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Swan 117B Stand alone Power Supply for Swan 400 and others (no internal Speaker) S/N K131402

$124.99

Swan 117B Stand alone Power Supply for Swan 400 and others (no internal Speaker) S/N K131402

$124.99
Condition:
Used
Shipping:
$30.00 (Fixed shipping cost)
For International Shipping, Please contact me for a Quote before check out
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Product Description

This Swan 117B Stand alone Power Supply for Swan 400 and others (no internal Speaker) S/N K131402

  It is  S/N K131402.

This one is in excellent condition and has been tested with a High Power transceiver and it worked with no apparent problems.  As with most Vintage power supplies, it would be prudent to replace the original electrolytic capacitors before putting it in to continuous service.

 The Cabinet is in great shape as is the front panels.

While it has limited use with the Swan Line up, It is a great stand alone power supply that can be used in place of many power supplies for other vintage gear as the voltages (listed below) are commonly used.

 Power Supply Model Output Voltage 

117B Line volts AC: 124 V, High Voltage: 881.8, medium vvltage: 272.4 V, Bias Voltage:  -109.7, REL v,  17.3 v, Fil VAC  13.1V

I am selling this Power supply as is as described for the family of a silent key.

 

 

 

Read all about it!

117B
The 117B is the second ac model power supply produced by Swan (replacing the 117AC) and the first that is directly
compatible with all post-240 Swan tube transceivers. While Swan vastly improved its construction quality
from the 117AC, they apparently had a power supply design identity crisis when they designed this one. Its
form-factor and styling radically departs from the 117AC model that preceded it and from the 117C and later
models that followed it, and most significantly, it in no way matches the styling of the contemporary transceiver
models (e.g. 400, 350). It is a totally enclosed rectangular box with a ventilation grid covering the upper portion,
is physically larger (and much more rectangular, with dimensions of 5" wide by 6" high by 15" long) than the
more compact 117C that replaced it, and it has the voltage output cable directly affixed to the unit midway along
the bottom of the long side of the chassis. The upper 2/3rd grid portion is painted black and the lower chassis
portion is gray.
There were two versions of the 117B, with some minor component changes between the two. Comparison with that of one version of the 117B shows it
to be identical except that: (1) there is no neon indicator light, (2) there is no speaker or headphone jack (or associated
wiring), and (3) a 0.5-μF, 600-V capacitor is added in parallel with the first choke in the MV filter. As
revealed by a comparison of the schematics shown in Fig. 3-5 and Fig. 3-6, there were significant circuit changes
from the 117AC to the 117B, primarily in the MV filter design.


Like the 117AC, it also differs from the later, more common 117X in that it derives the MV from a center tap on
the transformer’s HV secondary, as opposed to the separate secondary winding used in the 117X. In addition, as
with the 117AC, the nominal 800 V is derived from a single winding, rather than from the series connection of
the 600-V (HV) and 275-V (MV) rectifiers, as is done in the 117X power supply. A comparison between the
schematics shown in Figs. 3-5, 3-6, and 3-7 depicts this transformer difference.
If this power supply is used with one of the earlier transceiver models (i.e. 240 or earlier), the bias supply voltage
will be too high and it needs to be reduced with the simple modification (in-series voltage dropping resistor) to
the bias output circuit. The relay series resistor is also too low and should be changed from 4.7 Ω to 15 Ω. 

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