HR-10 worthwhile mods

[Bill Coleman]

On Feb 7, 2006, at 8:39 PM, Allen Jones wrote:

> My latest project is an HR-10 which has been sitting
> in a closet for several years.  It seems to work well
> but I need to restring the dial.
>
> Any suggestions for worthwhile mods that don't require
> hole drilling?  I believe adding voltage regulation to
> the HFO is advised.

There were a bunch of mods listed in a 73 magazine article. I think  
it was the February 1972 issue, maybe it was November 1972. Can't  
remember.

If I can remember the mods, it consisted of replacing the 6X4 with  
silicon rectifiers, an improved audio-derived AGC system using  
silicon diodes, 0A2 regulation of the BFO and HFO. It did require one  
hole to be drilled in the chassis to accomodate the 0A2.

I made these mods back in 1975, when I had an HR-10B. The AGC was a  
vast improvement, and stability was much improved with the 0A2.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html