[R-390] Radio Shack Impedance Matching Transformer
Scott, Barry (Clyde B)
[email protected]
Tue, 23 Sep 2003 11:42:01 -0500
Bob,
I found this from an older post from Don Reaves.
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Radio Shack has these specifications listed for
that transformer on their web site. This must be
a sample of 5 units.
10 Watt 70 Volt Audio Transformer 320-1031 Specifications
320-1031) Specifications Faxback Doc. # 9663
Transformer
Dimension measurements are within specification.
Primary Impedance (at 400 Hz 5V):
Secondary Primary Watts
Loading Range No.1 No.2 No.3 No.4 No.5
4 Ohm 10 W 535 535 540 547 525
5 W 1025 1060 1040 1035 950
2.5 W 2020 2000 2105 2010 1900
1.25W 3905 4035 4050 4050 3850
0.62 7120 7365 7205 7200 6855
8 Ohm 10 W 570 595 585 590 595
5 W 1110 1115 1150 1130 1135
2.5 W 2050 2090 2245 2240 2240
1.25W 4205 4100 4150 4305 4100
0.62 7650 7400 7750 7605 7350
16 Ohm 10W 555 565 565 555 550
5 W 1070 1070 1090 1085 1020
2.5 W 2105 2100 2200 2190 2050
1.25 W 4070 4050 4100 4130 3960
0.62 W 7405 7395 7400 7410 7150
Primary Inductance: 7.5 H 7.2 H 7.4 H 7.4 H 7.3 H
Primary Resistance: 198 201 202 197 200
Secondary DC Resistance (Ohm): 0.888 0.892 0.886 0.898 0.917
Insulation Resistance:.............................100 Meg Min. at 500 VDC
Hi-Pot Test:..........................................1000 VAC 60 Hz for 1
minute without breakdown
Impregnation:..........................................Varnish Impregnated
Frequency Response........................................100 Hz to 10 kHz
Specifications are typical; individual units might vary. Specifications
are subject to change without notice.
(IR-04/12/95)
Don W5OR
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It appears you want to use the 10W tap but not sure. Hope this helps.
Barry(III) - N4BUQ
Okay, maybe I'm dense.
I picked up a few of those Cat# 32-1031 70 Volt 10 Watt PA System Line
Transformers.
First reason:
One of my R-390As was converted by its previous owner to an 8 ohm
audio output.
I want to use one of these outboard to take the 8 ohm to the 600 ohm
input to an Hallicrafter's R-42 Reproducer.
Can someone provide me with guidance to connect which tabs to connect
the line to the R-42?
It IS clear which to connect the 8 ohm input.
Thanks in advance!
Bob - N0DGN
--
< Bob Bethman - N0DGN
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