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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: Cathode resistors... posted by korneluk on March 3, 2007 at 16:08:00:
Your post convinces me that I need to look more carefully -- the schematic was not in error. However, the 470 ohms resistors are in parallel with each filament (across the filament) and do not connect to ground. Rather, there is a 330 ohm resistor way on the right hand side of the schematic to ground, bypassed by a 470uF cap. That provides the cathode bias for 2 2A3s, and should be fine.I am not sure where Les's pair of 100 ohm resistors from filaments to ground went (in relation to the schematic), but think my analysis was correct. They burnt up because that were biasing the 2A3s with 50 ohms and therefore carrying a lot of DC bias current (plus a little filament current) and it was too much.
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- Re: Cathode resistors... - Perseo 04:05:08 03/04/07 (0)
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