[NJARC] Voltage Drop, Ham Radio...

[John Ruccolo]

Hi Scott,

What model # is that Dow-Key relay?? What tube does it use? You may be able to pull power from the transmitter instead.

Also, you need a decent high-impedance mike. That crystal mike you had was dead....that often happens with old crystal mikes. A D-104 would be good -- didn't you say you had one of those? Of course, it could be dead too. See what the HT-37 manual recommends.

Last but not least, that 60/40 475V can was running a little warm. Not hot, but a little warm. I recommend replacing those caps -- use it at your own risk!

I can hear my HT-37 whispering to me from the garage....fix me....

And *please* be careful around those unshielded 6146's....*lotta* juice there. ;-)


JR



--- On Mon, 7/27/09, Scott Roberts <ng19delta at yahoo.com> wrote:

> From: Scott Roberts <ng19delta at yahoo.com>
> Subject: [NJARC] Voltage Drop, Ham Radio...
> To: "NJARC Radio Club" <njarc at mailman.qth.net>
> Date: Monday, July 27, 2009, 1:10 PM
> Just remember 
> Reply = Poster
> Reply All = Everyone
> 
> _________________________________________________________
> 
> Well, I am very close to getting my Hallicrafters HT-37 on
> the air. Great Thanks to John Ruccolo for getting together
> with me after the swapmeet Saturday at InfoAge(Great
> Swapmeet!) and going through the HT-37. We got it to a
> decent point where it was showing great signs of life,
> especially after some tube replacement(Thanks to Al Klase
> for locating a few tubes for us)
> 
> It now looks like I should be on HF this week.
> 
> Voltage Dropping Question- In order to use the HF sets, I
> need to get my vacuum tube Dow-Key powered. It takes
> 90-120VDC & 6VDC. I would like to pull the power from
> the receiver- it has a 150VDC available, and so i need to
> know how to drop it to 110-120 or so... I know I can add a
> couple power resistors, but not sure how much. Can anyone
> give me any ideas? 
> 
> I am still lousy at these calculations still... On of these
> days!
> 
> Thanks!
> Scott
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