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Pass HPA-1, what do we know?
Pass HPA-1, what do we know?
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Old 8th October 2019, 09:52 PM   #141
Hikari1 is offline Hikari1  United States
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Jeff,

Interested to hear your impressions of HPA-1 as a line amp. Let us know if you are able.
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Old 8th October 2019, 10:23 PM   #142
JeffYoung is offline JeffYoung  Ireland
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Pass HPA-1, what do we know?
@Hikari1, will do. It was built to feed a pair of these:

Pass HPA-1, what do we know?-beefcake-jpeg

But as I don't have the Beefcakes built yet I might compare it to the pre-amp section of my Rogue Cronus Magnum....

Cheers,
Jeff.
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Old 8th October 2019, 10:58 PM   #143
Hikari1 is offline Hikari1  United States
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Beefcake front end is quite interesting.
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Old 8th October 2019, 11:21 PM   #144
JeffYoung is offline JeffYoung  Ireland
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Pass HPA-1, what do we know?
It's essentially a J2 modified to handle +/-50V rails.

Here's the latest version of the front end with its shunt regulators:

Pass HPA-1, what do we know?-beefcake-frontend-2-pdf

Cheers,
Jeff.
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File Type: pdf beefcake frontend 2.pdf (148.5 KB, 457 views)
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Old 9th October 2019, 12:13 PM   #145
PiotrL is offline PiotrL  Ireland
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Quote:
Originally Posted by JeffYoung View Post
So how's it sound?

(...)

The SEX was more fun than the T3, but if I was listening seriously I'd be annoyed by the loss of detail. The Pass consistently gave me goosebumps where the other two didn't. For me? The Pass without a moment's hesitation.
Jeff, would you mind to share what source was feeding those amps?
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Old 9th October 2019, 12:22 PM   #146
JeffYoung is offline JeffYoung  Ireland
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Pass HPA-1, what do we know?
Nothing special -- a 20-year-old NAD CD player that I've been using for all my auditions.

In use they get fed by Roon -> Metrum Ambre -> Metrum Onyx, but I can't easily get to the cables of my main system for comparison tests.

I'm in Louth if you want to drop by for a listen....
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Old 9th October 2019, 10:05 PM   #147
PiotrL is offline PiotrL  Ireland
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Sounds great Jeff, however I'm in the process of building one myself, I guess it may be interesting to see if they will sound different :-)

Inspiring build!
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Last edited by PiotrL; 9th October 2019 at 10:24 PM.
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Old 9th October 2019, 11:10 PM   #148
JeffYoung is offline JeffYoung  Ireland
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Pass HPA-1, what do we know?
Cool! Let me know when you get it done and we'll have to meet up somewhere....

Cheers,
Jeff.
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