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 Post subject: TA7205AP
PostPosted: Tue Apr 11, 2017 4:21 pm 
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Joined: Mon Dec 10, 2001 1:01 am
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When I heard that Toshiba Corp. was on the verge of bankruptcy, memories of my early days in electronics came back. I remember how a very early experience with component level electronics was repairing a car stereo amplifier with a blown TA7205AP IC chip. I went to the local car stereo shop and purchased the IC for $20.


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 Post subject: Re: TA7205AP
PostPosted: Wed Apr 12, 2017 9:10 pm 
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Joined: Thu Oct 26, 2006 7:11 pm
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Location: Maryland
And now....They are under $2 all over the net!
But
If they become discontinued, they will be up to $20+ from the scalpers!



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 Post subject: Re: TA7205AP
PostPosted: Thu Apr 20, 2017 5:18 pm 
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Back in those days, even with relatively high parts and labor costs, it was more worthwhile to repair consumer electronics. It could more likely be that I bought two of the TA7205AP ICs for $20 because there is a good chance that I didn't know if one or both of the originals​ in the amplifier were bad.

Earlier, I recall trips with my dad, to use a tube tester! I can't remember where we took TV tubes to in order to test them. I recall not too many years later testing tubes on my own, too.


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 Post subject: Re: TA7205AP
PostPosted: Thu Apr 20, 2017 7:52 pm 
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Hi Joseph,
Likely I would have run into you, or your dad, at the local drug store since many had tube testers with a zillion sockets and a big roll chart. Oh, don't forget to look at the 'troubleshooting guide', with the squiggly pictures that suggested what tubes may be at fault...Ah, the old days!



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 Post subject: Re: TA7205AP
PostPosted: Sun Apr 23, 2017 4:39 am 
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Hi Len,
I recall that troubleshooting guide now with those pictures of various faulty rasters!

http://tubedatabase.co/testers/hickok-533a


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 Post subject: Re: TA7205AP
PostPosted: Tue Apr 25, 2017 10:39 am 
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Location: San Jose CA
I don't recall ever seeing a tube tester in a drug store but most Radio Shacks had them up until at least the mid eighties maybe a bit later. Most towns had a TV repair shop too. At least we still fix our cars and our appliances.


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 Post subject: Re: TA7205AP
PostPosted: Tue Apr 25, 2017 12:18 pm 
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Yes, many local chain drug stores had these testers a lifetime ago. They were there to sell tubes so if the tube tested bad, it probably was, but if it tested good, well maybe it was not.
Many had a wheel chart showing various TV screen pictures and suggested tubes that may be associated with the problem, vertical, horizontal, snow, sound...

Here is a BIG link that shows many typical models.
https://www.google.com/search?q=drug+store+tube+tester&rlz=1C2JPGB_enUS607US607&tbm=isch&imgil=nzzui-k0xFxd3M%253A%253B8MpdiLwgpiK2QM%253Bhttps%25253A%25252F%25252Fnl.pinterest.com%25252Fpin%25252F148407750195806497%25252F&source=iu&pf=m&fir=nzzui-k0xFxd3M%253A%252C8MpdiLwgpiK2QM%252C_&usg=__WiVuVdCI5EihmOJGxxrnGwZxQ8g%3D&biw=1920&bih=946&ved=0ahUKEwjE-u3ktMDTAhWo7IMKHWLzBS0QyjcIOg&ei=8Kz_WMTCKajZjwTi5pfoAg#imgdii=wdvhXCxELMMhAM:&imgrc=nzzui-k0xFxd3M:

Ah.. Those were also the days of high voltage batteries for tube 'portable' radios. Does 6SN7, 5U4 or 1B3 ring a bell :smile:



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 Post subject: Re: TA7205AP
PostPosted: Tue Apr 25, 2017 5:41 pm 
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I remember the troubleshooting guide said what some of the different tubes were that could cause the example bad raster picture shown.
I was wondering why even though the tester I linked to looked familiar, it was lacking the display console that the ones in the store had.

The 6NS7 does sound familiar. I remember the 6L6 and 12AX7 also.


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 Post subject: Re: TA7205AP
PostPosted: Tue Apr 25, 2017 8:06 pm 
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I would have keep running into you, or your father, at the neighborhood medicate store since many had tube analyzers with a zillion attachments and a major move graph.

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 Post subject: Re: TA7205AP
PostPosted: Tue Jul 11, 2017 11:43 pm 

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What's more, now....They are under $2 everywhere throughout the net! In any case on the off chance that they wind up plainly suspended, they will be up to $20+ from the hawkers!

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