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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 5:11 am 
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Joined: Aug Sat 27, 2011 1:59 am
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Location: Kansas City area
Received the radio this afternoon. Even came with new batteries.

It's all done. About an hour on the operating table. 10 e-caps replaced. Started out with nothing more than a steady 'hiss'. Progressed to full rich fidelity and excellent sensitivity after the job was done. I checked operation as I went along and it kept improving steadily after each cap was replaced.

I'll check the old caps on the ESR meter tomorrow and report back.

Brian


Attachments:
File comment: Received the radio today:
Channel Master 6515 edit.jpg
Channel Master 6515 edit.jpg [ 130.4 KiB | Viewed 309 times ]
File comment: Opened it up. 10 electrolytics to replace:
IMG_6598 edit.jpg
IMG_6598 edit.jpg [ 125.34 KiB | Viewed 309 times ]
File comment: All finished. Sounds great!
IMG_6607 edit.jpg
IMG_6607 edit.jpg [ 128.66 KiB | Viewed 309 times ]


Last edited by Blast on Apr Thu 04, 2019 3:24 pm, edited 1 time in total.
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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 6:22 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: SoCal, 91387
Good job!

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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 3:14 pm 
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Thumbs Up!

Most of those caps are no doubt dried out due to case cracking or epoxy seal failing.

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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 4:45 pm 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Ed Morris did a fantastic job some years back, by restuffing all the original Sanyo capacitors in one of his radios. Unfortunately his images are no longer available!
Image
:) Greg.


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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 5:06 pm 
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Location: Kansas City area
Thanks fifties, Tom!

Greg, I likely ran across some of those posts as I was researching this repair. There were many from years back with broken image links. :cry:

Working on old cap testing as I type this...

Brian


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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 5:15 pm 
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Location: Mountains of Mourne. Ireland.
I think Ed drilled them out with a flat bottom drill-bit. I have a few of those Channel Master radios and also some of the Sanyo versions... but, they are all happily running on their original caps... go figure!

:) Greg.


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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 6:39 pm 
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Location: Kansas City area
Yes, they are nice little potted type caps that would lend themselves well to 'restuffing'. Me? I wouldn't have the patience for it, though. :)


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IMG_6627 edit.jpg
IMG_6627 edit.jpg [ 87.4 KiB | Viewed 274 times ]
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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 8:07 pm 
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Location: Kansas City area
I tested the original capacitors removed and the replacement capacitors with the three different testers that I had available. Here's the results of the tests:


Attachments:
Capacitor Testing2.jpg
Capacitor Testing2.jpg [ 161.63 KiB | Viewed 138 times ]


Last edited by Blast on Apr Wed 24, 2019 4:01 am, edited 1 time in total.
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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 8:19 pm 
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I'm sorry; we need something more thorough than that.

:wink:

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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 9:29 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Jackson, TN
Blast,
Great Channel Master and a thorough recap.

I wonder if we can get a summary report then follow up with a redacted full version. OK I admit that was uncalled for.

Seriously, the greatest challenge I had with recapping old transistor radios was keeping polarities correct since the polarity marking conventions of that time were inconsistent. I've had some marked at positive lead, others negative, and others not at all. To add to the confusion is the typical positive ground used with the PNP transistors.

Tim


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 Post subject: Re: Channel master 6515
PostPosted: Apr Thu 04, 2019 11:10 pm 
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Location: Kansas City area
fifties wrote:
I'm sorry; we need something more thorough than that. :wink:

:lol:
Tkilboy wrote:
I wonder if we can get a summary report then follow up with a redacted full version.

There was NO collusion with Panasonic! :)
Tkilboy wrote:
...keeping polarities correct...

Yes, and that's why i do my best to find a schematic to whatever I'm working on before I start. It helps me to understand the circuit which helps me minimize errors. And, since the dawn of digital photography I take a LOT of photos of what I'm working on, as well.

I really haven't done any serious DX'ing on this yet but I was pulling in Topeka (60 mi.) and Nashville (550 mi) stations with ease last night and today. And, it may not be the BEST fidelity I've ever heard in similar sized radios... but the audio quality IS top notch!

Brian


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 Post subject: Re: Channel master 6515
PostPosted: Apr Fri 05, 2019 1:32 am 
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I've never owned a ESR meter, reversing polarity while using a analog meter has always been enough for me. If cap has at least some capacatance, needle will jump to swing depending on value. No movement equal open cap.

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 Post subject: Re: Channel master 6515
PostPosted: Apr Fri 05, 2019 1:57 am 
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Nor had I. At least, until I saw Alan Wolke's ESR meter video: https://www.youtube.com/watch?v=bmYAgat-sOQ&t=170s

The project looked so interesting and I had most of the components laying around (including a millivolt HVAC repair meter that I knew I would never use for its intended purpose) so I just decided one day to whip one up.


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