I wasn't sure whether to start this in power supplies or solid state , as the "victim" is a classic Altec Lansing 2204a. My question is about the trafo. I never seen one like this. By the photo below , it seems to be 2 completely separate transformers paralleled. On each one , (green-red-yellow-red-green) = 46-38-0-38-46vac. Both "sides" are paralleled (see below).
#1- What would a trafo like this be called ?? (not a EI ? )
#2- Why did they parallel them and could it be used for a dual mono amp even as both windings use the same core ?
#3- what might a 32lb. trafo be rated at (VA ?). The amps were 4 X 75w or 2 X 150w bridged.
I could find no info on this amp AT ALL. Took a gamble for $20usd at Ebay.
I intend to use this for my Cordell triple as it seems to have the DC values after rectification that I desire. reds will give +/-55Vdc and greens will give +/-65Vdc (boosted supply).
PS- all the original amps work perfectly - would literally give them away (few $) to a Altec fanatic.
OS
#1- What would a trafo like this be called ?? (not a EI ? )
#2- Why did they parallel them and could it be used for a dual mono amp even as both windings use the same core ?
#3- what might a 32lb. trafo be rated at (VA ?). The amps were 4 X 75w or 2 X 150w bridged.
I could find no info on this amp AT ALL. Took a gamble for $20usd at Ebay.
I intend to use this for my Cordell triple as it seems to have the DC values after rectification that I desire. reds will give +/-55Vdc and greens will give +/-65Vdc (boosted supply).
PS- all the original amps work perfectly - would literally give them away (few $) to a Altec fanatic.
OS
Attachments
it is R-core transformer . for audio it is better than E-I transformer in EMI radiation which will result in humming . it is been used in many japanese audio products long back . now it is absolute and no one manufacturing . for hi-end market is took away by torroidal transformers .
for audio quality
1. torroidal
2. R-core
3. E-I core
for audio quality
1. torroidal
2. R-core
3. E-I core
Maybe not ? ... I saw it was "R" not "C" , a lot of chinese R cores !!
American , too !
China -
R-core transformer-DIBAO Transformer
USA-
Products - Custom Magnetics, Inc.
They say it has best qualities of both E-I and toriod , and best efficiency. Two coils cancel each others field.
I got the freakin' best... dang !!
OS
American , too !
China -
R-core transformer-DIBAO Transformer
USA-
Products - Custom Magnetics, Inc.
They say it has best qualities of both E-I and toriod , and best efficiency. Two coils cancel each others field.
I got the freakin' best... dang !!
OS
I've seen them referred to as UI cores. They are often used instead of EI cores from about 1 kVA and up. My 230V/230V isolation transformer for the workbench is of that type.
If the primaries of the two transformer legs are run in series (maybe for European line voltage?) you'd definetely need the windings of both legs to be in either series or parallell, otherwise you'd get high voltage drop and radiated flux because the magnetic couping between the two legs isn't very high.
If the primaries of the two transformer legs are run in series (maybe for European line voltage?) you'd definetely need the windings of both legs to be in either series or parallell, otherwise you'd get high voltage drop and radiated flux because the magnetic couping between the two legs isn't very high.
Hi Os....
This is UI transformer like someone mentioned......The power can be calculated the same way like for the EI transformer.......It has advantage that it is low if compared to EI.......both coils must be wounded absolutely identical and than you can connect them in parallel on in series.......Such transformers have a lot ,,window,, space so you can wound a lot of wire or in the case of audio amplifier some wire with higher diameter to suck every single watt from the core, because we talk only about pulse consumption.....Those transformers are common in Big power amplifiers made by Crown and Carver.....
Regards, Taj
This is UI transformer like someone mentioned......The power can be calculated the same way like for the EI transformer.......It has advantage that it is low if compared to EI.......both coils must be wounded absolutely identical and than you can connect them in parallel on in series.......Such transformers have a lot ,,window,, space so you can wound a lot of wire or in the case of audio amplifier some wire with higher diameter to suck every single watt from the core, because we talk only about pulse consumption.....Those transformers are common in Big power amplifiers made by Crown and Carver.....
Regards, Taj
Hello Ostripper, as you found, no direct info on the amp you have. But from the tech article below:
http://alteclansingunofficial.nlenet.net/publications/techletters/TL_263.pdf
it appears that this is a variation on the Altec 2275, which is an outgrowth of the Altec 2200, which seems to be somewhat modular:
http://www.altecpro.com/pdfs/vintag...ers/powerAmps/2200 Power Amplifier Manual.pdf
Hope this helps.
Peace,
Dave
http://alteclansingunofficial.nlenet.net/publications/techletters/TL_263.pdf
it appears that this is a variation on the Altec 2275, which is an outgrowth of the Altec 2200, which seems to be somewhat modular:
http://www.altecpro.com/pdfs/vintag...ers/powerAmps/2200 Power Amplifier Manual.pdf
Hope this helps.
Peace,
Dave
Thanks, but I found that already - tells how to bridge the amps.
I'm testing this amp's PS now ... rewired the AC , new 50A bridge ... all soldered and heatshrinked 12 GA ! power wiring (below 1-2). Just by reverse enginneering it , I found how to get what I want (A 70-0-70Vdc "beast")
All ready for my Cordell/Luxman triple OP.
PS (below 3) is one of the original amps. They used the lower voltage secondary to run these , but the same trafo was used in the A/L 9444b.
The 9444b used the higher 50-0-50 secondary taps to get 200w/8r and over 300w/4r per channel. BTW - case is actually stainless steel .. ha ha all for 20USD
Attachments
Last edited:
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.