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Microsoft Publisher but I had to create my own component symbols. If you have the basic program tho I'd be happy to share the symbols I've already create...
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Ok folks here is revised schematic complete with omitted capicitor in the PI. I'm also not quite sure that my voltages will be as high as Duncan's says. Other...
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Thanks for your input Juan. I do agree it would be easier to build an 18w however I'm limited by my friends lack of funds & therfore need to use what...
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Oops folks, don't know why I marked down 6CA4 for power tubes... I know they are 6BQ5s. Doh! Making corrections (grumble, grumble, grumble)
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Biasing & Gain questions
Hi y'all, back after a somewhat lengthy hiatus & trying to help out a friend in need of cheap quality amplification. He's never built anything before...
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Hey Rhodesplyr... turns out this tube IS a 12AU7A but I do have some 12BH7 about too as I've got Hammonds coming out of my ears (presently I've an A-100,...
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Thanks guys... Actually showed the tube to a friend over the weekend. After his first glance he scratched his head a bit as it does in fact look like it's...
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12AH7A info
Was pulling parts from an old Hammond H-143 organ this past week... got a lot of nice vintage goodies from it, among them a 12AH7A tube. Having not previously...
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Ambitious New Compilation
Just finished drawing this up. It's a more ambitious design for me & I could really use a few more sets of eyes looking it over before I go any further....
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It's like I'm better off doing away with the MV then & just attenuating the output which would also then allow running it full out (or close) where I'll...
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A few general questions
Well this past week it turns out has been enlightening for me so... before I go back to the drawing board I've a few "general questions" I'd like...
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Ok, so if I understand you correctly NFB loop needs to attach to last preamp stage before a cathodyne PI, however if located along with MV control Presence...
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Ah ha! Ok guys, light bulb finally kicked in here. So because cathodyne has unity gain I can't tie in feedback loop like an LTP. When using cathodyne must...
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Well I guess I use the "building block" method using tried & true designs from the past & attempting to incorporate some of the new or modern....
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Re-tweaked Design
Once again here is my "American Girl" design from thread "Errors?" started yesterday. I'm looking for smooth & consistant operation...
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Moving this to new thread... Please see "Re-tweaked Design" & leave any additional comments there. Thanks.
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Further tweak to PS bias supply shown here... Seems all that is still needed is what to do with that 3rd triode & "fix" the PI & should...
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Ok J M, wasn't sure if I could add a presence control to a cathodyne PI or not... guess that's not allowed. As for the 100k pot on the 1st stage, this is...
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Ah ha! You've brought up some good points there Ian. 1st I took your advice & stiffened up the PS significantly (50u/32u/32u/16u) as well as altered rail...
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Thanks but I just realized I posted an earlier revision. This is the one I meant to post where I split the load going into the follower & corected the...
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