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300BSE series
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Old 30th March 2004, 12:49 PM   #1
meandrew is offline meandrew  United Kingdom
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Default 300BSE series

Hi All although this kit has not been released by hificollective as of yet (it is due to be released at the end of April and there is a waiting list for orders) has anyone seen anything remotely in the same league as this?

any comments would be greatly appreciated
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Old 14th April 2004, 02:24 AM   #2
DougL is offline DougL  United States
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Location: Wheaton IL.
Thanks for a look at this.

This broadened my ideas about 300B SE amps.

Good Luck;

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Old 14th April 2004, 07:06 AM   #3
SHiFTY is offline SHiFTY  New Zealand
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Cool, open-source schenatics.

Interesting how they use a pentode into a cathode follower to drive a 300B, I thought those were a no-no?

This amp is a heretic!
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Old 14th April 2004, 09:56 AM   #4
AKSA is offline AKSA  Australia
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Join Date: Sep 2001
Location: Melbourne, Australia
Hi Shifty,

Yes, perhaps the design is heretic.

There is a lot of hidden detail to it; indicates huge experience.

First, the EF86 pentode was used in some of the Leak and the Quad II. In this circuit, gain would be close on 45dB, so only one stage is required, not the usual three. Nothing wrong with pentodes in SE; good ones sound great. Another very good pentode, used by Pete Millett for driving an 813, is the 12HG7.

Second, a CF is fine if the right tube is chosen and the operating point carefully selected, usually by listening tests. A benefit is that biasing the output tube is easier since it takes place at the CF itself, and the warm-up cycle of the tubes is very well accommodated.

Thirdly, Grove is using a judicious combination of cathode bias and fixed bias. This is unusual, and shows considerable thought has gone into the design. Most 300Bs with cathode bias sound a little too fruity to me; this design would sharpen it up considerably.

This is, in my view, a very good design specifically designed for outstanding sonics. There is no evidence I can see of an overly mathematical or PSpice approach; the design is based on solid, empirical experience.


Aspen Amplifiers P/L (Australia)
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