Morgan Jones KT88 PP

E810F · 5th December 2008, 06:31 PM

Hello Chaps,

Has anyone built the Morgan Jones KT88 PP on page 314 of VA 2nd edition?

kenpeter · 5th December 2008, 11:40 PM

I've seen only the 3rd edition. And it alluded to another book as-if
they might be a set? The book I saw (in basement library at UTA)
was almost entirely practical wisdom in regard to constructing and
testing the amplifier, and had very little on valve circuit theory.

I don't recall seeing any KT88 schematic, but my time with the book
was brief. I was not an enrolled student, so checking the book out
or obtaining a photocopier account wasn't really an option.

It was definitely titled Morgan Jones' Valve Amplifiers...
TK7871.58 A9 J66 2004, if it might help you finding it.

Edition I found was at Neederman Hall, not the main UTA library.
I was only there for one week of National Instruments training...
And its over now, but mabey someone else lives close to UTA
could check into it further.

Richard Ellis · 7th December 2008, 12:23 AM

Is this the same one as on P.247 on MJs' first edition?
It's described as "Balanced input amplifier using differential pair and balanced feedback", output power noted as 30W into 8 Ohms.
__________________________________________Rick.... .......

E810F · 7th December 2008, 10:05 AM

Yes, it appears on p247 of the 1st edition and page 314 of the 2nd edition.
It is absent from the 3rd edition as Mr. Peter points out.

The output stage appears to be based on the GEC '88-50'

Brett · 7th December 2008, 10:14 AM

I have the 3rd edition. Can someone post the schematic please?

E810F · 7th December 2008, 10:26 AM

I would happily scan and post the circuit, but I would assume this would be an infringement of copyright?
If a moderator could please advise?

SY · 7th December 2008, 10:32 AM

Yes, it would. I'll email Morgan to see how he feels about it; if he grants permission, I'll let you know.

Brett · 7th December 2008, 04:54 PM

Quote:

Originally posted by SY
Yes, it would. I'll email Morgan to see how he feels about it; if he grants permission, I'll let you know.

You're right, I didn't think that far. However, I'd be happy just to have a look at it directly (not posted) as I'm curious and it's for educational purposes, which is legal here to the best of my knowledge. I have purchased both BVA and VA - 3.

However, I will respect Morgan's wishes either way.

SY · 7th December 2008, 11:55 PM

Morgan says no problem, go ahead and post it.

Brett · 8th December 2008, 04:45 PM

Quote:

Originally posted by SY
Morgan says no problem, go ahead and post it.

Thanks to you both.

If E810F is still willing, I'd still like to see it. Cheers

5th December 2008, 06:31 PM	#1
E810F diyAudio Member Join Date: Jun 2003 Location: Near Brighton	Morgan Jones KT88 PP Hello Chaps, Has anyone built the Morgan Jones KT88 PP on page 314 of VA 2nd edition? __________________ when I was a viking, my friend he was the raven

7th December 2008, 10:05 AM	#4
E810F diyAudio Member Join Date: Jun 2003 Location: Near Brighton	Yes, it appears on p247 of the 1st edition and page 314 of the 2nd edition. It is absent from the 3rd edition as Mr. Peter points out. The output stage appears to be based on the GEC '88-50' __________________ when I was a viking, my friend he was the raven

7th December 2008, 10:26 AM	#6
E810F diyAudio Member Join Date: Jun 2003 Location: Near Brighton	I would happily scan and post the circuit, but I would assume this would be an infringement of copyright? If a moderator could please advise? __________________ when I was a viking, my friend he was the raven

7th December 2008, 10:32 AM	#7
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Yes, it would. I'll email Morgan to see how he feels about it; if he grants permission, I'll let you know. __________________ If there's a sucker born every minute, where do the rest of them come from?

7th December 2008, 11:55 PM	#9
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Morgan says no problem, go ahead and post it. __________________ If there's a sucker born every minute, where do the rest of them come from?


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5th December 2008, 11:40 PM	#2
kenpeter diyAudio Member Join Date: Nov 2007 Location: Dallas	I've seen only the 3rd edition. And it alluded to another book as-if they might be a set? The book I saw (in basement library at UTA) was almost entirely practical wisdom in regard to constructing and testing the amplifier, and had very little on valve circuit theory. I don't recall seeing any KT88 schematic, but my time with the book was brief. I was not an enrolled student, so checking the book out or obtaining a photocopier account wasn't really an option. It was definitely titled Morgan Jones' Valve Amplifiers... TK7871.58 A9 J66 2004, if it might help you finding it. Edition I found was at Neederman Hall, not the main UTA library. I was only there for one week of National Instruments training... And its over now, but mabey someone else lives close to UTA could check into it further.

7th December 2008, 12:23 AM	#3
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	Is this the same one as on P.247 on MJs' first edition? It's described as "Balanced input amplifier using differential pair and balanced feedback", output power noted as 30W into 8 Ohms. __________________________________________Rick.... .......

7th December 2008, 10:14 AM	#5
Brett diyAudio Member Join Date: Jan 2002	I have the 3rd edition. Can someone post the schematic please?

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