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Challenged myself restoring a Pioneer A-333. What dirty thing!
Challenged myself restoring a Pioneer A-333. What dirty thing!
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Old 20th September 2019, 10:11 PM   #11
MarsBravo is offline MarsBravo  Netherlands
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Holy water blessed the board.
What's the name of the ic?
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Old 20th September 2019, 10:46 PM   #12
jaycee is offline jaycee  United Kingdom
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Quote:
Originally Posted by StewartH83 View Post
Here's it cleaned up with resistors and some caps changed.

Theres no pots, does the ICs set the idle current?
Yes the IC sets the idle current.. this was a "non-switching" design Pioneer had during this era
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Old 20th September 2019, 10:47 PM   #13
StewartH83 is offline StewartH83  England
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Quote:
Originally Posted by MarsBravo View Post
Holy water blessed the board.
What's the name of the ic?
Hahaha yeah swept it with a bible too!

The ICs are PA0016.

The reason I bought it is because I have a A-400 in prestine condition that I will recap as its been in its box for 20 years. Saved up for it when I was 11 with paper round money ha. Thought this will be a good exercise beforehand. May even use it to pre-amp it yet IDK.
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Old 20th September 2019, 10:55 PM   #14
StewartH83 is offline StewartH83  England
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Quote:
Originally Posted by jaycee View Post
Yes the IC sets the idle current.. this was a "non-switching" design Pioneer had during this era
Great thing to do (in theory) I don't usually get stuff with ICs as I'm a basic and a bit old skool at the moments.

They just seem to be unreliable and the reason equipment gets dumped.
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Old 20th September 2019, 11:10 PM   #15
jaycee is offline jaycee  United Kingdom
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IC's dont fail any more or less than any other semiconductors do. The problem comes when they are custom parts that cant be substituted with anything else.
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Old 20th September 2019, 11:56 PM   #16
StewartH83 is offline StewartH83  England
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You have great guidance and advice, like others.

I've progressed a lot today in my learning and will keep a more open mind on ICs.

Can't thank you all enough
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Old 8th October 2019, 02:13 AM   #17
StewartH83 is offline StewartH83  England
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I finally changed the resistors that were looking worse for wear and about 10 others while I was in there which measured out of their tolerance with one leg out. The 4.7ohm resistors I was asking about measured high, about 5.6-5.7ohms.

With the new caps and resistors I really restored its sound as it was very noisy.

Also replaced its binding posts, just for the reason of accepting banana plugs.

I've got a Pioneer A300x in the post I bought for 33 off ebay. It looks mint except the bottom panel is rusted so I'll swap the panels around from this A333 as the faceplate is tatty on this and sell the A300x on after cleaning up.

Just wanted to update the post to say thank you very much for your guidance. We'll appreciate it
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