05-23-2016, 11:31 AM
(This post was last modified: 05-23-2016, 11:35 AM by karpathion.)
(05-23-2016, 10:42 AM)GoldenVulture Wrote: PI is only necessary when your running push/pull pairs. splits your signal into a 180 Deg phase difference.
The basic concept of the power amp section is pretty simple. Signal into valve , out of valve and into transformer to speaker.
It is essentially always on max output. Alittle water anology. Water is the signal . Preamp is a tap. Power amp is the pipe its feeding into.
Driving your output valve would be say a 12A** valve. Something like a 12AT7 [ i hope I've got that right ] is used because it has a stronger output current to drive the output valve than a 12AX7. The trade off is it doesn't have as large a gain factor.
Yup, I've been doing some much needed reading this morning on power sections. I was thinking the PI worked a little different than it does. Had go back and stare at the 2203 schematic for a minute to see it and make it click, but I see it now.
For some stupid reason I got a little mixed up on how the power tubes ran as well, but we don't need to go into that. I make myself look like a dumbass enough as it is. I guess I just forgot the section on push/pull operation in school.
After what I'm learning this morning and what I want in an amp, I'm going to have to buy a new PT or salvage one from another amp.
I want a 12-15W version of what my Windsor is now. An exact 2204 setup, on a pair of EL84s. If I can get the transformers sorted out, I can do it. It's not like it has never been done before, and the Classic Tone OT can handle 15W.
Any one have a 1.5A, 120V primary, and 6.3V & 260-290V secondary PT?
I hear Mexico is nice this time of year.