Problems with biasing my HD130 Log Out | Topics | Search
Moderators | Edit Profile

Music Man Amps Discussion Forum » Adjustments, Maintenance & Calibration » Problems with biasing my HD130 « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

dennis v
Posted on Thursday, May 04, 2006 - 02:25 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?
Top of pagePrevious messageNext messageBottom of page Link to this message

Terry
Posted on Friday, May 05, 2006 - 01:08 pm:   
Could be bad tubes or bad 2N6488.
Top of pagePrevious messageNext messageBottom of page Link to this message

dennis v
Posted on Wednesday, May 10, 2006 - 06:21 am:   
So the 2N6488 are the same as JE1692 in the schematics?
And how can i check if its bad or broken?

Add Your Message Here
Posting is currently disabled in this topic. Contact your discussion moderator for more information.

Topics | Last Day | Last Week | Tree View | Search | Help/Instructions | Program Credits Administration