Re: [Boatanchors] SB101 squeal

[Al Parker]

Hi all,
	I agree, it's not much more $, and it makes it look much more 
professional, use the heathkitshop kit.  Another similar source is 
  I don't know see one for the 
HP-23, but Jeff supplies similar kits for other applications.  I've used 
both, and they both provide excellent stuff, and will give support.


Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 7/9/2018 11:58 AM, GENE BALINSKI wrote:

Ray,

For the HP-23, buy this: https://www.theheathkitshop.com/page16/index.html 
HP-23 rebuild kit. I have use his kits for the Drake AC-4 supplies, and they 
work well. I will be ordering one for my HP-23

73

Gene K1NR


On July 8, 2018 at 11:07 AM RAY FRIESS  wrote:

but in the meantime, I'll have to scrounge through the shack to see if I can scrape together some filter caps and hope RaElco gets back in business soon. 

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Re: [Boatanchors] SB101 squeal

[GENE BALINSKI]

Ray,

For the HP-23, buy this: https://www.theheathkitshop.com/page16/index.html 
HP-23 rebuild kit. I have use his kits for the Drake AC-4 supplies, and they 
work well. I will be ordering one for my HP-23

73

Gene K1NR

> On July 8, 2018 at 11:07 AM RAY FRIESS  wrote:
>
>
> My thanks to all those who offered advice on the horrendous squeal when I 
> turned the audio gain up over a quarter of the way.
>
> It was, in fact, the bypass capacitor in the audio stage. Glen Zook 
> identified the exact one for me too. This morning about 1 a.m. because I 
> couldn't sleep, I opened up the 101 and replaced the capacitor. Fired up the 
> rig and no more squeal. The next fix moves to the HP23 power supply. Even 
> with the volume completely down, there is a noticable hum ... and we all know 
> what that hum is characteristic of. HI HI. So, filter caps in the power 
> supply are next.
> But after replacing the bypass ... I was greeted by the rush of a radio with 
> no antenna connected. I then crawled into bed and went to sleep. :)
>
> It could be a little while before the filter replacement is accomplished. We 
> have a parts store here in Salt Lake called Ra Elco. It is literally a heaven 
> for those who need parts at a reasonable price. It started out as a ham store 
> where us newbies would go to drool over the used gear and dream. Then it 
> changed to a Lafayette outlet, before finally transforming into a parts store 
> which would put even Radio Shack to shame. Anyhow, we turned on the news a 
> couple weeks ago, and watched the report and video of the store up in flames, 
> which started somehow overnight. About a third of the store was engulfed. The 
> owners vow they will recover and get back in business ... but in the 
> meantime, I'll have to scrounge through the shack to see if I can scrape 
> together some filter caps and hope RaElco gets back in business soon. You 
> could almost hear the groans of anguish from all the hams and repair shops in 
> the state and a couple nearby states too...
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Re: [Boatanchors] SB101 squeal

[Glen Zook via Boatanchors]

The cathode bypass being contained in a multi-section electrolytic "can" is 
very common.  Often there will be 2, or 3, sections with a voltage rating like 
350 VDC or 450 VDC and then a section with like a 25 VDC or 50 VDC rating.  The 
lower voltage capacitor is almost always used as a bypass capacitor and not as 
a filter capacitor. 

Glen, K9STH 
Website: http://k9sth.net

  From: Dale Parfitt 
 To: 'Glen Zook' ; 'RAY FRIESS' ; 
boatanchors@puck.nether.net 
 Sent: Sunday, July 8, 2018 3:23 PM
 Subject: RE: [Boatanchors] SB101 squeal
   
Hi Glenn et al,
Also on the Drake 2B (and likely the 2A). I seem to recall in those instances 
the cathode bypass cap is contained in a multisection electrolytic can. The 
other sections are used in the P.S. filtering.

   
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