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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 6th August 2015, 03:44 PM   #1
diyAudio Member
Join Date: Aug 2014
Default I am back

Hello everyone,

I was pretty busy to finish my TubelabSE and by the time i left my built, it has a short circuit that kills to fuse.

Now I have time at nights to finish the amp.

And after I read George's "checkout", today I have played with the amp without tubes and with just rectefier tube.

Here are the results.

This is without any tube.
Click the image to open in full size.

And this one is with just rectefier tube.
Click the image to open in full size.

Do you think B+ and B- is too much?

IMO B+ looks too much and i don't think any rectefier tube will survive.

What could be the cause?

Thanks inadvance,
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Old 7th August 2015, 03:20 PM   #2
zxx222 is offline zxx222  Europe
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Join Date: Aug 2005
Location: b
It should be ok with no load. When I was finishing mine I measured it with rectifier and preamp tubes set at 176V. B+ was 475V B- 393V. After I put power tubes (300b) and biased them to 68 mA, B+ dropped to 385V.
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Old 7th August 2015, 10:15 PM   #3
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Join Date: Aug 2014
I will try to rewire the amp on sunday. I had a shortcircut somewhere on the board so i removed all the cables.

So it is actually ok to have +529v on B+ with just rectifier tube Still sounds too much though
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