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Pass HPA-1, what do we know?
Pass HPA-1, what do we know?
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Old 16th October 2018, 12:34 AM   #41
JeffYoung is offline JeffYoung  Ireland
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Pass HPA-1, what do we know?
Right you are on the SILMICs. Forgot about that part.
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Old 19th October 2018, 10:11 PM   #42
Mark Johnson is offline Mark Johnson  United States
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Pass HPA-1, what do we know?
TO92 device count suggests that Wilson current mirrors might very well be involved....
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Old 19th October 2018, 10:23 PM   #43
Hikari1 is offline Hikari1  United States
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EVUL has been watching this thread...

UTHAiM -- Just for Fun
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Old 19th October 2018, 10:49 PM   #44
JeffYoung is offline JeffYoung  Ireland
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Pass HPA-1, what do we know?
I agree about the Wilson. A Buffered Feedback mirror also has 3 transistors, but the connections don't appear to match what little we can see on the board.

Thanks for that link, Hikari. The UTHAiM definitely looks to be a kissing cousin.
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Old 19th October 2018, 11:01 PM   #45
Hikari1 is offline Hikari1  United States
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Also this topology:

Cubie2

I use the front end of this as a preamp. Very, very good.
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Old 20th October 2018, 10:51 PM   #46
JeffYoung is offline JeffYoung  Ireland
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Pass HPA-1, what do we know?
Oh no. Now I have to figure out what a "folded cascode" is....
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Old 12th January 2019, 04:18 AM   #47
lae2 is offline lae2  United States
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I recently upgraded to Bryston BCD-3/HPA-1/XA25 connected to Aerial 7s. All interconnects are home brew silver/Teflon instrumentation. Absolutely stunning. I will be auditioning Devore Fidelity speakers in the coming months. Nevertheless the XA25 appears to drive the Aerial 7s without breaking a sweat.

I am currently making custom cables. As this group no doubt knows, the HPA-1 is singled-ended only. No balanced . The Six Moons review quoted Jam Somasundram; "By the very nature of its design, it will drive long runs of cable." I am building 12 foot interconnects between the HPA-1 and XA25. The effective gauge is 17g center and 17g return with singled ended shield. When Jam was quoted "long runs of cable" do you think 12 feet is within reason? Thanks.

Last edited by lae2; 12th January 2019 at 04:25 AM.
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Old 12th January 2019, 04:32 AM   #48
indra1 is offline indra1  Indonesia
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Oh no. Now I have to figure out what a "folded cascode" is....
Don't worry Jeff, the ones in the Cubie2 are actually normal cascodes, not folded.
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Old 12th January 2019, 04:36 AM   #49
Hikari1 is offline Hikari1  United States
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Hpa-1 is high current for a preamp, since it was designed for headphones. Shouldn’t be an issue at all even with 24g interconnects.

17awg is pretty big for an rca cable. Maybe too big?
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Old 12th January 2019, 05:28 AM   #50
lae2 is offline lae2  United States
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Originally Posted by Hikari1 View Post
Hpa-1 is high current for a preamp, since it was designed for headphones. Shouldn’t be an issue at all even with 24g interconnects.
17awg is pretty big for an rca cable. Maybe too big?
Thank you for commenting. "too big?" Silver plated Teflon insulated/jacket instrumentation cable that I have used for decades. There is so much psychology. To my ears, this cable outperforms lamp cord. And it only costs a thousand times more than lamp cord. WBT and Furutech. I use varying configurations of the same cable for power, interconnects, and speakers. Thus, 17 gauge is simply what I have configured (2X20) in both directions for interconnects. I do not use the shield for a return.

Last edited by lae2; 12th January 2019 at 05:33 AM.
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