>
>I went to the site mentioned a few days ago with all the amp pictures,
>http://www.angenent.org/W7IUV/amp-pix.htm and noted that most of these put
>the vacuum variables horizontal with the tuning shafts straight out the
>front panel. With all the talk about stray inductance and grounding, I'd
>like to ask why they all do this?
>
? Builders who use horiz. mounting apparently did not read the Jennings
catalog.
>I saw an amp by an anonymous fellow that seemed like a much better design.
>This baby used four 8877's in parallel grounded grid and two vacuum
>variables mounted vertically to the same chassis plate, right next to the
>tubes.
? Semi-excellent.
Four 8877s are way more expensive than one 8171. They require twice as
much drive and they do not have handles.
>The plate inductor jumped across the two standup vacuum caps. The
>tuning shafts went into the bottom chassis, through right angle drives and
>out to the front panel.
>
>The key advantage of this approach is excellent ground return paths with the
>tradeoff being two right angle drives.
Indeed. Multronics/Cardwell makes a right angle drive that is ideally
suited for this purpose. It is designed to replace the tuning shaft
collet. (see Ugly Amp. on my web site.)
>..
later, Jeff.
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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