[Milsurplus] BC-474 and TBY

[Mike Feher]

Dave -

No, I did not, but, I am well aware of what you are talking about. I have
never used mine on CW, just AM. I built a power supply that fits, tightly,
into the battery compartment, so, all I have to do is plug it in. I had to
use DC on the filaments and totally isolate it from the rest of the
circuitry as I recall due to an excessive hum otherwise. I really like those
crude early sets, and the 474 sure fits into that category. 73 - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960




-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of David Stinson
Sent: Monday, March 29, 2010 7:20 PM
To: 'milsurplus'
Subject: [Milsurplus] BC-474 and TBY


----- Original Message ----- 
From: "Mike Feher" <n4fs at eozinc.com>
 
> More recently, using my BC-474 I worked up and down the east
> coast without problems and it was fun....

I had a blast with mine awhile back as well,
even making several contacts on AM.
Did you disconnect that B+ filter electrolytic 
that is before the TR switch contact, C-13?  Before I found that,
the discharge arc as I switched to TX was eating-up
the switch contact.  It is an obvious design flaw,
and I can't understand how the rig could have functioned
for very long without destroying the switch contact.
I just disconnected the cap and no more problem.

>... Hey, you bought that TBY from me and you been 
>boasting about your efforts since....
I have an original TBY (no number) I powered-up
a few years back and actually (yes; I confess)
got someone to talk to me on Chicken Band for a minute.
That was cool.  

You can see the later-war shortage of strategic metals
in the TBY series.  Put  a soldering iron to a connection
in a TBY-1 or -2 and the solder melts quickly and flows
smoothly.  Try it with a TBY-8, and you'll think you're
going to need a blow-torch.  They cut way back on the lead.

73 Dave S.