WTT: LM4780 for Transformer - diyAudio
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Old 28th April 2007, 10:59 PM   #1
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Location: Gilbert
Default WTT: LM4780 for Transformer

Hello Everyone,

I had planned to build some more parallel lm4780 amps but I have two done, and I am going to instead build a bpa400. I need a transformer for it. Would anyone be interested in trading 6 - LM4780 and 4 - LM3875 for a good sized toroid? If you are interested send me an email with what you have.

Thanks,

John
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Old 29th April 2007, 04:24 PM   #2
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Join Date: Jan 2005
Location: Gilbert
I also have some lm4702/lm4701 and a nice pair of Advent Bookshelf 1's.

Thanks,

John
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Old 1st May 2007, 03:38 PM   #3
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I also have an MZ500 mini disk recorder with one disk lying around. Surely someone must have a 39v, 1000va torroid lying around gathering dust
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Old 2nd May 2007, 05:44 PM   #4
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Ok, since no one has any extra transformers lying around, how about some other parts for a tube preamp I am building???

Here is what I need:
Capacitors Qty
0.047uf Orange Drops 2
0.1uf Orange Drops 4
120pf Orange Drops 2
250pf Orange Drops 2
0.047uf Tubular 2
0.1uf Tubular 4
120pf Tubular 2
250pf Tubular 2
47uf / 500v 4
50uf/25v Polarized 4

Resistors
220K 1/2 Watt 4
10K 1/2 Watt 4
270K 1/2 Watt 4
68K 1/2 Watt 4
1.5K 1/2 Watt 6
100K 1/2 Watt 6
1M 1/2 Watt 6


Connectors 1/4 Jack Chassis Mount 7


Pots 10KA Chassis Mount 2
250KA Chassis Mount 4
1MA Chassis Mount 2


Tubes 12AX7 2
8 Pin Socket Ceramic 2



Reply with what you have.

Thanks,

John
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Old 2nd May 2007, 07:36 PM   #5
Elkaid is offline Elkaid  Canada
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Quote:
Surely someone must have a 39v, 1000va torroid lying around
Maybe but a 1000VA toroid transformer worth quite a bit (Ex: Plitrons are around 170$)
Plitron transformers
1000VA Power Transformer
Output: 2 X 38VAC @ 13.16A BUT !

I don't know the BPA400 application and I may be wrong but I have serious doubts about the 39V value you mentionned. I would double-check again if this value is the voltage present on the transformer's secondaries or the rectified voltage.

Well, good luck with your part hunt !
(digikey.com is a very good place to start parts hunt)
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Old 2nd May 2007, 08:42 PM   #6
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Location: Gilbert
Well I posted the 39v 1000va figure as kind of a joke. I figured someone might have offered up something smaller. I really was looking to trade as I am low on funds, but I have quite a bit of unused parts. I might as well share some of the parts that I will never use, and finally finish up some projects.

Thanks,

John
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Old 3rd May 2007, 11:25 PM   #7
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I have some of what you need. I have no output iron.

Shoot me a PM
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