Nakamichi PA-7II: Thermofuse in the potted transformer - Page 3 - diyAudio
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Old 19th December 2010, 03:01 AM   #21
6L6 is online now 6L6  United States
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I have a CA-7. I would love to have a complete set like yours...
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Old 19th December 2010, 03:08 AM   #22
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Originally Posted by 6L6 View Post
I have a CA-7. I would love to have a complete set like yours...
Thanks. There's a certain look to the PA-7 that has always made me want one. I actually bought a really mint (and problem free) PA-5 a few weeks ago, but it just doesn't look as cool without the manly handles. I'm tempted to buy Nak tape deck just to complete the rack look, but I donated almost all of my cassette collection to the goodwill a few years ago.

On the Nak topic, check out this Dragon Turntable for sale (no affilication):

Nakamichi DRAGON-CT turntable Very RARE Orignal BOX on eBay.ca (item 300504326748 end time 19-Dec-10 21:27:10 EST)
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Old 19th December 2010, 04:09 AM   #23
6L6 is online now 6L6  United States
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Neat! I had no idea that Nak made a turntable.

As for a cassette deck? It's just not a hi-fi source. Even if the RX-505 is a cool deck...
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Old 20th December 2010, 08:45 PM   #24
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I've actually had great sucess accessing locations on a variety of potted items using a dremel tool with small pointed metalic die grinding wheel. First you will want to get the transformer x-rayed so you can pinpoint exactly where the thermal fuse is at. Then if it is actually easily accessable go to work at that exact location with the dremel. Be sure to have someone run a vaccum cleaner to gather up the dust... the dremel will go through the potting coumpound quickly and generate gobs of dust. The last thing I repaired was a potted AC line filter that was long ago obsolete. It had burn't off it's connection from the protruding lead inside under the potting material. I ground it away and repaired it in 30 min. time and put the NTSC genny back in service within an hour. I hope this might be of help to you on this. That is an amp that is worth saving even if you have to get a tranny wound for it...

Mark
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Old 21st December 2010, 04:22 AM   #25
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Originally Posted by p. jordan View Post
That's great! I have a Nakamichi PA-7, and a Bose 1801.
Both of these units get warm, and would like to know what
you use to measure the fin temperature.

Thanks,
Phil
Hi Phil, so for taking so long to answer your question:

I have Infrared Thermometer Gun that I just point and shoot to get an accurate temperature reading on any surface or component. It's laser sight and everything
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Old 21st December 2010, 04:26 AM   #26
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Originally Posted by Mark Allen View Post
I've actually had great sucess accessing locations on a variety of potted items using a dremel tool with small pointed metalic die grinding wheel. First you will want to get the transformer x-rayed so you can pinpoint exactly where the thermal fuse is at. Then if it is actually easily accessable go to work at that exact location with the dremel. Be sure to have someone run a vaccum cleaner to gather up the dust... the dremel will go through the potting coumpound quickly and generate gobs of dust. The last thing I repaired was a potted AC line filter that was long ago obsolete. It had burn't off it's connection from the protruding lead inside under the potting material. I ground it away and repaired it in 30 min. time and put the NTSC genny back in service within an hour. I hope this might be of help to you on this. That is an amp that is worth saving even if you have to get a tranny wound for it...

Mark
Thanks for the post Mark, your method sounds like the best way to approach this type of problem. I was fully prepared to get a custom transformer made if necessary, so I'm extra happy to get it running at no cost beyond a few hours of chiseling.
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Old 22nd December 2010, 09:56 AM   #27
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Originally Posted by electrafixion71 View Post
Hi Phil, so for taking so long to answer your question:

I have Infrared Thermometer Gun that I just point and shoot to get an accurate temperature reading on any surface or component. It's laser sight and everything
Thanks for the tip. Will get one soon!!
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Old 30th December 2014, 07:01 PM   #28
18000HP is offline 18000HP  Canada
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Thanks you Electrafixion71

With this thread and pictures i was able to fix the transformer on my Sony TA-N55ES .

It saved me a lot of research and $$$
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Old 1st January 2015, 10:25 AM   #29
AJT is offline AJT  Philippines
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japanese traffos with pins soldered into the pcb has the thermal fuse as a pair of pins, so that in case that fuse gives up, you can still bypass it with a right sized fuse...
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Old 2nd January 2015, 01:55 PM   #30
18000HP is offline 18000HP  Canada
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I really don't understand that if they have to buried the fuse deep in the middle of the transfo and then fill it with all that hard putty ... why would they not put a thermofuse that reset itself when it cools down
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