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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: What to do with a 5K SE OPT into 5 ohms? posted by andy evans on September 3, 2015 at 09:45:23:
How about a 4P1L driving a 45 through a step-up interstage. Perhaps a 1:2 or 1:2.5 step-up would suffice. A typical 45 circuit would need about 55V max swing one way. A 2V RMS input will translate to a 56V peak each way (assuming a stage gain of 10 for the 4P1L) through a 1:2 interstage. Although not a big fan of step-ups as drivers, the 4P1L has sufficiently low impedance at ~1K Ohm to handle it. Additionally, IMO a 4x increase in Zout is still low enough at 4K for driving a 45 pretty well.
Edits: 09/03/15 09/03/15 09/03/15
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Follow Ups
- RE: What to do with a 5K SE OPT into 5 ohms? - sideliner 11:41:51 09/03/15 (8)
- A step-up transformer is one good idea - andy evans 23:35:44 09/03/15 (7)
- RE: A step-up transformer is one good idea - sideliner 11:17:15 09/04/15 (5)
- quite rare but an 841 would definitely do what you want~nT - Cleantimestream 13:23:16 09/04/15 (4)
- RE: quite rare but an 841 would definitely do what you want~nT - sideliner 08:58:32 09/05/15 (3)
- RE: quite rare but an 841 would definitely do what you want~nT - euro21 10:47:27 09/05/15 (2)
- RE: quite rare but an 841 would definitely do what you want~nT - dave slagle 11:08:33 09/05/15 (1)
- RE: quite rare but an 841 would definitely do what you want~nT - euro21 11:43:48 09/05/15 (0)
- RE: A step-up transformer is one good idea - Boli46 02:34:25 09/04/15 (0)
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