Kt90 Pse

Mikewong · 22nd August 2006, 06:45 AM

I just finished my ARS KT-90 PSE
running with 440 V at 88ma/tube with fantastic sound and surpases in almost every aspect as compared to PP mode.
And is it advisible for me to drive these tubes further at 100ma to gain a bit more watts?

Geek · 22nd August 2006, 11:04 AM

Hi,

It's rated 50 watts dissipation. You're running it currently at 38.72 and 100mA would take it to 44W. If your supply B+ is fair stable, I'd say go for it

Mikewong · 23rd August 2006, 02:21 AM

Thank you!

richwalters · 29th August 2006, 06:52 PM

Just to let know.....I've been very let-down with KT90's....I did a sub for an 88 amp running at 550V and the KT90's couldn't handle the B+. Funny enough I put a JJ KT88 in and it performed better than a KT90!
The KT90 is supposed to take 600V in UL easily. Noway

richj

Tweeker · 29th August 2006, 07:02 PM

Late KT90 production is reportedly quite inconsistant.

rwellerson · 29th August 2006, 09:15 PM

Which KT90 brand name?
EI or EH?
I've read the EH are wonderful and much better than EI nowadays....
Old KT90s from EI are known to be much better than newer ones from their fabrication.

[ ]
Ricardo

Tweeker · 29th August 2006, 09:57 PM

EI.

Mikewong · 9th February 2007, 07:19 PM

The KT-90s I used were bought in 92 from ARS,USA in matched quad
and still going strong after 8 full yrs of service. And starting last, the tubes were used in PSE instead of PP offering around 22watts driving the Celestion SL-60. Within normal listen level,the combinations deliver more details, better separation and more highs as used in the PP mode.
And I love it.
,

jane · 10th February 2007, 11:31 AM

Quote:

Originally posted by Mikewong
I just finished my ARS KT-90 PSE
running with 440 V at 88ma/tube with fantastic sound and surpases in almost every aspect as compared to PP mode.

Do you want to share the schematic with us?

Jan E Veiset

Mikewong · 15th February 2007, 07:44 PM

My EL34PSE is based on this schematic.
And credit should go to the original designer.

22nd August 2006, 06:45 AM	#1
Mikewong diyAudio Member Join Date: Apr 2003 Location: Milan	Kt90 Pse I just finished my ARS KT-90 PSE running with 440 V at 88ma/tube with fantastic sound and surpases in almost every aspect as compared to PP mode. And is it advisible for me to drive these tubes further at 100ma to gain a bit more watts?

29th August 2006, 07:02 PM	#5
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Late KT90 production is reportedly quite inconsistant. __________________ Be sure your foil hat has a good low impedance ground.

29th August 2006, 09:57 PM	#7
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	EI. __________________ Be sure your foil hat has a good low impedance ground.

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22nd August 2006, 11:04 AM	#2
Geek diyAudio Member Join Date: Sep 2004	Hi, It's rated 50 watts dissipation. You're running it currently at 38.72 and 100mA would take it to 44W. If your supply B+ is fair stable, I'd say go for it

23rd August 2006, 02:21 AM	#3
Mikewong diyAudio Member Join Date: Apr 2003 Location: Milan	Thank you!

29th August 2006, 06:52 PM	#4
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	Just to let know.....I've been very let-down with KT90's....I did a sub for an 88 amp running at 550V and the KT90's couldn't handle the B+. Funny enough I put a JJ KT88 in and it performed better than a KT90! The KT90 is supposed to take 600V in UL easily. Noway richj

29th August 2006, 09:15 PM	#6
rwellerson diyAudio Member Join Date: Nov 2005 Location: BH - Brazil	Which KT90 brand name? EI or EH? I've read the EH are wonderful and much better than EI nowadays.... Old KT90s from EI are known to be much better than newer ones from their fabrication. [ ] Ricardo

9th February 2007, 07:19 PM	#8
Mikewong diyAudio Member Join Date: Apr 2003 Location: Milan	The KT-90s I used were bought in 92 from ARS,USA in matched quad and still going strong after 8 full yrs of service. And starting last, the tubes were used in PSE instead of PP offering around 22watts driving the Celestion SL-60. Within normal listen level,the combinations deliver more details, better separation and more highs as used in the PP mode. And I love it. ,

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