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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: sci.electronics.design
Subject: Re: hobby electronics
Date: Sun, 7 Jul 2024 16:57:41 +0100
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On 07/07/2024 00:01, Edward Rawde wrote:
> "Martin Brown" <'''newspam'''@nonad.co.uk> wrote in message news:v635o1$24goj$1@dont-email.me...
>> On 02/07/2024 17:28, john larkin wrote:
>>>

>>> Some of these guys blame surface mount, which seems wrong to me. There
>>> are lots of thru-hole parts and parts kits around.
>>
>> Surface mount has rendered modern kit all but impossible for the home user to repair. I cut my teeth mending transistor car radios
>> back when chassis earth was chosen randomly by each car manufacturer to be either positive or negative and people blew up their
>> brand new car radios.
>>
>> The other big earner was mending teenage wannabe rock stars amplifiers that had their output transistors fried or a pint of beer
>> in them.
> 
> Anyone remember SN76013N/023N.
> Horrible things, particularly when it must be your fault that the replacements (two for stereo) blew up again a few days after
> repair.

ISTR a remarkable number of 741s or 709s inside them and the odd SE540 
in the better ones. 2955/3055 output pairs - before power FETs took over.

-- 
Martin Brown