Hi Ken,
I have some ideas about your DC offset. The last thing you should ever do is remove the outputs and start testing them. These tend to go short drain-gate, taking some resistors and zeners with them. You can't mistake that.
I'm glad the show went well for you. I am still trying to get things under control here. I am only getting about 5 hours sleep per night. I need a solid eight. There is a possible correction in sight. BTW, I have a new (to me) distortion analyzer on my bench. 😉 😀 😀 😀
-Chris
I have some ideas about your DC offset. The last thing you should ever do is remove the outputs and start testing them. These tend to go short drain-gate, taking some resistors and zeners with them. You can't mistake that.
I'm glad the show went well for you. I am still trying to get things under control here. I am only getting about 5 hours sleep per night. I need a solid eight. There is a possible correction in sight. BTW, I have a new (to me) distortion analyzer on my bench. 😉 😀 😀 😀
-Chris
anatech said:
In my view Solid Sleep must be atleast 12 hrs continuous in an unknown Place...
Not probably with Poobah
[I think he is hibernating somewhere unknown]
😀 😀 😉
anatech said:
Yes..I was looking at the other Punterpoint thread (I think it has bias and offset issues as well - an SA-100 thread). I started checking all the different 'test points', in the Mikey supplied list/'schematics'
🙄 (Ah, Mikey's OK. We can all do better, and sometimes do. I mean, did I ever make it as far as he has with amplifiers? I think not.) I gotta look at the zeners and diodes in this puppy next. Work my way up the chain. I've swapped out the relays, of course. I think I should spend a few minutes staring at the schematic and maybe it'll come to me. Obviously, it's not in the tube section, or the power supply (main SS output rails, or any other shared source PS system) section, or the outputs themselves (did quick tests there with whoops..gotta go back and check those load resistors/diodes again..with the outputs removed maybe)..so this, overall.. limits the possible areas of concern. It's gotta be bias or offset. And at that point, there isn't all that much to check. All that extra crap on the output board maybe complicates the issue. Ugh. It certainly does in terms of figuring out what is what, in the physical/locational sense. What a mess.
After much self abuse, I'm about ready to give up on these things. Maybe move onto some units that have bipolar outputs. And maybe not Mikey's designs, either. But there is little doubt I will at least stick to hybrids.
I might go after Gilbert's stuff next. (Blue Circle) No circuit boards! Gotta love that. Big plus, right there.
Things are coming together in the audio world, but it will initially be slow going, of course...as for amplifiers...we will talk.
Hi Ken,
Look at it this way. At least you are not forced to send Counterpoint gear back to M.E. I should show you the DA-10 that went down for upgrades where they actually destroyed the PCB. It came back with different caps and a ruined PCB. I also discovered the board layout is badly flawed. Surprised?
-Chris
Look at it this way. At least you are not forced to send Counterpoint gear back to M.E. I should show you the DA-10 that went down for upgrades where they actually destroyed the PCB. It came back with different caps and a ruined PCB. I also discovered the board layout is badly flawed. Surprised?
-Chris
Nope, not suprised. But I managed to compound the problem further. Test proble slipped while checking the Mj340 on the analog computer's one +15V output. The little 7815 blew it's head off.. not suprising with 70VDC put on it's output. Thar she blows! Now I really have to fix it, no doubt there. Outputs are likely fine, though.
Time to park that amp for a while and move on to other stuff. No time to remain frustrated with it. Too much other stuff to do.
Time to park that amp for a while and move on to other stuff. No time to remain frustrated with it. Too much other stuff to do.
Hi Ken,
Sorry to hear that. Let me know if I can help.
Ken, I need to talk to you with regard to moving stuff bought in the US into Canada. I paid UPS $90 yesterday in clearing fees. Duty and taxes on top.
These clearing fees exceeded 1/3 the value of the items. I can't afford to do this. I don't mind paying the duty and taxes, I just want to avoid the vultures.
-Chris
Sorry to hear that. Let me know if I can help.
Ken, I need to talk to you with regard to moving stuff bought in the US into Canada. I paid UPS $90 yesterday in clearing fees. Duty and taxes on top.
These clearing fees exceeded 1/3 the value of the items. I can't afford to do this. I don't mind paying the duty and taxes, I just want to avoid the vultures.
-Chris
OK. With regards to the funky audio cables, the feline is beginning to move from restrictive confinement.
The cable does away with propagation and skin effect issues. This may seem like a very odd statement, but it will become clear when everyone knows what I'm speaking about (re: the cables).
A few people publicly know about the cables now and the news of it's existence will travel fast.
In all seriousness, you guys will love it. Not only does the cable make serious sense in a scientific way, it also sounds fabulous. I'm not engaging in a ego trip here, with my musings, I'm just eager to share this funky new toy with you guys.
Edit
Chris: It is my intention to send you both amps. If I would remember to do so, dammit!
The cable does away with propagation and skin effect issues. This may seem like a very odd statement, but it will become clear when everyone knows what I'm speaking about (re: the cables).
A few people publicly know about the cables now and the news of it's existence will travel fast.
In all seriousness, you guys will love it. Not only does the cable make serious sense in a scientific way, it also sounds fabulous. I'm not engaging in a ego trip here, with my musings, I'm just eager to share this funky new toy with you guys.
Edit
Chris: It is my intention to send you both amps. If I would remember to do so, dammit!
Hi Ken,
No problem. At the moment I have been very slow in everything I do. It's frustrating since I have not seemed to have recovered from the doctor's messed up treatment. It will take some time yet before I am up to my previous slow pace.
Be good to see you by though. Door's open if you are in the area.
-Chris
No problem. At the moment I have been very slow in everything I do. It's frustrating since I have not seemed to have recovered from the doctor's messed up treatment. It will take some time yet before I am up to my previous slow pace.
Be good to see you by though. Door's open if you are in the area.
-Chris
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