diyAudio Forums Archive > Top > Loudspeakers > ESLs, planars, alternative technologies Transformer substitution help - Click HERE for Original Thread moray james I just asked Hammond for a step up transformer to run a HV ESL supply. I need 120V in and 750V out almost no current necessary. Quote was about $285.00 OUCH!!! Can anybody suggest a transformer running backwards that would work for a lot less money? Thanks for the help/suggestions. Regards Moray James Audiophilenoob quote: Originally posted by moray james I just asked Hammond for a step up transformer to run a HV ESL supply. I need 120V in and 750V out almost no current necessary. Quote was about $285.00 OUCH!!! Can anybody suggest a transformer running backwards that would work for a lot less money? Thanks for the help/suggestions. Regards Moray James what kind of amperage you looking for? homemade Can you use a higher step-up voltage? I have several laser p/s transformers ; 120v in 1650v out. With a diode bridge , I get 2200vdc. Very good build quality. $20+shipping . Sorry for the AD , just looking to help out. Thanks moray james A few miliamps would be fine as this is for a multiplier stage to feed the diaphragm. Thanks, moray james. furly Hey Moray Did you find that transformer after? I got a couple of 1:50 trannies from hammond for 55$ each but i never priced one to use for a power supply which is something i was planning on doing. Just wondering what you used and where you found. (IF you did) I_Forgot Try this one: http://www.herbach.com/Merchant2/me...tegory_Code=PWS or this one: http://www.herbach.com/Merchant2/me...tegory_Code=PWS or the "ion generator" on this page: http://www.alltronics.com/power_sources.htm There are a lot of surplus places out there that sell this sort of thing. It is not difficult or expensive to adapt any of these for use as a bias supply for ESLs. I_F gl Hi Moray, How about a Hammond 274X. It has 120V in and 750V out. I found a place on the web www.stf-electronics.com, as an example, that sells it for $46.75US. Cheers, Graeme

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