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Old 14th December 2012, 06:30 PM   #1221
DimZ is offline DimZ  Greece
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yes Mike,
i am going to try ss, 274b and the russian 5u4g5s3c .. and maybe some others too (waiting for a telefunken rgn1064) ...

but progress is a little slow ( two kids and a full time job) .....
hopefully by christmas time this linestage will be singing .......
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Old 14th December 2012, 06:38 PM   #1222
mgreene is offline mgreene  United States
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Sweet! Thanks I am so slow it will probably Feb before I get mine built anyway. I will be looking forward to your results...
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Old 14th December 2012, 06:58 PM   #1223
DimZ is offline DimZ  Greece
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by Feb I hope I will be done with the 26 linestage , got almost all parts ....
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Old 14th December 2012, 07:14 PM   #1224
mgreene is offline mgreene  United States
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Dont get me started about how many projects I have staring me in the face

I just finished rebuilding my main speakers with a new woofer and crossovers... been working on them in various guises for about 2 years...

Of course I am getting old too
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Old 14th December 2012, 07:18 PM   #1225
DimZ is offline DimZ  Greece
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same story here ....
done with current speakers last year .... still I have something in mind for the future
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Old 18th December 2012, 08:04 PM   #1226
DimZ is offline DimZ  Greece
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fired it up .......

58ma stable, B+ at start was 335V soon to drop to 240V ....

dc offset was strange , both channels werent stable, one measured between 20-22mV and the other 76-80mV ... changing all the time ...

output cap leaking ? oscillation ?

at least no boom kaboom , no smokes ...


output cap similar to this one only 2uf (http://www.ebay.com/itm/MBGP-2-Paper...50906640986%26)
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Last edited by DimZ; 18th December 2012 at 08:06 PM.
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Old 18th December 2012, 08:08 PM   #1227
Salas is online now Salas  Greece
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How you got the sense and force wires hooked up? Can you describe or sketch the power and ground nodes they meet?
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Old 18th December 2012, 08:08 PM   #1228
DimZ is offline DimZ  Greece
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forgot to mention also, 840 heatsink after 5 minutes cold as ice, 2540 sink hot .....
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Old 18th December 2012, 08:10 PM   #1229
Salas is online now Salas  Greece
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Maybe it draws much. Try boost the CCS at say 70mA to see if it holds before other investigations.
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Old 18th December 2012, 08:10 PM   #1230
DimZ is offline DimZ  Greece
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Quote:
Originally Posted by Salas View Post
How you got the sense and force wires hooked up? Can you describe or sketch the power and ground nodes they meet?
they are tied together along with cathode resistor ground / pot ground and ac mains earth ...
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