Amp/Preamp Asylum

Looking for a new Amp or Preamp? If you're after tubes, post over here.

Return to Amp/Preamp Asylum

Message Sort: Post Order or Asylum Reverse Threaded

adding cross brace/shield to Parasound halo p5 preamp?

75.105.171.31
Posted on June 12, 2020 at 11:36:28
alley -kat
Audiophile

Posts: 282
Location: southeast missouri
Joined: August 7, 2003



I ran across this mod on the preamp and was wondering if drilling an under sized pilot hole would be good enough for installing the 3/8x3x16" aluminum piece using stainless steel pointed screws any thoughts? Thanks!

 

Hide full thread outline!
    ...
Would it not be better to just add...., posted on June 12, 2020 at 12:04:54
Charlie8521
Audiophile

Posts: 914
Location: South East Michigan
Joined: October 2, 2004
 sound deadening material to the insides of top and bottom of the chassis. If you are trying to shield for EMI, isn't a lead sheet a better option (which is available in art stores for making stained glass windows)? Of course, that material is a flimsy. Just a thought.

 

RE: Would it not be better to just add...., posted on June 12, 2020 at 12:17:46
alley -kat
Audiophile

Posts: 282
Location: southeast missouri
Joined: August 7, 2003
 I might check into the lead sheet also, Dynamat extreme was used as you mentioned for dampening. I have the aluminum all ready I purchased but, it sure is hard to drill I think it's the type used in some gun parts called T 60/61 or something like that. Thanks!

 

What are you trying to do, posted on June 12, 2020 at 13:06:27
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Is it for mechanical bracing or shielding? With shielding there is reflective and absorptive. Aluminum does work well.

I don't remember ss components being prone to mechanical problems.

 

Most likely, posted on June 12, 2020 at 13:57:42
E-Stat
Audiophile

Posts: 37673
Joined: May 12, 2000
Contributor
  Since: April 5, 2002
 he is following Curl's practice with the lead dog JC-2 for purposes of shielding signal from power supply:






 

JB Weld, posted on June 12, 2020 at 15:06:43
Charlie8521
Audiophile

Posts: 914
Location: South East Michigan
Joined: October 2, 2004
 There is a product called JB Weld which is a 2-part epoxy, available at HomeDepot. I've used their products numerous times. It really bonds (welds) things together. Simple, quick, and inexpensive. But once you bond metal pieces together, don't plan on ever separating them. Just a thought.

 

If you must and it seems you .., posted on June 12, 2020 at 16:28:20
bare
Audiophile

Posts: 1879
Joined: April 14, 2009
 'must'.. A piece of copper sheet even 20 gauge makes for a Good shield. Stick it on with screws, pop-rivets even glues. IF serious, then you could separate the components into their own tin boxes. Ice 'n water shield ..(the Unlabelled.. 1/10 the price version of Dino-O-Mat swill ) is only marginally useful if you have microphonic tubes.. Do you?

 

RE: Would it not be better to just add...., posted on June 12, 2020 at 22:59:09
Rick58
Audiophile

Posts: 1118
Location: No. California
Joined: January 24, 2001
 6061

 

RE: Most likely, posted on June 13, 2020 at 07:16:04
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 I'm a little confused here? It looks like the PS and the gain boards are all in one in the rear. The shielding would only protect the control boards. Which don't really need shielding.

EDIT: I think the PS board is the one on the left center. And it's using a heatsink for shielding.

How much EMI is that low powered circuit really putting out anyway? And what about the cables running from the rear PS to the front boards?

I can understand shielding in a power amp, tubed front end or parts near a power tranny. In a preamp as long as the coils and small transformers are placed in correct orientation and with MINOR shielding as needed, there shouldn't be a problem.

 

+1 I think you're right..., posted on June 13, 2020 at 14:44:22
AbeCollins
Audiophile

Posts: 46307
Location: USA
Joined: June 22, 2001
Contributor
  Since: February 2, 2002
The power supply is in the same 'compartment' area as the DAC and analog gain stages. And that heat sink doesn't really offer any shielding.

The horizontal aluminum block appears to be "shielding" the front panel controls. I say "shielding" in quotes because there's no real way to know if it's effective unless he can measure it.

If anything it's just offering a mechanical brace IMHO.



 

RE: Most likely, posted on June 13, 2020 at 14:55:04
E-Stat
Audiophile

Posts: 37673
Joined: May 12, 2000
Contributor
  Since: April 5, 2002
 It looks like the PS and the gain boards are all in one in the rear.

Perhaps. There are gaggles of op amps in both locations.

How much EMI is that low powered circuit really putting out anyway?

Looks like a switcher to me. Lots.

 

RE: adding cross brace/shield to Parasound halo p5 preamp?, posted on June 14, 2020 at 00:23:36
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 When drilling you should Make Certain to get metal chips everywhere. That will maximize your chances of causing a catastrophic short.....
Too much is never enough

 

RE: adding cross brace/shield to Parasound halo p5 preamp?, posted on June 14, 2020 at 07:42:37
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 I had an amp repair that had a tiny metal flake across two transistor legs. It was trapped in the dust bunny and took out the amp board.

 

RE: adding cross brace/shield to Parasound halo p5 preamp?, posted on June 14, 2020 at 10:44:38
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 Case Closed.

I'd get in there with a grinder wheel, too.
Too much is never enough

 

RE: Would it not be better to just add...., posted on June 14, 2020 at 11:07:24
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 I'll admit it.
I HATE aluminum. And the 6000 series? No better or worse than the rest, though its properties are useful.
Could be useful as a 'wall' in the preamp......???
Too much is never enough

 

RE: adding cross brace/shield to Parasound halo p5 preamp?, posted on June 16, 2020 at 18:14:46
alley -kat
Audiophile

Posts: 282
Location: southeast missouri
Joined: August 7, 2003
 This is what gave me the idea. https://audiokarma.org/forums/index.php?threads/parasound-halo-p5-pre-amplifier-38-improvement-pics-heavy.684859/

 

Best thought submitted... Strongest stuff have ever seen... And I make furniture for fun.-nT, posted on June 16, 2020 at 23:23:13
Cleantimestream
Audiophile

Posts: 7551
Location: Kentucky
Joined: June 30, 2005
 !
The Mind has No Firewall~ U.S. Army War College.

 

RE: adding cross brace/shield to Parasound halo p5 preamp?, posted on June 26, 2020 at 16:30:41
DustyC
Audiophile

Posts: 963
Joined: November 4, 2000
 Why not just buy a used JC2 and leave the poor P5 unmolested?
On 2nd thought, maybe just try it and see.

 

Page processed in 0.029 seconds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]