends,
My AC-4 is wired for 240 VAC. However in Italy we have 220 VAC.
My T-4XB loads correctly as I see It draws about 0.3A or a bit more,
and I see about 90 Watts in the tune mode and about 110 Watts in CW
key-down (average power) on the 20 meters band.
I know that in USA a T-4XB is able to deliver 150Watts. The fact that
I can only use just 220 VAC might explain some power loss (like 10%
less)?
73,
Frank IZ2OOS
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