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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 22nd February 2010, 07:43 PM   #1
BillEpstein is offline BillEpstein  United States
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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
rknize is offline rknize  United States
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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
Tubelab_com is offline Tubelab_com  United States
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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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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 23rd February 2010, 01:37 AM   #4
BillEpstein is offline BillEpstein  United States
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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

Click the image to open in full size.
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Old 23rd February 2010, 03:25 AM   #5
rknize is offline rknize  United States
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Is that right, Misster EpstEEn?
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Old 23rd February 2010, 11:53 AM   #6
Nikon1975 is offline Nikon1975  Austria
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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
rknize is offline rknize  United States
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It can drive 300Bs directly in the on-board sockets....
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