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Replacing tubes


lespaul678
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Thank you for your concern.  I appreciate it.  I do have the exact replacement tubes, but you did not answer my question.  You're supposed to bias an amp after replacing the tubes and I do not see the number in the user manual for what to set the bias to.  I need that number for the HD100 Valve, Spider, Bogner amp head.

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  • 4 months later...

That is for FX loop or separating out the pre and power stages as some people do. It's a typical feature in all kinds of amps

and even stereo system.

 

There's a digital board with patches and effects, that sends the audio signal to the tube amp board. The amp board sends a

signal back to the digital board. It keeps the signal from going out of wack and blowing something.

 

I can't get anymore specific and deeper than that.

 

 

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If I seem vague, it's because your getting into circuit level questions I can't get into with an end user.

Proprietary NDA stuff. Not allowed to get any deeper than I already have.

 

Need to use the specified tubes, or it runs the risk of ending up on my repair bench,... and I'm trying to avoid that.

Being a service tech here at Line 6, I speak from lots of experience with these amps here.

 

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40 minutes ago, psarkissian said:

I do know, I'm just not allowed to get into with someone other than a Line 6 authorized service tech.

Sorry.

 

 

No need to apologize for adhering to your NDA, imho. There are things you know that you can’t share publicly. Not difficult to understand.

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Yes, true.

Also don't want people probing in these amps, as they are touchy due to the hybrid analog/digital nature, and there is that high voltage hazard risk.

I imagine you've been zapped a number of times too.

 

It's not like our amp is in Aspen Pittman's tube amp book. He was a cool guy, founder of Groove Tube and a total tube amp nut. I miss him.

 

 

 

 

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20 hours ago, psarkissian said:

Seven amps,... very good.

 

 

I'm extremely happy with the results I get from the Helix>DT combination. I was late to the party so I started with the DT25 HD a few years ago and wanted to try its big brother so I ordered a refurbished DT50 HD from Line 6 (sadly the only one that doesn't work... something in it died). After that I just started acquiring them whenever I found a great deal (cheap and barely used) so now I have 3x DT50 HDs & 1x DT50112 and 2x DT25 HDs & 1x DT25 112. Also, 2x DT50 4X12 cabs which I love. I hope to keep these amps running for a long time (that is, unless L6 comes out with a new version... :-) ) I also own a PC+ 112 & 212, just because I may want to gig again someday and I've found they are gig friendlier. 

IMG_0583.jpg

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nice!  what a great look!  I also love the DT25.  I have two of them.  One bricked trying to upgrade to 2.0 to use with the helix.  I did change the tubes (correct tubes!) and set the bias a few times.  Very Very Carefully!

 

My problem was the DT25, at least in my case, was/is so fragile.  I bought a PC 112+ and used it this past weekend.  I am really happy with that for gigging.  It is much lighter and feels more sturdy.

 

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