Review Tubelab SE B+ - DRV jumpers, please? - diyAudio
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Old 22nd February 2010, 07:43 PM   #1
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Default Review Tubelab SE B+ - DRV jumpers, please?

I think it's evident that the mentions of leaving B+ and DRV alone for off-board Power Drive, etc means that the 'normal' build jumpers these, but I want to make sure.
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Old 22nd February 2010, 08:20 PM   #2
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DRV_B+ gets a jumper, yes. I believe that you leave off this jumper if you want to isolate the FET drains from the B+ rail so that you can use them to drive a different pair of tubes running on an external B+ rail.
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Old 23rd February 2010, 12:58 AM   #3
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Quote:
I think it's evident that the mentions of leaving B+ and DRV alone for off-board Power Drive,
Yes, the normal build gets a jumper. I designed this board so that it could be used for the driver in a bigger amp like my 845SE. In this case the power supply on the Tubelab SE doesn't get used, or even built. These and other points on the board are where the wires to the external power supply get connected.

I had intended to provide the details for this build up, but from the emails I was receiving it became evident that the majority of people who wanted to built the 845SE had no business attempting an amplifier that ran on 1200 volts and costs nearly $1000. Several perspective builders had never built a tube amplifier before.
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Old 23rd February 2010, 01:37 AM   #4
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Quote:
the majority of people who wanted to built the 845SE had no business attempting an amplifier that ran on 1200 volts
What's the problem? Just include that big Lexan screen with the board! And tongs. Long wooden tongs. And Igor, don't forget Igor

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Old 23rd February 2010, 03:25 AM   #5
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Is that right, Misster EpstEEn?
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Old 23rd February 2010, 11:53 AM   #6
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Actually I would be very interested in using the board as a driver board. I was thinking of trying to use the 45 to drive the 300B. Would it work ?

D.
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Old 23rd February 2010, 04:02 PM   #7
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It can drive 300Bs directly in the on-board sockets....
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