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1. [Amps] Acoustic Noise Comparison (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Thu, 21 Jun 2012 10:12:51 -0700 (PDT); Hello, Still playing with my "new" Alpha 78. I had noticed that the fan was a bit loud for my taste, and thought I'd put a measurement on it. So I dug out my old Radio Shack sound meter and measured.; /archives//html/Amps/2012-06/msg00340.html (7,280 bytes)
2. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Jun 2012 09:28:04 -0700; No experience with that amp, but some components of motor noise are vibrationally coupled to the desk or shelf that the amp sits on. I've reduce that component of the fan noise in my Titan 425 amps b; /archives//html/Amps/2012-06/msg00342.html (7,916 bytes)
3. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Thu, 21 Jun 2012 11:43:06 -0700; Spot on, Jim. The 76A and the 78 suffer from both vibration and turbulence, with the effects compounded by resonances in the sheet metal cover. Better blower mounting and fuzz would help a lot, a sca; /archives//html/Amps/2012-06/msg00351.html (9,103 bytes)
4. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Thu, 21 Jun 2012 15:12:08 -0700 (PDT); ** I do have some "Dynamat" left over from a car project. I might try a few pieces of that stuck to the top & sides - in places where there's nothing for it to short out if it comes loose - which do; /archives//html/Amps/2012-06/msg00357.html (8,482 bytes)
5. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Thu, 21 Jun 2012 15:33:59 -0700 (PDT); ** Forget I mentioned welding. Riveting is clearly the way to go. Flush head aircraft rivets, countersink the top a little deep so they sink below the surface, then dab of bondo - poof, no rivet hea; /archives//html/Amps/2012-06/msg00358.html (8,222 bytes)
6. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Thu, 21 Jun 2012 14:13:54 -0700; I'd hate to warp the cover MIG welding, but then I'm no welder at all - just guessing. Also - just read your last... Angle stock would be stronger, but we're trying to dampen resonance. my seat-of-th; /archives//html/Amps/2012-06/msg00359.html (9,959 bytes)
7. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 21 Jun 2012 20:33:36 -0400; Thats a job for a TIG or a Henrob mini gas torch and lots of patience, that Alpha cover is thin. I use both when required and leave the MIG, arc and old gas stuff for other heavier/less critical work; /archives//html/Amps/2012-06/msg00360.html (11,944 bytes)
8. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Thu, 21 Jun 2012 19:18:38 -0700 (PDT); ** Yeah, I would just rivet, like I said. Got all the stuff in the garage - bucking bars, pneumatic rivet gun, squeezer, umpteen rivets, rivet cutter etc etc. - Jerry _______________________________; /archives//html/Amps/2012-06/msg00361.html (8,529 bytes)
9. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Martin A Flynn <maflynn@theflynn.org>; Date: Thu, 21 Jun 2012 20:54:04 -0400; Jim, Google "3M Panel Bonding Adhesive". Take the cover to any decent autobody shop and ask them to glue the dampers in. Bring your own clamps so you can bring the cover home with you. No paint damag; /archives//html/Amps/2012-06/msg00362.html (9,128 bytes)
10. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Thu, 21 Jun 2012 17:59:34 -0700; Or, you can do like Airbus and glue carbon fiber to aluminum. Oh, wait, we do not want the acoustic insulation to fall off. 73, Colin K7FM _______________________________________________ Amps mailing; /archives//html/Amps/2012-06/msg00363.html (8,604 bytes)
11. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 21 Jun 2012 21:05:06 -0400; My "old" 76A is almost silent with no vibration in the cover. For those that do vibrate, a simple piece of tape on the top of the center partition should quiet it as it has to vibrate against somethi; /archives//html/Amps/2012-06/msg00364.html (11,677 bytes)
12. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Steve Bookout <steve@dx4win.com>; Date: Thu, 21 Jun 2012 21:45:58 -0400; Hello all, Another material I would not hesitate to use is high peel strength ureathane adhesive made by Hardman. It is a 2 part product that comes in small 'double-bubble', single use packages. This; /archives//html/Amps/2012-06/msg00365.html (9,902 bytes)
13. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 21 Jun 2012 21:58:31 -0400; My 76PA 3 holer is almost silent, same sheet metal Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-06/msg00366.html (13,242 bytes)
14. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Thu, 21 Jun 2012 22:08:19 -0400; I have never worked with MDF, but I think it is a wood product (or a plastic product) and an old rule for power amp construction is: never use a combustible material anywhere near the action. I have; /archives//html/Amps/2012-06/msg00367.html (10,327 bytes)
15. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Thu, 21 Jun 2012 19:11:57 -0700; And that's where we have to be careful. I work on dampening and otherwise normalizing enclosures and spaces for artsy designers, so if there's a measurable resonance in a waterfall decay display when; /archives//html/Amps/2012-06/msg00368.html (14,232 bytes)
16. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 22 Jun 2012 07:45:34 +0100; Like the tiles on the outside? -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2012-06/msg00369.html (9,095 bytes)
17. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 22 Jun 2012 00:08:51 -0700; We can worry about the aerospace applications when the patents clear... :P 73, Jim N7CXI _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2012-06/msg00370.html (9,217 bytes)
18. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 22 Jun 2012 10:03:20 -0400; Good points Jim plus my shack is never quiet what with a PC, the xcvr with a small fan always on the finals heatsink, fluorescent lights backround hum and sometimes a radio on an AM or FM station. I; /archives//html/Amps/2012-06/msg00371.html (16,640 bytes)
19. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Chris Gare" <chris@gare.co.uk>; Date: Fri, 22 Jun 2012 15:14:44 +0100; On my home built 2 x 8877 amplifier I have a low power switch that turns the fan and blower down to tick-over on long-term standby and it is as quiet and my PC. They go to full speed when I TX or whe; /archives//html/Amps/2012-06/msg00372.html (17,706 bytes)
20. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: donroden@hiwaay.net; Date: Fri, 22 Jun 2012 09:17:36 -0500; No one would dare to call you "typical" , Carl !!! Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-06/msg00373.html (8,728 bytes)

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