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Fazio Electric
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vk6zgo:

--- Quote from: rsjsouza on December 26, 2021, 04:57:13 pm ---
--- Quote from: bsfeechannel on December 26, 2021, 04:27:55 pm ---
--- Quote from: rsjsouza on December 26, 2021, 12:59:24 pm ---Despite some procedural no-nos here and there,

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Example?

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Sure. In one of her last videos (or perhaps the last), she was repairing an amp sitting upright with all vaccuum tubes fitted. Easily disastrous scenario if the amp topples and breaks them.

Also, in the same video she was soldering/desoldering parts on the sockets with the vacuum tubes fitted - the thermal stress of rapidly heating/cooling the socket pins is also propagated to the tube pins, which can create small leaks in the metal/glass junction and reduce the lifespan of the tube. This was a common alert on all the vacuum tube manuals I ever read.
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If so, it was the most neglected alert in the real world----nobody had the time to pull all the tubes when equipment was needed "yesterday"!
The thermal stress upon the pins using modern irons is also minimal compared to that from the irons we used back in the day.
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There are other minor things such as shotgun replacement of capacitors, etc. but these are more or less justified depending on the conditions.

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Experience, along with urgency of return to service  is usually the arbiter of whether such actions are necessary.
rsjsouza:
Surely these aspects would be much less relevant back then when professional repair was mainstream and vacuum tubes could be found anywhere, but you can't deny they will save you from big headaches especially in today's day and age. Also, the videos give the opposite impression of a "production line repair" - they are quite detailed and caring instead, thus the five seconds per tube removed is rarely an impediment.

I did a few non-professional repairs back in the 1980s and, apart from the manuals I had read, these were also rules backed by the experience of some of the TV technicians I knew and read about at the time - some of the vacuum tubes were already expensive back then (not the PL36s and PY88s, but especially the big PL509s or PY500s of the big 26'' TVs) and minimizing these risks was already wise.

Overall, as I said before, the videos are entertaining and useful and nobody (including me) is perfect but we all have to be open-minded to improve, even if we have been doing this for 40, 50 years.
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