General Question/Old Threshold Equipment - Page 2

Nelson Pass · 26th June 2009, 02:47 PM

I don't recall the rail voltages of the CAS 2. If they don't exceed
50 volts, I'm sure you would be fine.

shriekback · 27th June 2009, 06:35 AM

Mr. Pass,

Thanks so much!

And I thank you for the fine work as well--my SL 10 and CAS 2 bring my favorite music to life better than any other audio gear I have heard (I have heard quite a lot too) and I will keep them alive as long as it is possible.

Best regards.

Steven

woody · 29th June 2009, 12:08 PM

Niconoise asked about the 10 year old new old stock caps he
has and if they were safe to use. No one pointed out that old
unused caps can go bad on the shelf and may need to be reformed. When in doubt I charge old caps through a 1k 5W
resistor just to get a rough idea if the cap's still good.

Nelson Pass · 29th June 2009, 02:52 PM

Caps seem to last a remarkably longer time than the manufacturers
state. A lot of old Threshold and Pass Labs amps are still going
strong even though the caps are operated at a lot of current and
heat, so I have no hesitation using older used and new caps on DIY
projects.

Marcella · 15th July 2010, 08:05 AM

Quote:

Originally Posted by shriekback

Hi all,

I am hoping that someone might give me some guidance in replacing the PS caps in a Threshold CAS 2 poweramp.

The original caps are 6900uf 60v Mallory that are no longer available. Would 15000uf 50v Spargaue caps work okaY? They are the same size (2" D by 2.625" Tall--with raised screw terminals).

If those would not work, any suggestions?

Thanks!

Hi,

Yesterday I replaced the Original Mallory (30 years old) 6900uf in my Still going strong CAS 2 for Mundorf 10000 High Current Power cap. I believe it's worth giving a Threshold CAS 2 a second life. It's still one of Nelson's best poweramp ever made.

kind regards,
Marcella van Kraaij
The Netherlands

Nelson Pass · 15th July 2010, 08:00 PM

I always felt it was under appreciated, probably because the
marketplace was emphasizing "dynamics" at that time.

Fashion has changed a bit since then: witness the success of
lower power amplifiers such as tubes or FW, which have other
charms.

Marcella · 18th July 2010, 03:03 PM

I absolutaly agree with that. Thats why I choose this poweramp in the '70, working together with an Audio Reseacht SP 6C pre-amp. Times has changed but I still enjoying listening to my Cas II in combination with a tube pre-amp. I also owned a newer Threshold S5000 poweramp, but honestly it is not an NP design

.

Jolida · 6th October 2012, 07:42 PM

Quote:

Originally Posted by Nelson Pass

I always felt it was under appreciated, probably because the
marketplace was emphasizing "dynamics" at that time.

Fashion has changed a bit since then: witness the success of
lower power amplifiers such as tubes or FW, which have other
charms.

I just bought a Threshold model 4000 power amp from the second hand market today. The amp has "jarring" on both channels at medium
Volume levels. I love the sound of the amp though. Is this got to do with a capacitor dying or something ? Which section needs attention. Please help

Zen Mod · 6th October 2012, 08:35 PM

what's "jarring" ?

Jolida · 7th October 2012, 06:47 AM

I mean "Distortion" in both channels..

6th October 2012, 08:35 PM	#19
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	what's "jarring" ? __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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26th June 2009, 02:47 PM	#11
Nelson Pass The one and only Join Date: Mar 2001	I don't recall the rail voltages of the CAS 2. If they don't exceed 50 volts, I'm sure you would be fine.

27th June 2009, 06:35 AM	#12
shriekback diyAudio Member Join Date: Aug 2006	Mr. Pass, Thanks so much! And I thank you for the fine work as well--my SL 10 and CAS 2 bring my favorite music to life better than any other audio gear I have heard (I have heard quite a lot too) and I will keep them alive as long as it is possible. Best regards. Steven

29th June 2009, 12:08 PM	#13
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Niconoise asked about the 10 year old new old stock caps he has and if they were safe to use. No one pointed out that old unused caps can go bad on the shelf and may need to be reformed. When in doubt I charge old caps through a 1k 5W resistor just to get a rough idea if the cap's still good.

29th June 2009, 02:52 PM	#14
Nelson Pass The one and only Join Date: Mar 2001	Caps seem to last a remarkably longer time than the manufacturers state. A lot of old Threshold and Pass Labs amps are still going strong even though the caps are operated at a lot of current and heat, so I have no hesitation using older used and new caps on DIY projects.

15th July 2010, 08:00 PM	#16
Nelson Pass The one and only Join Date: Mar 2001	I always felt it was under appreciated, probably because the marketplace was emphasizing "dynamics" at that time. Fashion has changed a bit since then: witness the success of lower power amplifiers such as tubes or FW, which have other charms.

18th July 2010, 03:03 PM	#17
Marcella diyAudio Member Join Date: Jul 2010	I absolutaly agree with that. Thats why I choose this poweramp in the '70, working together with an Audio Reseacht SP 6C pre-amp. Times has changed but I still enjoying listening to my Cas II in combination with a tube pre-amp. I also owned a newer Threshold S5000 poweramp, but honestly it is not an NP design .

7th October 2012, 06:47 AM	#20
Jolida diyAudio Member Join Date: Jan 2012 Location: South India	I mean "Distortion" in both channels..