GerryE123 wrote:
> Hi:
>
> I have heard or owned a number of single-ended 45, 2A3 and 300B amps.
Of
> these amps, I liked the 300B ones the least. With that in mind, I just
> recently came across a website for a foreign amplifier manufacturer that
has
> some interesting thoughts about driving the 300B.
>
> I would appreciate your comments about their ideas. Here's the exact
text
> from the manufacturers website (NOTE: I am copying it as-is, it loses a
bit
> in the translation):
>
> What points we are interested in?
>
> Perhaps there are so many 300B single ended amps that we could
> not discern good ones from bad.
>
> For its natural and mellow mid-range, 300B single ended amp
> is loved so much but its anemic bass and weak high frequency
> response drive out many tube amp enthusiast from entering in the
> Single Ended World.
>
> What are the problems?
>
> Basically there has been no good driving force for 300B.
> First, Western Electric's 91B circuit was improvised for
> easy manufacturing (for delayed production of 86B) and higher gain
for
> a theater system.
Two drivers I have found work well for 300b.
1. c3g, running as a pantode with a VR tube regulated screen supply
works very well. d3a is also good.
2. 6n6p Aikido also works well. Best combination I found was a ecc40 as
voltage amp, then 6n6p aikido cap coupled to 300b grid.
If you like the idea of a interstage, the AE interstages are very good,
and drive 300bs nicely driven by something like a 45 or 6em7.
http://www.ae-europe.nl/uitgangstrafo_engels.htm
--
Nick
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