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Pass Labs 20 Years and Counting

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  #1  
Old 05-31-2021, 04:43 PM
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Default Pass Labs Class A Amp Warmup Question

Hey gang,
I know many folks here love and enjoy Pass Lab amps.

Some of you may remember I built up two Nelson Pass-designed Amp Camp amps last summer.

I've set these up again over the long Memorial Day holiday weekend to get some real hours on them and on my (also DIY) GR-Research X-LS Encore speakers (which I recently found out need 400 hours of running in), and have an anecdotal observation that they seem to require about an hour of warm-up time to fully come "on song". When I listen to them as soon as I switch them on, they seem to be a bit thin and 2-dimensional sounding. Once they've been on for an hour so, though, they really do sound very good, especially when run as a pair of bridged monos.

Here they are set up on the floor in a quickie set-up configuration (sorry for the quality of the quickie iPhone 12 "snapshot")



Is this observation consistent with your experiences? What do you guys that have a Pass Class A amp typically do? Do you leave the amp on all the time, or fire it up for listening sessions?

Lastly, I'm not telling you guys anything you don't know, but Nelson Pass is a genius.
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  #2  
Old 05-31-2021, 05:49 PM
GSOphile GSOphile is offline
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I would look to Kent English at Pass Customer Service for his experience and opinion.
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Old 05-31-2021, 06:07 PM
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Originally Posted by GSOphile View Post
I would look to Kent English at Pass Customer Service for his experience and opinion.
Thanks, I know Kent. Cheers.
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First Sound Presence Deluxe 4.0 MkIII-Si Paramount Special Edition preamp, Conrad-Johnson LP70S amp, Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion w/ EAR324, Oppo BD-83SE, Sonore OpticalModule with Uptone Audio LPS-1.2 power supply, Uptone Audio EtherREGEN, SOtM UltraNeo with Keces P3 power supply, Shunyata Omega & Sigma Ethernet, Alpha USB digital cables, Lampizator Baltic 3 DAC, Mac Mini/Roon, Harbeth 30.2 or Dynaudio Contour S3.4 w/ Esotar 2 tweeters, REL R-305, Shunyata Alpha V2 ICs, Shunyata Alpha V2 speaker cables, Shunyata Sigma XC, Sigma NRv2, Alpha NRv2, Alpha XC, Delta NR v2, and Venom V14D power cords, Shunyata Everest 8000
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Old 06-01-2021, 07:12 PM
slowGEEZR slowGEEZR is offline
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Stephen, I've owned and loved the Pass Labs 100.5s for quite a few years now.I leave the back switch on, but power up with the front switch to listen. They sound fine right off the bat, but sound better by the end of the first record and then, prior to the end of the second record, they sound more relaxed and simply disappear and all that is left is the music. The soundstage is open and wide on the first record, but becomes deeper by the second record. Most importanty, an ease to the sound is fully there by the second record. Hope this helps.
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Old 06-02-2021, 01:00 AM
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Quote:
Originally Posted by slowGEEZR View Post
Stephen, I've owned and loved the Pass Labs 100.5s for quite a few years now.I leave the back switch on, but power up with the front switch to listen. They sound fine right off the bat, but sound better by the end of the first record and then, prior to the end of the second record, they sound more relaxed and simply disappear and all that is left is the music. The soundstage is open and wide on the first record, but becomes deeper by the second record. Most importanty, an ease to the sound is fully there by the second record. Hope this helps.
Many thanks. Yes, I've found that about 45 minutes of warmup is about where they get "on the cam", as we say in motor racing.

I've been listening to my little Amp Camp amps as bridged mono blocks since the beginning of the long holiday weekend, and I have to say that now that they are getting more hours on them, they are starting to sound very good indeed. Nelson Pass, I tell ya what...

And...for 654 bucks, they're rather amazing.



😻
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Old 06-03-2021, 06:12 AM
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I leave my Pass preamp and phono on all the time. The amps are in stand by and I turn them on about an hour before I sit down to listen. I don't notice much change after they have been warming up for an hour. This is the first solid state gear I've owned that doesn't make me want any tubes in the system.
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Old 06-03-2021, 09:06 PM
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Quote:
Originally Posted by daveneumann View Post
I leave my Pass preamp and phono on all the time. The amps are in stand by and I turn them on about an hour before I sit down to listen. I don't notice much change after they have been warming up for an hour. This is the first solid state gear I've owned that doesn't make me want any tubes in the system.
Tnanks, Dave.

I'm finding the same thing; the little ACAs seem to come on-song after about 45-60 minutes.
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First Sound Presence Deluxe 4.0 MkIII-Si Paramount Special Edition preamp, Conrad-Johnson LP70S amp, Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion w/ EAR324, Oppo BD-83SE, Sonore OpticalModule with Uptone Audio LPS-1.2 power supply, Uptone Audio EtherREGEN, SOtM UltraNeo with Keces P3 power supply, Shunyata Omega & Sigma Ethernet, Alpha USB digital cables, Lampizator Baltic 3 DAC, Mac Mini/Roon, Harbeth 30.2 or Dynaudio Contour S3.4 w/ Esotar 2 tweeters, REL R-305, Shunyata Alpha V2 ICs, Shunyata Alpha V2 speaker cables, Shunyata Sigma XC, Sigma NRv2, Alpha NRv2, Alpha XC, Delta NR v2, and Venom V14D power cords, Shunyata Everest 8000
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Old 06-03-2021, 09:08 PM
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Quote:
Originally Posted by daveneumann View Post
I leave my Pass preamp and phono on all the time. The amps are in stand by and I turn them on about an hour before I sit down to listen. I don't notice much change after they have been warming up for an hour. This is the first solid state gear I've owned that doesn't make me want any tubes in the system.
Thanks, Dave, I'm finding pretty much the same thing; the ACAs need about 45-60 minutes of warm-up.
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First Sound Presence Deluxe 4.0 MkIII-Si Paramount Special Edition preamp, Conrad-Johnson LP70S amp, Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion w/ EAR324, Oppo BD-83SE, Sonore OpticalModule with Uptone Audio LPS-1.2 power supply, Uptone Audio EtherREGEN, SOtM UltraNeo with Keces P3 power supply, Shunyata Omega & Sigma Ethernet, Alpha USB digital cables, Lampizator Baltic 3 DAC, Mac Mini/Roon, Harbeth 30.2 or Dynaudio Contour S3.4 w/ Esotar 2 tweeters, REL R-305, Shunyata Alpha V2 ICs, Shunyata Alpha V2 speaker cables, Shunyata Sigma XC, Sigma NRv2, Alpha NRv2, Alpha XC, Delta NR v2, and Venom V14D power cords, Shunyata Everest 8000
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