[Hallicrafters] Off-net correspondence placed on-net.

[Waldo Magnuson]

Note:  Following is a correspondences between Skip Magnuson and
Al Parker.  I (Skip) broadcast for an 11-pin connector for my HT-37 
transmitter and
Al sent me one.  Read Al's note first.

Hi Al,
    On the HT-37 I replacing 1) All of the Black Beauties (3 I think) 
C89, C83,
C204. 2)  The two 20uf/600v paper caps C69, C80. 3) Two electrolytics 
near
the power transformer C 98, C99. 4) And the 40uf & 20 uf in the can (I'm
still trying to figure out how to get these in under the chassis).  At 
least those
are the ones I'm doing now.  I have to replace the power cord too as 
whoever
did it before did a poor job.
    On the rectifiers - do you just put the SS diodes across the proper 
pins and
pull the tube?  I see there is a HV rect. (5R4GY) and a LV rect. 
(5V4G).  Would
you recommend doing both?
    I do have a Bird Thruline wattmeter that was given to me some time 
ago.  Model 4370.
It has two frequency bandwidth positions 25-175 and 175-500 MHz.  
Forward
power appears to go from 10 to 500 watts and reflected 1 to 50 watts.  
I'm not
sure if it would be useful down to 7 MHz.   I would still need a dummy 
load and
maybe a 100 w light bulb would work.  I was thinking of building a 
dummy load with
non-inductive resistors in series & parallel.
Skip Magnuson KD7VRM

On Wednesday, October 8, 2003, at 11:39  AM, Al Parker wrote:

> Hi Skip,
>     Just curious, after the recent thread on HT-37 capacitor 
> replacements,
> which ones are you changing?
>     On a dummy load, for a cheapie, just use a 60w or 100w light bulb. 
>  It
> may not match 50 ohms, and does radiate, but it works - that HT-37
> probably had one hooked to it back in the '50-'60s ;-)  I used them 
> back
> then.  But, for a decent one Bird is one of the best, but not always
> cheap.  You can find the smaller 5-20w ones at 'fests for $10-20.  The
> 100w+ ones'll go for $75+.    You could take a look on ebay, or put 
> out a
> want on one of the BA reflectors.
>     If you haven't done it, you oughta go SS on the rectifiers to 
> reduce
> heat in the pwr xfmr.
> 73,
> Al