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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: what am I missing? posted by vinnie2 on September 14, 2014 at 09:25:03:
More often than not pentodes and beam tetrodes are graphically represented as tetrodes.This means that the "uppermost" grid is g2, because g3 is not represented in the symbol.
The reason for this is that in most pentode and beam tetrode tubes g3 (or the beam former in beam tetrodes) is internally connected to the cathode, and does not have it's own pin.
Basically, you can only make 2 choices here:
1)connect g2 to the anode, which will create a "triode mode" connection,
2)connect g3 to the anode, which means you will connect the cathode of the tube directly to the anode, bypassing the tube itself...The latter will most probably blow a fuse, provided you have installed one...
My father used to say that with electricity you can only make one mistake. Be careful!
*******
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http://rh-amps.blogspot.com/
Edits: 09/14/14
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Follow Ups
- RE: what am I missing? - Alex Kitic 11:08:09 09/14/14 (2)
- RE: what am I missing? - vinnie2 13:53:03 09/14/14 (0)
- RE: what am I missing? - vinnie2 11:13:23 09/14/14 (0)
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