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Old 25th November 2008, 04:06 AM   #151
N1ESE is offline N1ESE  United States
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HOLY COW! It works! Much, much better!

Damn schematic. I don't always have the luxury of building from a parts list so I naturally build from a schematic. I'm really glad George was able to come on tonight and find this problem with the schematic. Wow.

Thanks to all.
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Old 25th November 2008, 06:11 AM   #152
chrish is offline chrish  Australia
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There you go!

So you now have a great amp! Congratulations!

Well, for your troubles you have managed to help Tubelab fix his web page, and probably help fix a bunch of headaches for future builders!

Let us know how you like the amp!

Chris
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Old 25th November 2008, 11:12 AM   #153
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Who would have known? I've learned something new today. Glad to hear it's working now.

I never even saw that "other" schematic. I always referenced the one here:

http://www.tubelab.com/AssemblyManua...ematic_SSE.htm
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Old 25th November 2008, 11:57 AM   #154
N1ESE is offline N1ESE  United States
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Quote:
Originally posted by Ty_Bower
I never even saw that "other" schematic. I always referenced the one here:

http://www.tubelab.com/AssemblyManua...ematic_SSE.htm
Which is wrong too. I used the other one because this one you just linked is too small to read on my big monitor. However, looking closely I can see that this one has the swapped values as well.

I can't believe the fix was so simple, ugh!

I must say, for a little amp this thing really puts out now. I listened to it most of the night. The KT88 and CXSE combination really pumps out some decent bass as well to these junk speakers. Going to be really interesting to hear how it sounds on some real speakers.
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Old 25th November 2008, 12:07 PM   #155
n_maher is offline n_maher  United States
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Quote:
Originally posted by N1ESE


Which is wrong too. I used the other one because this one you just linked is too small to read on my big monitor. However, looking closely I can see that this one has the swapped values as well.
You sure about that? On my monitor that schematic correctly shows R16 as a 100ohm grid resistor and R15 as a 220k resistor to ground. On the other, incorrect schematic the resistor values and placement are correct, it's just the text label for each that is in the wrong spot.

Quote:
I can't believe the fix was so simple, ugh!
If it were me I'd be dancing that the fix was easy. Better that than a shorted trace on the pcb or something like that (don't ask me how I know how much hell that can be to find).

Now I'm getting psyched about working on mine again.
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Old 25th November 2008, 12:09 PM   #156
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Both schematics appear to have the correct values on them. I think George fixed it last night or this morning. Probably need to hit "refresh" on your browser, otherwise it might be showing a cached copy.
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Old 25th November 2008, 12:29 PM   #157
N1ESE is offline N1ESE  United States
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Need to order another board from George now.
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Old 25th November 2008, 12:44 PM   #158
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Quote:
Both schematics appear to have the correct values on them.
Not fixed yet. The resistor values have always been correct on the schematic, just the lables R15, R16 are switched.

There is a more serious issue with the schematic, the name. About 6 months ago I received correspondence from the company that owns the trademark on the word "simple se" without the space between the simple and the se. It was agreed that to avoid legal issues I would never put those two words together in print again. I fixed the schematic at that time, but now it is obviously unfixed. I am off to work now, but I will come home at lunch time to fix this before I get in trouble.
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Old 25th November 2008, 04:46 PM   #159
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OK, the schematics are now correct. It seems that there were three different versions of the Simple SE schematic resident on the web hosting server. Two of them were referenced by the actual web pages, neither were the correct one.

I have added PDF versions of the schematics and PC board outlines for both boards.

I have learned to beware the words" Let Front Page merge the changes". I still don't know what that means but I now now how to fix it. Delete the entire site from the hosting server and reload it.

I have used Microsoft Front Page for the Tubelab web site since day one. It is no longer supported and I am slowly learning Expression Web. I have started on a new Tubelab web site but haven't had the time to finish it.

Agian, I apologize for the confusion this has caused.
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Old 25th November 2008, 04:50 PM   #160
N1ESE is offline N1ESE  United States
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Quote:
Originally posted by tubelab.com
Agian, I apologize for the confusion this has caused.
No worries George, crap happens. I've been listening to the amp all morning now and it sounds very nice indeed even on my junk speakers. Once we identified the problem, it only took a few minutes to rework the board.
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