Aleph 30 transformer recommendation

SteveA · 7th April 2006, 03:57 PM

I am building an Aleph 30 amp (BrianGT miniA/A30 boards). I was looking for something in the 600-800VA 18-0-18 variety but haven't found anything.

I sent Antek an e-mail (saw a post with 2 400VA 18-0-18 transformers) but have not received a reply.

Does anybody have a favorite transformer for this amp (building as a 2 channel amp)?

Thanks,
SteveA

BrianDonegan · 7th April 2006, 04:30 PM

I am using a couple of Antek's 16V trafos. You could also, since you are in the US, use one of the 34V trafos, and wire the primaries for 220, which will net you dual 17V secondaries, or a 39V for 19.5V.

SteveA · 7th April 2006, 06:21 PM

Quote:

Originally posted by BrianDonegan
I am using a couple of Antek's 16V trafos. You could also, since you are in the US, use one of the 34V trafos, and wire the primaries for 220, which will net you dual 17V secondaries, or a 39V for 19.5V.

Brian,
Thanks for responding. If I understand correctly, I would wire the primaries for 220V but by applying 110V I would get 17V instead of 34V. Is that correct? (Sorry, chemist by training)

SteveA

BrianDonegan · 7th April 2006, 06:50 PM

that's affirmative.

eapavant · 7th April 2006, 09:04 PM

Correct me If I am wrong but, would you then only get 1/4 power if you wired a 120v for 230?

SteveA · 8th April 2006, 12:16 AM

Quote:

Originally posted by BrianDonegan
that's affirmative.

Thanks Brian!!
Steve

BrianDonegan · 8th April 2006, 01:52 PM

Quote:

Correct me If I am wrong but, would you then only get 1/4 power if you wired a 120v for 230?

I don't think so. Half the input voltage across each half ot the primaries will result in half the output voltage across each half of the secondaries.

THX1138 · 22nd April 2006, 10:56 AM

Building also an Aleph 30 (P.Daniel's boards), I was planning to use a 500 VA 18-0-18 V as this kind of toroid transformer is easilly available here (I leave in Europe). Would you think this would be sufficient ?
Also, I plan to use 4 capacitor 47000µF 40V Aerovox : again, would it be sufficient or should I go to a higher total capacitance and voltage rating ?
was also possibly thinking to go to a CLC configuration with these capacitor althought the rail voltage will then be below the nominal 25V.
Thanks for you help.
Olivier

Dennis Hui · 22nd April 2006, 11:30 AM

Olivier,

I used a 500VA 2x20 transformer with roughly the
same amount of capacitance in a CRC configuration
and it worked well. I would imagine that your
set up will also be ok, though with possibly a slightly
lower rail voltage.

Cheers,
Dennis

BrianDonegan · 22nd April 2006, 01:46 PM

I'm running mine off 16VAC trafos, and it sounds great. I don't think you will have any issues with your rails. In fact, you can probably afford more biasing

7th April 2006, 03:57 PM	#1
SteveA diyAudio Member Join Date: Dec 2001 Location: St Paul, MN	Aleph 30 transformer recommendation I am building an Aleph 30 amp (BrianGT miniA/A30 boards). I was looking for something in the 600-800VA 18-0-18 variety but haven't found anything. I sent Antek an e-mail (saw a post with 2 400VA 18-0-18 transformers) but have not received a reply. Does anybody have a favorite transformer for this amp (building as a 2 channel amp)? Thanks, SteveA

7th April 2006, 04:30 PM	#2
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	I am using a couple of Antek's 16V trafos. You could also, since you are in the US, use one of the 34V trafos, and wire the primaries for 220, which will net you dual 17V secondaries, or a 39V for 19.5V. __________________ Twisted Pear Audio

7th April 2006, 06:50 PM	#4
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	that's affirmative. __________________ Twisted Pear Audio

22nd April 2006, 01:46 PM	#10
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	I'm running mine off 16VAC trafos, and it sounds great. I don't think you will have any issues with your rails. In fact, you can probably afford more biasing __________________ Twisted Pear Audio

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

7th April 2006, 09:04 PM	#5
eapavant diyAudio Member Join Date: Aug 2005	Correct me If I am wrong but, would you then only get 1/4 power if you wired a 120v for 230?

22nd April 2006, 10:56 AM	#8
THX1138 diyAudio Member Join Date: Feb 2006 Location: Paris	Building also an Aleph 30 (P.Daniel's boards), I was planning to use a 500 VA 18-0-18 V as this kind of toroid transformer is easilly available here (I leave in Europe). Would you think this would be sufficient ? Also, I plan to use 4 capacitor 47000µF 40V Aerovox : again, would it be sufficient or should I go to a higher total capacitance and voltage rating ? was also possibly thinking to go to a CLC configuration with these capacitor althought the rail voltage will then be below the nominal 25V. Thanks for you help. Olivier

22nd April 2006, 11:30 AM	#9
Dennis Hui diyAudio Member Join Date: Aug 2002 Location: Toronto, Canada	Olivier, I used a 500VA 2x20 transformer with roughly the same amount of capacitance in a CRC configuration and it worked well. I would imagine that your set up will also be ok, though with possibly a slightly lower rail voltage. Cheers, Dennis

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
power transformer recommendation	nukaidee	Tubes / Valves	31	13th December 2008 03:34 AM
3C24 in a SE output stage - output transformer impedance recommendation !!!	aldovan	Tubes / Valves	15	6th September 2008 10:18 AM
transformer selection recommendation for aleph 30	hc167	Pass Labs	12	27th March 2007 04:33 AM
Aikido Transformer recommendation	Original Burnedfingers	Tubes / Valves	0	14th March 2007 10:51 AM
transformer voltage needed for Aleph 4 or Aleph 2	diy student	Pass Labs	23	28th November 2001 07:54 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read