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Old 16th February 2005, 11:22 PM   #21
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I am building about the same thing, But i am Using an Emeinace Delta lite 10" 300 Watt with a 350 watt amp section from a Hartke head. I am using a different transformer so i am expecting 150-200 watts from it.

I am buildign a small portable cab for small shows and practice etc.

The driver only weighs 7lbs, and them amp section adds another 3lbs but the dang transformer weights a lot, 10-20lbs! depending on what i use plus the weight of the cab....

I wish i could find a nice Switching power supply that would give me +/- 50, 60 or 70VDC

That would really make this a nice lite system.


Anyone have any ideas???


Zc
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Old 16th February 2005, 11:25 PM   #22
R.G. is offline R.G.  United States
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Is the existing trannie a toroid? You might save some weight that way if it's an EI.
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Old 16th February 2005, 11:58 PM   #23
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ZC, a torroid should be lighter as RG said. The 500VA torriods I have here on the floor of my workshop are only about 2.5 - 3kg or 6lbs from a 'hand' test.
If you're going to rebuild it into the cab, put it on the bottom rear to aid balance when you're moving it. Also, don't cut the holes for the handles on the cab until it's roughlt built and put them where your hands actually go.
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Old 17th February 2005, 01:24 AM   #24
Variac is offline Variac  United States
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If you want lightweight and lots of power AND sound great:

http://www.41hz.com/main.aspx?pageID=85

home page:
http://www.41hz.com/

These use the Tripath chips. Super efficient so require smaller transformer.

A bass player also, BUT his amps require some precise soldering because they have some surface mounted devices so might not be the best first project. Will get you a couple of hundred watts though!





Check out the Class D amp threads for more of this type of amp.
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Old 17th February 2005, 02:12 AM   #25
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Variac, thanks for the tip re the 41Hz amps. I've been waiting for the UCD 400's to be available again locally before I rebuild my rig and get rid of the big lump of an amp I'm using now, so these might be worth looking into instead. Price isn't too bad either.
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Old 17th February 2005, 04:21 AM   #26
Variac is offline Variac  United States
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This is the thread where I found out about them:

List of products using Tripath Chips

I think the buzz is that the UCD modules (Philips patent) are the best sounding, but Bel Canto uses the Tripaths and are reputed to sound very good, and I have 3 of the Sonic Impact $30 amps that also use Tripath, and they are amazing - especially in midrange.

I don't know much about instrument amps, but it seems that bass players don't want the distortion of tubes as much as guitar players, and need lots of power. The Tripaths are going to sound better than any regular PA amp I'll bet!, and are small and light. Marantz just announced a Tripath PA amp , you can find a reference to it on the link above.
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Old 17th February 2005, 04:23 AM   #27
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I dont have any of the original chassis parts. I bought the modules on Ebay, one worked and the other i fixed. they came with the heat sink tunnels so there nice small complete units. i just need to add a Power supply. so now im on the hunt for a small 400-500Va transformer.

I might want to try one of those switchmode amps. im curious how well they would stand up to such abuse. Still would like to find a switch mode power supply as well.


Zc
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Old 17th February 2005, 05:34 AM   #28
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Quote:
Originally posted by Zero Cool
they came with the heat sink tunnels
Remember these are usually designed to be fan force cooled.
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Old 17th February 2005, 06:12 AM   #29
Variac is offline Variac  United States
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My impression is that the switchmode amps can take more abuse than chip amps. Partly because they don't need much heatsinking/ or with decent heatsinking its hard to overheat them.
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Old 17th February 2005, 02:18 PM   #30
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This is probably opening a can of worms, but if I was to decide between
bridged amp1
http://www.41hz.com/main.aspx?pageID=88
or the bridged LM4780
which would you choose and why?
As I am reading this thread is the biggest advantage heating differences?

Also, how the heck do you power the bridged amp1? Am I not seeing how many volts are required to produce those stats? I am wondering if the 21VAC+21VAC 225VA transformer I got off ebay would work for that also.
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