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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: 417A linestage posted by Tubenstein on January 23, 2016 at 18:09:16:
Hey,
you will get closet to a Z-out of 600R if you bypass the 80r cathode resistors but as it is drawn the apparent rp of the tube is = Rp+(Rk*(Mu+1) so assuming a mu of 43 you get an Rp of 5220. When you load that with 5K you get an output impedance of 2550 ohms, parallel two of those stages and you get an overall output Z of 1225.
Bypass the cathode Resistors and you get 5K||1.7K for 1270 ohms per tube and 635 for the parallel pair.
dave
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Follow Ups
- RE: 417A linestage - dave slagle 18:43:52 01/23/16 (2)
- RE: 417A linestage - Tubenstein 09:19:59 01/29/16 (0)
- RE: 417A linestage - dave slagle 19:23:48 01/23/16 (0)
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