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Tue, 03/25/2014 - 09:29
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Problems with biasing my HD130

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dennis v
Posted on Thursday, May 04, 2006 - 12:25 pm:   
I have a mm HD130 212 with the transistor bias and
when I measured across 3.9 Ohms resistor I only got about 10mV as the highest value even though I put the bias pot in the highest
position(giving highest bias).
The amp works but I'm a litte bit worried about the bias configuration.
Do anyone know if its a problem?
Terry
Posted on Friday, May 05, 2006 - 11:08 am:   
Could be bad tubes or bad 2N6488.
dennis v
Posted on Wednesday, May 10, 2006 - 04:21 am:   
So the 2N6488 are the same as JE1692 in the schematics?
And how can i check if its bad or broken?
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