>
>:From: "Fisher" <fisher@pldi.net>
>:Am wanting to build an amp based around a single 4CX1000A tube.
>:I don't yet know the significance of the built-in capacitor
>
>More on that later, it's very important for bypass.
>
>:I have scoured my sources and have found nothing specific for the
>4CX1000
>:except the 30S-1 schematic which I would rather not try to apply.
>:Lu K5YP
>
>There are a number of proven 4cx1k designs, I have a few other
>circuits available for posting on the http://sonic.ucdavis.edu server.
>Let me know if you'd be interested, I'll try to get them up early next
>week.
>One is an old QST article I don't like because of no shunt screen
>regulator. Another I could post is a famous "Loudenboomer"
>construction article from some years back. Older hand books
>are another source of ceramic circuits.
>Although the 30S-1 circuit looks hard to copy, it's one of the better
>designs.
>
The 30S-1's cathode driven circuit (AB1) has some advantages, however,
the tuned inputs are way more complex than a grid driven AB1 input, and
the 1A resonant-choke screen supply is a bit more of a job than a shunt
zener-string reg.
cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
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