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 Post subject: Unknown Nagra mixer component
PostPosted: Sep Thu 11, 2014 8:14 pm 
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Joined: Sep Thu 11, 2014 7:56 pm
Posts: 3
Hi Y'all,
I'm recaping a nagra BmII mixer, and am in a bind.
There's a multi colored component that I don't recognize, and am in need of assistance.
The schematic reads R82k* (values modified for bmt with microphone transformer).
It reads 1nf on the multimeter.
I would really appreciate any input
Best regards

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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Thu 11, 2014 8:18 pm 
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Joined: Apr Wed 09, 2008 3:37 am
Posts: 12669
Location: Little Rock, Arkansas
R stands for resistor. Looks like an 82K ohm resistor. I've never seen one like this.


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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Thu 11, 2014 10:19 pm 
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Joined: Sep Thu 11, 2014 7:56 pm
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Hi Larry,
I thought it to be a resistor, but I can't get a resistance measurement on it.
This is as germanium mixer (oc 44)
regards
Tony.


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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Thu 11, 2014 11:58 pm 
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Joined: Aug Thu 27, 2009 7:47 am
Posts: 2665
Location: Seattle 98125
Looks more like one of those specialty tempco capacitors to me...but the capacitance reading of 1 nF doesn't square with the color bands.


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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Fri 12, 2014 1:25 am 
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Joined: Sep Fri 07, 2007 2:21 am
Posts: 1709
Location: Brunswick, ME 04011 (USA)
...that is a capacitor. Bands read out to 47; either 47pF (if it's ceramic) or 47µF (if it's tantalum; there should also be a polarity dot on it)...I've seen tantalum caps in Euro transistor radios that look similar to this...


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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Fri 12, 2014 1:51 am 
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Joined: Mar Mon 17, 2008 5:05 am
Posts: 5311
Location: Ashhurst, New Zealand
Yup, 47pF capacitor. Common as muck in Europe. Nagra - Swiss aren't they? Lovely little tape decks.

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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Fri 12, 2014 9:28 pm 
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Joined: Feb Sat 16, 2013 12:23 pm
Posts: 189
Location: Cape Town RSA
A similar device in one of my Nagra rell to reel decks also had me fooled.

In the same deck (a mono Nagra 4.2), there was a part looking just like a resistor and had me stumped when I couldn't measure anything. It was a fuse.

dauphine

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If you don't like my principles, I have many others - Groucho Marx


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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Sat 13, 2014 10:50 am 
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Joined: Sep Thu 11, 2014 7:56 pm
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It turns out that my fluke does not measure down to pf, so no doubt this is a ceramic 47pf cap.
Not sure if changing to metal film will incur any improvement, we'll see.
Thank you every one for your help!
It's highly appreciated
Tony.


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 Post subject: Re: Unknown Nagra mixer component
PostPosted: Sep Sun 14, 2014 1:41 am 
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Location: Ashhurst, New Zealand
IMHO it's probably not faulty.

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