Archeology ..... or, the Holy Grail - Pass style!

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
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
 
Wisdom After The Event

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.
 
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
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.