| Archeology ..... or, the Holy Grail - Pass style! - Click HERE for Original Thread |
| ergo |
"Wear safety glasses...." as Nelson also points in his ZEN articles : )
This one looks like it has been gathering dust for some time and I wouldn't much trust the electrolytics. They might "let out some steam" or literally explode.
I once blew up a much smaller cap, but what a BOOM.
Ergo |
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| skaara |
| Do you still have the schematic? |
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| Peter Daniel |
I blew a cap once too in 1980. I carry an artificial lens in my eye since then.;)
Whenever I run any project for a first time now I always wear glasses.:cool: |
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| Nelson Pass |
My experience with the big cans is that the vent plug
blows (watch out for that!) and an ultrasonic whistle
occurs which could deafen you, at least temporarily.
:bigeyes: |
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| skaara |
| Once I used an old cap, it was dry but I didnt know it was, and i pug it in... BAM!! I was looking like a chicken with all that paper (or something similar..) from the cap on me and it was on the walls, now iam using all new caps, except for the ones I know how old are they... |
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| mefinnis |
Thanks for the general concern ;)
I will not just "flick the switch" .... I've been around a little longer than that!
No, we will sneak-up slowly on the unsuspecting beast with a variac ..... plus safety goggles and ear plugs !!!!
Schematic ?
http://www.passdiy.com/pdf/classa_amp.pdf
Colleting dust ???
Nope ... rats pooh !!
But in the end ..... it's all good fun.
Regards, Mark |
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| mrfeedback |
Mark, there was discussion here recently about running up old gear on a variac in short stages over a few days to allow electros to reform safely, elsewise you are risking high leakage currents causing internal heating and gas pressure and explosion.
http://www.vmars.org.uk/capacitor_reforming.htm might help.
Modern electros have a y shaped weakness on the top of the can and this allows these caps to expire gracefully.
Electros with smooth tops can be dangerous, as Peter can testify.
Over the years I have installed caps in reverse and caused cap explosions.
The can really does come off at bullet speed and if it hits a hard surface will mushroom or flatten - I nowadays habitually stand back with my head turned away at switch on - so far I have not been hit but I have had some really close shaves in the past.
Sorry to hear about you learning the hard way Peter, and your advice of safety glasses is good advice.
Eric. |
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| jh6you |
Boom!!!
I finished wiring. Turned on. Wow…what a nice sound!
Heck…? whenever I stepped up and down the attenuator
for the volume control, I heard the sound, “click!…click!…”
It was funny and strange. It was a new thing.
To fix the trouble, I looked over into the launched Zen V2,
for a close inspection of details of wiring arrangement,
without wearing the safety goggles.
Then, suddenly all happened!
A poor man was lazy in checking the correct polarities
of + and – of the output coupling capacitor.
I however comfort myself.
Even Mr Nelson P…hahaha. Even the artificial-lens-eye Pet…D…hahaha.
JH |
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| mrfeedback |
Nelson, I can't hear those ultrasonic whistles anymore. :D
Eric. |
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| jh6you |
Continued from the above.
Life of Archetypal DIYer
My wife was happy when she heard "Boom!"
She was somewhat disappointed when she saw me alive.
JH |
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