Help me Identify some Components

GroupDIY Audio Forum

Help Support GroupDIY Audio Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

cannikin

Well-known member
Joined
Feb 8, 2005
Messages
1,009
Location
Seattle Washington
I'm in the process of recapping my board, and I'm there are some components on the input channels that I've never seen/used when building gear (yet). I was wondering if anyone could identify them and tell what purpose they serve.

Thanks

Component in question #1:
pic1.jpg

pic2.jpg


Component in question #2:
pic3.jpg

I know this is a Capacitor by SAFCO - But what kind of Cap is it? does it have polarity?

Component in question #3:
pic4.jpg

pic4.1.jpg

There's bunch of these on the pcb; with different values like 330H,33J,18F. What does that mean?

Component in question #4:
pic5.jpg

pic5.1.jpg


thanks!
:grin: :cool:
 
Component #3 is a polystyrene cap. Low tempco (stable w.r.t. temperature) material. #4 looks like some kind of film stack cap. Not sure about the others.

Analog Packrat
 
do you have a schemo of your raindirk?
Looking at the first one looks like a small trafo maybe a custom?

number 2 a cap: looks like it is 4.7 micro farads, axial, I am not sure if it is polorized. check for a + sign on it. I remember Jacob saying something about one leg being longer but I forgot off hand.

Number 3 is cap as well

A number code is often used on small capacitors where printing is difficult: 1nF capacitor

* the 1st number is the 1st digit,
* the 2nd number is the 2nd digit,
* the 3rd number is the number of zeros to give the capacitance in pF.
* Ignore any letters - they just indicate tolerance and voltage rating.

so in you case your 330H is a 33 nano farad capicitor


AS for number 4 could be a resister but not sure. hope that helps some...
 
component number one looks like an inductor to me, is it located in the EQ section of the channel? The rest are capacitors.

dave
 
> a Capacitor by SAFCO - But what kind of Cap is it? does it have polarity?

4.7uFd 40V at that size is certainly an electrolytic, and probably polarized. Which way? The RED end is your clue.

The inductors never fail, ignore them.

The mica caps never fail. Polystyrene caps only fail when you solder on them: I suggest leaving them alone. Both are excellent quality.
 
For what its worth, here's what I would say:
#1: Tapped inductors
#2: Polarized cap, possibly tantalum, red is probably +
#3: Film caps, probably polystyrene as AnalogPackrat suggests
#4: Definitely stacked film capacitor.

Be careful if you solder on #4, you can ruin those easily!

HTH!

*** PRR types faster than me, but I'd bet he uses more fingers!!
 
Thanks everyone that was the information I needed. I'm only replacing the electrolytic Caps, but i had no idea what the components above are.

I decided to bite the bullet/take a hit in the wallet and use Black Gates/Nichons. (I'm only doing 2 channels at a time though).

One more question: Do small signal transistors fail? things like BC182B or 2N5172... just curious, I've heard different answers to that question.
 
I would be so bold as to say that anything active will eventually fail. I think you'd know if a transistor was dead though.

dave
 
Or in the true spirit of DIY - ask the (probable) designer! - Cyril Jones
[email protected]

He lives up the road from me - I have emailed him a few times as he has loads of spare bits for sale (VU meters etc...) - and he gave me his phone number should I ever need to call!
 
1: is an inductor for sure, can't tell what the specs are by looking at them though..
2: Is a "WET" tantalum cap. polarity is indicated by the colors.
3: Is a polystyrene cap.
4: agreed that it is a stacked film cap of some kind.. but unsure of what kind. what does it say on the side?
 
[quote author="uk03878"]Or in the true spirit of DIY - ask the (probable) designer! - Cyril Jones
[email protected]

He lives up the road from me - I have emailed him a few times as he has loads of spare bits for sale (VU meters etc...) - and he gave me his phone number should I ever need to call![/quote]

I've been talking to cyril regularly over the past 6 months, such a nice guy. Very Helpful, he has given me a bunch of information and he currently creating a OpAmp replacement pcb, because the Chips used in the old raindirks are no longer made. When I first contacted him, he was so happy to see my board.. he said "I wrote that serial number on your board in 1975". Great guy.
 
#1 is inductive for sure but it has many wires, some kind of transformer?

#4 stacked film, Siemens now Epcos? Type MKT

http://www.epcos.com/inf/20/20/db/fc_01/02830318.pdf

If something is old concentrate on following thing:

Bad solder joints, bad sockets
Dry electrolythics
Bad pots

and last semiconductors. This is valid if the elctronics has run rather cool and not too humid environment.
 

Latest posts

Back
Top