pentode driven 300b set amp - any info?

trioderob · 15th February 2006, 06:04 PM

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?

arnoldc · 15th February 2006, 11:07 PM

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.

I got the WE404A values from Thorsten himself.

Kofi Annan · 16th February 2006, 04:13 PM

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.

thorstenlarsen · 16th February 2006, 11:08 PM

Hi !
As far as I can see, the pentode is triode-coupled. So one would not call the Kofis amp pentode driven.
ThorstenLarsen

trioderob · 17th February 2006, 01:45 AM

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

arnoldc · 17th February 2006, 01:52 AM

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.

15th February 2006, 06:04 PM	#1
trioderob diyAudio Member Join Date: Mar 2005 Location: san diego	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?

17th February 2006, 01:45 AM	#5
trioderob diyAudio Member Join Date: Mar 2005 Location: san diego	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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15th February 2006, 11:07 PM	#2
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	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. I got the WE404A values from Thorsten himself.

16th February 2006, 11:08 PM	#4
thorstenlarsen diyAudio Member Join Date: Jun 2004 Location: Copenhagen	Hi ! As far as I can see, the pentode is triode-coupled. So one would not call the Kofis amp pentode driven. ThorstenLarsen

17th February 2006, 01:52 AM	#6
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	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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