WTT: LM4780 for Transformer

juan_caliente · 28th April 2007, 09:59 PM

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

juan_caliente · 29th April 2007, 03:24 PM

I also have some lm4702/lm4701 and a nice pair of Advent Bookshelf 1's.

Thanks,

John

juan_caliente · 1st May 2007, 02:38 PM

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

juan_caliente · 2nd May 2007, 04:44 PM

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

Elkaid · 2nd May 2007, 06:36 PM

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)

juan_caliente · 2nd May 2007, 07:42 PM

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

jaudio · 3rd May 2007, 10:25 PM

I have some of what you need. I have no output iron.

Shoot me a PM

28th April 2007, 09:59 PM	#1
juan_caliente diyAudio Member Join Date: Jan 2005 Location: Gilbert	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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29th April 2007, 03:24 PM	#2
juan_caliente diyAudio Member Join Date: Jan 2005 Location: Gilbert	I also have some lm4702/lm4701 and a nice pair of Advent Bookshelf 1's. Thanks, John

1st May 2007, 02:38 PM	#3
juan_caliente diyAudio Member Join Date: Jan 2005 Location: Gilbert	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

2nd May 2007, 04:44 PM	#4
juan_caliente diyAudio Member Join Date: Jan 2005 Location: Gilbert	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

2nd May 2007, 07:42 PM	#6
juan_caliente diyAudio Member Join Date: Jan 2005 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

3rd May 2007, 10:25 PM	#7
jaudio diyAudio Member Join Date: Oct 2004	I have some of what you need. I have no output iron. Shoot me a PM

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