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Old 29th January 2013, 06:49 PM   #11
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Make sure to check the caps and zeners in that channel.

Is the amp blowing the fuses for that channel?

Like Perry has told me before you cant rely on DC with no outputs installed.

You are sure all transistors and drivers are installed in the correct locations?
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Old 29th January 2013, 07:18 PM   #12
shawnk is offline shawnk  United States
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Ok, using a 4ohm load the amp produces a clean sinwave all the way up to clipping (~27v) Adjusting the bias pot produced a nearly identical clipping point.

I adjusted the bias using the tip in the tutorial (by viewing my current meter inline with B+).

The interesting thing is by adjusting the bias to the point of minimal current increase I was able to achieve only ~ -.055v of offset for this channel. I know this isn't perfect, but as I had said before I'm at a loss trying to get it any better than this. Is this possibly due to the 2n6488/2n6491 substitutes?

Is there anything else I should look for? I still have another channel to go after this.
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Old 29th January 2013, 07:30 PM   #13
shawnk is offline shawnk  United States
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Quote:
Originally Posted by seankane View Post
Make sure to check the caps and zeners in that channel.

Is the amp blowing the fuses for that channel?

Like Perry has told me before you cant rely on DC with no outputs installed.

You are sure all transistors and drivers are installed in the correct locations?
Thanks for replying,


I've checked just about everything for this channel. Hell, I've even replaced practically everything in this channel as well. That's what's so fustrating

She's producing clean output up to clipping now... I guess the next test is for "long term" stability.
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Old 29th January 2013, 08:32 PM   #14
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I could send you a D40D8 and D41D8 if you think it would help.
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Old 29th January 2013, 09:34 PM   #15
shawnk is offline shawnk  United States
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Thanks for the offer bro... that's very nice of you! I'll see if she holds up ok and if not then I'll probably take you up on that offer (I'll pay of coarse)!
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Old 29th January 2013, 10:54 PM   #16
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I can just give you a couple, people have helped me out on the forum before so I would feel better about giving them to you and contributing a favor to another forum member as some people have done for me.
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Old 29th January 2013, 11:06 PM   #17
shawnk is offline shawnk  United States
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Well that's very generous of you bro. We'll see if I need them or not pretty soon here.

Can I ask how you came across these since they have been discontinued for so long?
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Old 29th January 2013, 11:10 PM   #18
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Struck up a deal with gentleman that I have done business with in the past and he sold me all his stock.

I only have like 20 of each, I am trying to work a deal with another gentleman to get his stock of 200 each.
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Old 29th January 2013, 11:14 PM   #19
shawnk is offline shawnk  United States
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Very cool.

Well, if you need someone to split and help with costs just let me know
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Old 29th January 2013, 11:29 PM   #20
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I have no problem with that, I dont need that many but want to get them because I am sure we will be repairing these amps for years to come and soon they just wont be available anymore.

There are subs but I like retaining the factory part and look after a repair ya know?
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