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B&W Model 380B 1 KW, T/R Switch for Vintage Transmitters & Receivers

$34.99

B&W

B&W Model 380B 1 KW, T/R Switch for Vintage Transmitters & Receivers

$34.99
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$12.00 (Fixed shipping cost)
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Product Description

This B&W Model 380B  T/R Switch for Vintage Transmitters & Receivers, is in very good condition.

I powered it up on the bench and the tube lights up and everything looks okay inside.

I am selling it as is as described.

It would be prudent to change the electrolytic capacitors before putting it into service.

 

B&W 380B electronic TR switch Operates as follows.
You use a series UHF coax T-Connector mounted on the "Antenna" terminal 
of the TR switch.  One end of the T goes to the Transmitter, 
the other end to the antenna.  The "Receiver" terminal 
gets a coax line right to the receiver. 

It's also possible to use the TR switch between a separate 
receiver antenna and the receiver. 

I have no paperwork.  B&W advertised it as good for a KW A.M. 
on the HF bands. 

The 380B uses a single tube, type 6AH6 pentode. 
Mine required replacement of the two electrolytic 
capacitors in the power supply, and the 1K resistor 
from the power supply B+ to the tube. 

There's a large bifilar ***under the chassis for the 6AH6 
heater line, and a smaller ferrite rf transformer above 
the chassis feeding the receiver.  The 6AH6 rf amplifier 
circuit is untuned.  The 1.2 Meg grid resistor 
furnished cutoff bias when the transmitter is on. 

The coax length between the TR switch and the transmitter should be 
as short as possible, to minimize "suck out" effects - 
possibly desensitizing the receiver at certain settings 
of the final pi network. 

Also, the transmitter and/or amplifier should be biased 
to cutoff during receive, to minimize noise. 

 

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