Want your opinion!

vdi_nenna · 15th January 2004, 06:10 PM

Hi Everybody,

I have 2 @ 15+15 3.3 amp toroids. If you had these transformers, what Pass DIY project would you build?

Can either be Preamp or amp.

Your opinions are appreciated greatly.

Thanks,

Vince

joensd · 15th January 2004, 08:54 PM

You could try a mini-aleph but definitely would have to lower the bias to no overheat the transformers.
I´d only do it if you have 8Ohm speakers which are hyper-efficient.
Or you could switch all the secondaries from the trannies in series to get 60VAV and build a Bride of Zen.

Jens - still hasn´t finished a Pass project in a proper chassis but had a nice time reading the articles

grataku · 15th January 2004, 09:03 PM

You could sell them to me so I can finish the Aleph-based headphone amp.

In the pass camp 3amps are too low even for a "FirstWatt" AX and 15V are too few for a BLS based preamp.

vdi_nenna · 15th January 2004, 09:48 PM

$12 each + shipping and their yours. Never used. So Sad.

Mark A. Gulbrandsen · 16th January 2004, 12:41 AM

I used a 320VA 13+13 toroid in my Mini and it works out fine for running both channels. Heck, I use my Mini for my computer sound system! I don't think 15+15 is that far off not to be able to use them. Just be sure to have adaquate heatsinking for the output devices. The bias will be a bit higher but thats all the better.

Mark

MikeW · 16th January 2004, 01:33 AM

What to build? What do you want or need? Do you have any diy pass amps or pre-amps?

vdi_nenna · 16th January 2004, 02:07 AM

Zen and BOZ.

Dr. ODD · 16th January 2004, 01:20 PM

Hi Vince

You could build a Pearl

Bernhard

joensd · 16th January 2004, 02:53 PM

Quote:

I used a 320VA 13+13 toroid in my Mini and it works out fine for running both channels. Heck, I use my Mini for my computer sound system! I don't think 15+15 is that far off not to be able to use them. Just be sure to have adaquate heatsinking for the output devices. The bias will be a bit higher but thats all the better.

Mark

Aren´t his trannies something like (15V+15V)*3.3A=99VA.
The introduction of the mini-a from Grey had 18V rails and bias a bit over 2A I think.
That´d be around 72WDC which is a lot for a 99VA trannie.
A 15V/3.3A secondary will definitely sag down to something like 18VDC maximum.
Never researched how long the trannie would survive such a project but I personally would lower the bias or place some fans on the transformers. The hum from the transformer will probably be louder than the fans anyway.

Cheerio

vdi_nenna · 16th January 2004, 03:27 PM

Someone expressed interest in them, so I think I'm going to sell them.

I have the trannies for a mini-XA waiting.

Thanks for all your input!

Vince

15th January 2004, 06:10 PM	#1
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Want your opinion! Hi Everybody, I have 2 @ 15+15 3.3 amp toroids. If you had these transformers, what Pass DIY project would you build? Can either be Preamp or amp. Your opinions are appreciated greatly. Thanks, Vince

16th January 2004, 01:33 AM	#6
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	What What to build? What do you want or need? Do you have any diy pass amps or pre-amps? __________________ MikeW

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15th January 2004, 08:54 PM	#2
joensd diyAudio Member Join Date: Dec 2001 Location: Germany	You could try a mini-aleph but definitely would have to lower the bias to no overheat the transformers. I´d only do it if you have 8Ohm speakers which are hyper-efficient. Or you could switch all the secondaries from the trannies in series to get 60VAV and build a Bride of Zen. Jens - still hasn´t finished a Pass project in a proper chassis but had a nice time reading the articles

15th January 2004, 09:03 PM	#3
grataku diyAudio Member Join Date: Dec 2000 Location: -	You could sell them to me so I can finish the Aleph-based headphone amp. In the pass camp 3amps are too low even for a "FirstWatt" AX and 15V are too few for a BLS based preamp.

15th January 2004, 09:48 PM	#4
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	$12 each + shipping and their yours. Never used. So Sad.

16th January 2004, 12:41 AM	#5
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	I used a 320VA 13+13 toroid in my Mini and it works out fine for running both channels. Heck, I use my Mini for my computer sound system! I don't think 15+15 is that far off not to be able to use them. Just be sure to have adaquate heatsinking for the output devices. The bias will be a bit higher but thats all the better. Mark

16th January 2004, 02:07 AM	#7
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Zen and BOZ.

16th January 2004, 01:20 PM	#8
Dr. ODD diyAudio Member Join Date: Dec 2003 Location: Wolfsburg	Hi Vince You could build a Pearl Bernhard

16th January 2004, 03:27 PM	#10
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Someone expressed interest in them, so I think I'm going to sell them. I have the trannies for a mini-XA waiting. Thanks for all your input! Vince

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