Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Frank -
I don't have specific current ratings for the transformer itself, but we
can come pretty close.
Red/Red - 266 VAC - 2.8 ohms - 740 VDC NO LOAD, 650VDC Full Load
TR-4(any) = ( 300 mA continuous, 500 mA maximum)
T-4X(any) = ( 200 mA continuous, 350 mA maximum)
Yel/Yel - 108 VAC - 6.5 ohms - 300 VDC No Load, 250 VDC Full Load
TR-4(any) = ( 200 mA continuous )
T-4X(any) = (120 mA continuous )
Blu/Blu - 98 VAC - 6 ohms - Adjustable -50 to -100 VDC No Load ( 2 mA
continuous )
Grn/Grn - 14 VAC - 0.2 ohms - (12.6 VAC )
TR-4(any) = ( 5.5 A continuous )
T-4X(any) = ( 3 A continuous )
Primary Voltage for all readings 121.5 VAC @ 60 Hz
Both HV supplies are Full Wave Voltage Doublers, so the transformer
should be rated for twice the DC output current required, i.e., 600 mA
or 1 A for the 266 VAC winding for the TR-4(any).
The transformer primary DC resistance is 0.4 ohms. The DC resistance
of the windings is a pretty good indicator of the current handling
capability of a transformer. For example, if you find a transformer
with a 260 VAC winding and it's DC resistance is 3 ohms or less, it will
probably be sufficient. Obviously the amount of iron core in the
transformer is also a limiting factor, but typically if the winding DC
resistance is low (on HV windings) there will be enough iron to support it.
Hope this helps!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
Radio Vintage wrote:
Hallo
Which are the characteristics in_* Volt and Ampers*_ of the
transformer of power source of the :
_*AC4*_
Red - Red
Yellow - Yellow
Blue - Blue
Filament
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