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Old 4th January 2013, 11:25 AM   #31
m145mcc is offline m145mcc  United States
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Duly noted, ill go back to the previous one.
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Old 4th January 2013, 11:44 AM   #32
m145mcc is offline m145mcc  United States
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ok after thinking about it I'm gona go buy a few books before I waste any more of the forums time. I appreciate your patience, I clearly don't know as much as I did thought about analog circuits.
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Old 4th January 2013, 01:34 PM   #33
m145mcc is offline m145mcc  United States
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Ok so I'm feeling good about this one... I hope I properly cold biased the first stage. Or should I hot bias the first stage (attenuate) then cold bias the second.
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Old 4th January 2013, 02:21 PM   #34
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I don't think you'll be happy with what you've done there. Rk of 39k will give you a fuzzy (almost fluffy) compressed sound with no headroom. If you're looking for a good wide range of overdrive I think you should go with a DC coupled cathode follower. Read this, all of it. DC Coupled Cathode Follower
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Old 4th January 2013, 02:23 PM   #35
m145mcc is offline m145mcc  United States
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Thanks, I will. While I have you, would it be a good idea to use a limiter for the output.
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Old 4th January 2013, 02:31 PM   #36
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You will want to have an output level control. Take a look at the bottom of the AC Cathode follower page and you'll see an example for an effects loop. The send level control is what you want to do. It's simple and doesn't affect the tone.

Also, have you decided what to do with your heater voltage? If you don't have 12.6V anywhere you might want to regulate down from your 40V supply and have a nice, stable 12.6V DC heater. With only 1 tube the load will only be 150mA.
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Old 4th January 2013, 02:37 PM   #37
m145mcc is offline m145mcc  United States
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I was going to grab a 250va toroidal transformer from parts express then either use a regulator or a ziner to drop it down. thanks for the links.
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Old 4th January 2013, 02:49 PM   #38
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That little hammond transformer that I linked earlier would be perfect (and more efficient) for heaters, but then you'll have multiple transformers. It easy for the cost of amps to creep up. haha...
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Old 4th January 2013, 02:50 PM   #39
m145mcc is offline m145mcc  United States
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I really hate sounding stupid, but I couldn't figure out how to order one. Do you have to go thought a distributor or something?
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Old 4th January 2013, 02:54 PM   #40
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No worries, you're just getting into it

166F6 Hammond Manufacturing | 166F6-ND | DigiKey
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