GU-50 100W output and power transformers - Page 2

agent.5 · 26th March 2007, 08:40 PM

Very interested

Cobra2 · 26th March 2007, 08:48 PM

Did you ask for custom-wound op-trafo? I guess they can make any size, as long as they can be kind-of square...

Arne K

Wavebourn · 26th March 2007, 09:14 PM

I've found a supplier. They want $70/each if I buy 50 of them. Shipping will cost another $560 to my address in California, so I'll have them in my garage for 81 + VAT.

Are you in for $180/pair plus actual shipment costs?

For now:

Cobra2: 2
agent.5 :2
Wavebourn: 46

Waiting one week then ordering them next Monday...

agent.5 · 26th March 2007, 09:42 PM

Yes. Please also allow an ordering option for mono blocks (2 power transformers). What is the spec for the power transformer?

Wavebourn · 26th March 2007, 09:49 PM

Quote:

Originally posted by agent.5
Yes. Please also allow an ordering option for mono blocks (2 power transformers). What is the spec for the power transformer?

120V primary, 285+285V 0.6A anode, 12.6V x 2 3A filament, 100V 0.1A bias

(GU-50 filaments will run from 12'6V AC, the rest from 12.6DC regulated)

I did not find a supplier for them yet, I want to order toroids.

Cobra2 · 26th March 2007, 09:55 PM

$ 180/pair is not to bad. But are they good? I would rather spend twice as much, if I was sure they did not end up as very expensive doorstops...

Some other projects & trafos:

In german;
http://www.jogis-roehrenbude.de/Vers...ommes/GU50.htm

a different (not japan-made) Pioneer;
http://www.elektroda.pl/rtvforum/topic558406.html

http://www.moehrenbude.de/Moehre/mod...howpage&pid=39

http://www.lz2zk.com/?/homebrew/pa/

http://www.realaudiolabs.com/

http://www.goldenmiddle.com/english/trans.htm

Arne K

Wavebourn · 26th March 2007, 11:56 PM

Arne, I sent you e-mail.

Cobra2 · 27th March 2007, 10:18 AM

I'm in for 2 (a pair)...
Did you plan to use any chokes?

Arne K

Wavebourn · 27th March 2007, 04:15 PM

Quote:

Originally posted by Cobra2
I'm in for 2 (a pair)...
Did you plan to use any chokes?

Arne K

Do you mean 2 power transformers?

No, I do not need a choke, I will use IRF730 to regulate screen grid and preamp power.

Looks like there will be kits available including PCBs...

Cobra2 · 27th March 2007, 04:40 PM

I mean op trafos, but might as well get power-trafos too...if they do 2x115V primary.
And pcb...

Arne K

26th March 2007, 08:48 PM	#12
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Did you ask for custom-wound op-trafo? I guess they can make any size, as long as they can be kind-of square... Arne K __________________ Ars longa, vita brevis

26th March 2007, 09:14 PM	#13
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	I've found a supplier. They want $70/each if I buy 50 of them. Shipping will cost another $560 to my address in California, so I'll have them in my garage for 81 + VAT. Are you in for $180/pair plus actual shipment costs? For now: Cobra2: 2 agent.5 :2 Wavebourn: 46 Waiting one week then ordering them next Monday... __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

26th March 2007, 09:55 PM	#16
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	$ 180/pair is not to bad. But are they good? I would rather spend twice as much, if I was sure they did not end up as very expensive doorstops... Some other projects & trafos: In german; http://www.jogis-roehrenbude.de/Vers...ommes/GU50.htm a different (not japan-made) Pioneer; http://www.elektroda.pl/rtvforum/topic558406.html http://www.moehrenbude.de/Moehre/mod...howpage&pid=39 http://www.lz2zk.com/?/homebrew/pa/ http://www.realaudiolabs.com/ http://www.goldenmiddle.com/english/trans.htm Arne K __________________ Ars longa, vita brevis

26th March 2007, 11:56 PM	#17
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Arne, I sent you e-mail. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

27th March 2007, 10:18 AM	#18
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	I'm in for 2 (a pair)... Did you plan to use any chokes? Arne K __________________ Ars longa, vita brevis


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26th March 2007, 08:40 PM	#11
agent.5 diyAudio Member Join Date: Aug 2003 Location: San Francisco, CA	Very interested

26th March 2007, 09:42 PM	#14
agent.5 diyAudio Member Join Date: Aug 2003 Location: San Francisco, CA	Yes. Please also allow an ordering option for mono blocks (2 power transformers). What is the spec for the power transformer?

27th March 2007, 04:40 PM	#20
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	I mean op trafos, but might as well get power-trafos too...if they do 2x115V primary. And pcb... Arne K __________________ Ars longa, vita brevis

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