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New Kid On The Block
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Registered: 01-2012
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BV 131


since last weekend i am a proud owner of an BV131 ....works well ..i love the old fashion tube gear
But at a closer look i found an resistor that went black like [sign in to see URL] think its getting too hot :-))
its between tube socked and the relay
and in the schematic you find it paralel to the tube heatingwire--Log in or sign up to see linked image content--

picture is not from me but its the same

My question how important is this resistor
and how many Ohms does it have

tnx in advance and hope propagation is beter [sign in to see URL] 13FB176
21/Jan/2012, 11:30 am Link to this post Send Email to Spookyelektrik   Send PM to Spookyelektrik Blog
 
108FB360 Profile
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Freebander
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Registered: 11-2009
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Re: BV 131


Hi Mario

Looks like this resistor orange-red-black or
orange-red-brown or orange-red-violet really hard to tell, i would put a meter on it to see what it reads, (if anything). Orange-red-black is 32Ω,
orange-red-brown is 320Ω and orange-red violet is 320MΩ. Its really hard to tell with the heat damage, and if this one has burned out was this a sufficient value in the first place.
Does it not give you the value of the resistor on the underside of the board (just a thought)...BE VERY CAREFULL WITH YOUR REPLACEMENT


found this, hope it helps

[sign in to see URL]

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Rab 108FB360
21/Jan/2012, 10:12 pm Link to this post Send Email to 108FB360   Send PM to 108FB360
 
Spookyelektrik Profile
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New Kid On The Block
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Re: BV 131


Hello Rab

tnx for your quick answer and your partizipation mate
I was diging deeper and the problem is.
There are alot of versions out and even more schematics.
The older versions dont have this resistor only the newer versions
And thanks for the link but it shows a modified version using the cheaper pl519 instead of el519.

foud this picture and yep your right schematic shows 330 ohm so you close :-)
i think this is the schematic that fits to my amp
but i also measure the one and have a look on the capacitors to check its the right one.

[url][sign in to see URL]

its parale to the capacitor to ground so its a filter i guess.
if nothing helps i check the value of the paralel capacitor and do the math to get the same frequency

73s hope to hear you on air soon
mario 13FB176
22/Jan/2012, 11:03 am Link to this post Send Email to Spookyelektrik   Send PM to Spookyelektrik Blog
 
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Freebander
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Re: BV 131


Hi Mario

No problem mate, just hope you get on well

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Rab 108FB360
22/Jan/2012, 7:05 pm Link to this post Send Email to 108FB360   Send PM to 108FB360
 
permand Profile
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Re: BV 131


Hello there Spookeyelektrik !

I just saw your tread about the burned resistor to your Zetagi BV131.

I just got a used BV131 myself - and the same resistor in mine was burned - just like yours.

I my pa. it was a 310 Ohm resistor - I have changed it to a 330 Ohm 5W resistor - no problems.

I have made a little video of mine here:
[sign in to see URL]

The Meter is showing way to much - it gives about 80/90W at FM.

I love the old tube - and how hot it becomes :-)

I hope yours is working perfectly.

/Per
30/Jan/2012, 5:05 pm Link to this post Send Email to permand   Send PM to permand Blog
 


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