[Hammarlund] HX-50 Capacitor Replacement (C-174/175)

Tue Sep 30 17:31:10 EDT 2014

     560 VDC is at the output of the rectifier. The filter 
cap will see both this voltage and ripple voltage at that 
point. Its common to have capacitance input filters with 
over sized capacitors.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com


----- Original Message ----- 
From: "Bill Stewart" <cwopr at embarqmail.com>
To: "Bernie Arcand" <barcand at nccray.com>
Cc: <hammarlund at mailman.qth.net>
Sent: Tuesday, September 30, 2014 11:57 AM
Subject: Re: [Hammarlund] HX-50 Capacitor Replacement 
(C-174/175)


> Hi Bernie,
> I will check with Tom. If he can do it, his price might
> not be too far from the price of HV axials needed to 
> replace
> the orig. cans.
>
> I noticed on the tube voltage chart that the highest DC
> voltage is 560vdc. I guess the 1200vdc cap spec gives some
> head room for the peak DC value. For testing, I may try
> using a couple of 47/450vdc axials. That will give me
> around 23mf @ 900vdc. That may work 'till I can get the
> proper values.
>
> Tnx for the comments...73, Bill K4JYS
>
> ----- Original Message -----
> From: "Bernie Arcand" <barcand at nccray.com>
> To: hammarlund at mailman.qth.net
> Sent: Tuesday, September 30, 2014 2:37:39 PM
> Subject: Re: [Hammarlund] HX-50 Capacitor Replacement 
> (C-174/175)
>
> Don't just go by what you see on Hayseed Hamfest's 
> page...e-mail Tom and
> tell him what you're needing and he will make a multi-can 
> up for you,
> complete with proper colored wires and identical mounting.
>
>
>
> On 9/30/2014 12:59 PM, Bill Stewart wrote:
>> GA all,
>> Here is some short background info on this project.
>> When I first started messing with BAs, around 1999 or 
>> 2000
>> I ran across this HX-50 at a hamfest. I couldn't walk 
>> away
>> from it...its one of the best looking rigs made, to me at 
>> least.
>> However when I got it home, I found the pwr xfmr was 
>> shorted.
>> A short time later I ran across another one...long story, 
>> short...I
>> acquired it and put its good xfmr in the orig, slightly 
>> better looking,
>> transmitter. At that time , having little experience in 
>> serious restoration
>> work (not much better now)...some problems arose with 
>> this
>> action and ever since it has been under the bench.
>>
>> During the Sep. CX, I worked a couple of HX-50 xmtrs 
>> which
>> renewed my interest in the project and have decided to 
>> try again
>> to get it going. So far I have done some cleaning and 
>> cked the xfmr
>> wiring, which is ok. Previously I had replaced the 
>> smaller 'lytics but
>> the can types remain. I have had the TO-6A on one of the 
>> 40/600
>> (C-175) caps for about 5 hrs now and its is pretty well 
>> hanging around
>> 420V @1.5ma...a long way from its 600vdc spec (higher 
>> than  420
>> volts runs the current up to near 10ma of leakage). I 
>> don't think
>> it will go any lower. So, looks like I am gonna need to 
>> replace the
>> remaining can caps. What leakage current should a good 
>> 40/600vdc
>> 'lytic have?
>>
>> I will need a total of 20mf @ 1200 vdc ea. to replace 
>> C-174/175.
>> I can hang a bunch of 'lytics, in series, under the 
>> chassis, but would
>> rather have a neater solution. Anyone know of a source of 
>> 40mf/600
>> vdc cans. I didn't see any on the Hayseed web page. Or, 
>> same value
>> in axial 'lytics. Anyone else had to replace the cans, 
>> esp the 40/600
>> ones? I'm still looking on the web for info, but 
>> comments/suggestions
>> will be appreciated.
>>
>> Tnx..73 de Bill K4JYS
>>
>>
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