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Old 11th January 2014, 01:05 PM   #1
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Default Output Transformer for SE / headphone amp

Does anyone know where I can get an SE output transformer with 5k primary and 8-16-32-150-300-600 secondaries ?

I want to be able to use my 55 ohm AKG headphones and some 600ohm sennheiser headphones but I also want to be able to play some 8-16ohm single driver desk top speakers.

I could have Edcor custom make them but before I do I'd like to find out if they already exist. The trans would be something like this from DHTrob.

http://www.dhtrob.com/schemas/galler...X%20Wiring.GIF
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Old 11th January 2014, 01:24 PM   #2
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Why not use the same xformer then Rob uses.
Its from AE-Europe:Home Engels - Automatic Electric Europe - transformatoren
Have fun,
Hilmar
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Old 11th January 2014, 01:29 PM   #3
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I looked at that, i can't find it on there website, I think Rob may have had it custom wound and I don't know German so ordering would be a bit tough.
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Old 11th January 2014, 02:08 PM   #4
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How many watts are you shooting for? I'm working on a flea-watt design with 6y6's and wanted to do something similar but I've run in to the same issue. While it isn't hard to find something for 8-16-32 speakers, finding something that includes 150-300-600 is more difficult.

Remember also that the reflected impedance is a function of the load, not something intrinsic to the transformer. If you can find something with the right ratios, you may not need as many output taps.
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Last edited by Sodacose; 11th January 2014 at 02:20 PM.
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Old 11th January 2014, 03:37 PM   #5
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I'm looking at around 2.5 - 5 watts so I'd like around a 10 watt transformer so I have some head room Mine will be a 6V6 - 6SL7 SE amp

Last edited by mark02131; 11th January 2014 at 03:38 PM. Reason: added tube type
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Old 11th January 2014, 03:50 PM   #6
rmyauck is offline rmyauck  Canada
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I think Edcor makes some of the high ohm ones, but maybe not with multiple secondary taps.
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Old 11th January 2014, 04:09 PM   #7
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Quote:
Originally Posted by rmyauck View Post
I think Edcor makes some of the high ohm ones, but maybe not with multiple secondary taps.
Yeah they do I can get 50 ohms or 600 ohms but I really want more versitility and I want to be able to play the amp through some desk top speakers when I'm in the office by my self.
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Old 12th January 2014, 09:49 AM   #8
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Hi Mark,
send an email to AE-Europe. You can write in English, they speak English 100times better then me
They have a lots of things that donīt show on their website.
The quality is outstanding.
Good luck,
Hilmar
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Old 5th February 2014, 04:00 AM   #9
Abszero is offline Abszero  United States
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Quote:
Originally Posted by mark02131 View Post
Does anyone know where I can get an SE output transformer with 5k primary and 8-16-32-150-300-600 secondaries ?

I want to be able to use my 55 ohm AKG headphones and some 600ohm sennheiser headphones but I also want to be able to play some 8-16ohm single driver desk top speakers.

I could have Edcor custom make them but before I do I'd like to find out if they already exist. The trans would be something like this from DHTrob.

http://www.dhtrob.com/schemas/galler...X%20Wiring.GIF
Mark,
I ordered a pair of SE OT for Jack at ElectraPrint. It is only 2W at 25Hz, 35mA gapped, and I measured 380 ohms DCR primary and 6ohms DCR each secondary. I asked for two 32 ohms secondaries (series is 128 Ohms, parallel is 32 ohms). You can order with two or more secondaries of 8 ohm. This way you can get 1x8 (parallel), 4x8(parallel-parallel), 9x8(parallel-series),, 16x8 ohms (series). I believe that having non-tapped secondaries will offer a more consistent frequency response. In my case I have 26Hz-30kHz(-1dB) for 32 ohms and 29Hz-35kHz(-1dB) for 128 ohms.
Best,
Radu
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Old 5th February 2014, 06:12 AM   #10
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TRANSFORMERS FOR HEADPHONE AMPLIFIERS
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