LM3886+6n11 amp build question - diyAudio
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Old 8th May 2012, 06:47 PM   #1
srinath is offline srinath  United States
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Default LM3886+6n11 amp build question

I have this kit -

6N11+LM3886 HIFI Tube Amp Kit Board W Speaker Protect | eBay

I have a stash of 42V dc power supplies. These -

Cisco APS-161UC 4024W Power supplies 34-1694-01 8-681-325-41CATALYST 6000 4KW | eBay

Could I run 2 of those for the + 42 and - 42V and remove the rectifier bridge and the capacitors on the input side, essentially like feeding +42 to pin 1 and 4 and -42v dc to pin 5 of the 3886.
Thanks.
Srinath.
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Old 8th May 2012, 06:58 PM   #2
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Voltages of the range of 42 volts dc per rail are too high for the lm3886. Use a maximum of 36 v per rails for a 8 ohm speaker load.
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Old 9th May 2012, 02:31 AM   #3
srinath is offline srinath  United States
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Default I guess I am looking

I guess I continue looking for a trafo out of my parts pile.
I thought I'd solve the problem by using some of my recent parts acquisitions.
Cool.
Srinath.
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Old 9th May 2012, 07:51 PM   #4
srinath is offline srinath  United States
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Does this amp use the same amount of current out of the + side asthe negative side ?

As in say the amp is 60w a channel and I put a 24v power supply, with a +24, 0 and a -24 supply each with a 2.5 amp capacity, would the negative side be pulling 1 or 1/2 amp but the positive will run out of the 2.5 capacity and be left inadequate.
I mean should I put in a +24 - 0 -24 transformer with a 4 amp on the positive and 1 amp on the negative in terms of amperage capacity ?
Thanks.
Srinath.
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Old 10th May 2012, 02:39 PM   #5
srinath is offline srinath  United States
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OK I have found a 600VA trafo in my stash from a all in 1 box system.
I have a pair of 18v taps in it.
Now lets call these pins a, b and c.
a to b is 18v, b to c is 18v, c to a is 36v. So is that a center tapped - +18 - 0 -18 winding ?

The added benifit is that there is an 8V output that I am going to use as tube warmer.

Anyway I am hoping to get some intelligence on it before I burn up stuff ... thanks guys.
Cool.
Srinath.
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Old 10th May 2012, 05:59 PM   #6
srinath is offline srinath  United States
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Default DC or AC

Quote:
Originally Posted by avbuilder View Post
Voltages of the range of 42 volts dc per rail are too high for the lm3886. Use a maximum of 36 v per rails for a 8 ohm speaker load.
Avbuilder: I wanted to make sure we're talking about the same thing here - 30v ac from a -30 0 +36 AC supply or about 42vdc was what I have sitting around - too high ?

Is -18 0 +18 V ac then good ?

How would I change the power supply if I wanted to run 4 ohm ?

Lower voltage and higher current capacity of the power supply ? Or can I not run 4 ohm at all ?

Thanks.
Srinath.
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Old 11th May 2012, 12:16 PM   #7
srinath is offline srinath  United States
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I meant to say -30 0 +30 AC, not -30 0 +36 ...
Cool.
Srinath.
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