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Old 3rd January 2010, 06:18 AM   #1
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Default DIY tube amp power supply

I finally finished assembling that kit. Now I need a power supply for it. I posted the same thread on 2 different forums but none of the answers are the same. What do you guys suggest?

HIFI AMP KIT valve 6N11 + LM4780ˆ2*60W‰ on eBay.ca (item 180449856016 end time 27-Jan-10 02:28:55 EST)

Here's the schematics
LM478.pdf
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Old 3rd January 2010, 07:40 AM   #2
DougL is offline DougL  United States
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From looking at it quickly, they are specifying an 24 volt dual winding transformer of 150Va or more. Also a 9 v transformer.
The rest of the power supply including the cap multiplier is on the circuit board.

Doug
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Old 3rd January 2010, 07:52 AM   #3
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Heya Frenchie!

We had one of those @ diyAudiofest Victoria - just watch the bum sockets on those and you'll be OK.

Cheers!
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Old 3rd January 2010, 08:06 AM   #4
poynton is offline poynton  United Kingdom
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You require 3 supplies.....

0-24, 0-24 to supply the chipamp @ 150VA (the main power)

0-18, 0-18 to supply the HT to the valve/tube @ 100ma to 500mA

0-9 to supply the valve/tube heater @ 500mA



The 0-24, 0-24 could be a centre tapped transformer ie 24-0-24 but the 0-18, 0-18 must be 2 seperate windings as they piggyback on top of the 24v windings ( to give effectively 42-0-42 )



Hope this helps


Andy


.



Looking at the
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Old 3rd January 2010, 05:05 PM   #5
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Here's what I got from another forum


One with 120v primary, 48v center tapped secondary, or two 24v secondary windings, at least 150vA rating.

One with 120v primary, 36v center tapped secondary, or two 18v secondaries. 5vA would likely be enough.

One with 120v primary, 9v secondary, 3vA or more.
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Old 3rd January 2010, 05:20 PM   #6
kmtang is offline kmtang  Canada
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Find a HP400 audio voltmeter. Take out all the metering part and leave the regulated power supply alone.

Johnny
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Old 3rd January 2010, 08:10 PM   #7
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In addition to the noted power supplies, you will need SIX heatsinks.
Note the four TO220 devices all bunched together...you should have sinks on all four to get full ratings from them. As the are all tightly bunched together consult the technical diagrams for suitable dimensions & clearances for you amp.
As there are zillions of heatsinks available you should be able to find four to fit just right. There is another TO220 device all alone on the board...you could use the same sink as you will be getting for the other four.
Then there is the ampchip itself & that will require a rather large heatsink to cool it down...check out the various heatsinks available & you should find something doable.

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Last edited by Richard Ellis; 3rd January 2010 at 08:15 PM. Reason: Its' two channel!
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Old 3rd January 2010, 11:21 PM   #8
poynton is offline poynton  United Kingdom
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The 4 TO220 devices together are the rectifier diodes. I don't think they require any heatsink. (they would if they were regulator chips which is what "Richard Ellis" may be thinking) The other one on its own is the heater regulator and a heatsink is probably a good idea.


As for transformers, what you have in post#5 is WRONG ! You must have 2 18v secondaries not a centre tapped.
( Otherwise OK )

Andy
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Old 4th January 2010, 03:36 AM   #9
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Good that I didn't buy anything!! I went to an e-store this afternoon that store carries everything but he needed part numbers from the Hammond catalog, way too many options and choices I totally got lost after I found the first transformer (I think I found it)

Here's the catalog could you guys point me which ones I need for sure?


Hammond Mfg. - Electronic Transformers - POWER Index
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Old 4th January 2010, 06:11 AM   #10
poynton is offline poynton  United Kingdom
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182N22 22-0, 22-0 @160VA Don't worry about the volts
182F18 18-0, 18-0 @ 15VA
182K6 6-0, 6-0 @ 15VA


You could try EBAY or other sources




Andy


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