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Old 15th February 2006, 06:04 PM   #1
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Default pentode driven 300b set amp - any info?

I was told that a set amp will sound better when driven by a pentode
instead of a dual triode because it removes some phase shift problems
and provides more gain.


1) anyone have info about this?
2) which amps are made with this design?
3) which pentodes would be ideal for this type amp?
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Old 15th February 2006, 11:07 PM   #2
arnoldc is offline arnoldc  Philippines
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Really? I was going for the same project as well but with 2A3 for the output.

My friend has a WE91 (310->300B) amp that sounded very good with a Tamura OPT. Another friend loaned me an Angela 91 that sounded somewhat slow and boring.

There are a couple of Pentode driven designs in th net, but look no further as in this forum itself, Thorsten aka Kuei Yang Wang, posted a step-by-step instruction on making a Pentode driven 45 direct coupled amp. In addition, I think the Kofi Annan thread will be using a D3 pentode as his driver for 300B.

I am not that brave to waste my pentode in a direct-coupled design should I screw up the circuit, so I will be making this instead.

Click the image to open in full size.

I got the WE404A values from Thorsten himself.
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Old 16th February 2006, 04:13 PM   #3
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Quote:
In addition, I think the Kofi Annan thread will be using a D3 pentode as his driver for 300B.
That is true. Here's the thread.
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Old 16th February 2006, 11:08 PM   #4
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Hi !
As far as I can see, the pentode is triode-coupled. So one would not call the Kofis amp pentode driven.
ThorstenLarsen
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Old 17th February 2006, 01:45 AM   #5
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Default true pentode mode driver

I am talking about a true high gain pentode driver
sounding better because

1) it is hgher gain
2) you are not using 2 sections of a dual triode with the
phase problems that brings
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Old 17th February 2006, 01:52 AM   #6
arnoldc is offline arnoldc  Philippines
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some pentodes I've seen driving a 300B include 6SJ7 in the Angela 91 amp and Kawakami 300B, SV83 in Thorsten's Legacy, WE310A in the WE91 amplifier.
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