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markmoke
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Post subject: Replacement Audio Output Transformers Posted: Jun Tue 21, 2016 9:30 pm |
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Joined: Nov Wed 12, 2014 9:35 pm Posts: 1054 Location: Ann Arbor, Michigan 48108
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I needed an audio output transformer for a 30s radio I am working on so I took my last donor out of my parts crib. I hate to have none on hand, so I ordered three of these. Just came today. They are really nice! And less than $4 a piece! http://www.parts-express.com/70v-10w-sp ... r--300-040Where have they been hiding all my life? Mark K8KZ
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Leigh
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Tue 21, 2016 9:41 pm |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 31285 Location: Maryland 20709, USA
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Hi ark,
Those are line-to-voice coil transformers designed for use on a 70-volt (or 25-volt) distribution line.
They're not meant to connect directly in a tube plate circuit. The insulation on the primary might not even be suitable for the expected plate voltage.
- Leigh
_________________ 73 de W3NLB http://www.AtwaterKent.info Click "Grebe Stuff" for Synchrophase info
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markmoke
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Wed 22, 2016 12:18 am |
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Joined: Nov Wed 12, 2014 9:35 pm Posts: 1054 Location: Ann Arbor, Michigan 48108
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You don't say? As Rozqnna Rozannadana would say....never mind. Mark K8KZ
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markmoke
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Wed 22, 2016 12:25 am |
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Joined: Nov Wed 12, 2014 9:35 pm Posts: 1054 Location: Ann Arbor, Michigan 48108
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Who carries those universal audio output transformers any more? You know something 20 bucks or less. I wanted to order a couple to keep on hand.
I thought AES had them, but I can't seem to bring them up.
Thanks,
Mark K8KZ
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markmoke
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Wed 22, 2016 12:29 am |
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Joined: Nov Wed 12, 2014 9:35 pm Posts: 1054 Location: Ann Arbor, Michigan 48108
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I think this is what I want. https://www.tubesandmore.com/products/P-T291Do you ever feel like you're talking to yourself? Thanks for the advice Leigh. Mark K8KZ EDIT: Oh man, just realized that's a push pull transformer. Not what I want. I'll keep looking.
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Leigh
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Wed 22, 2016 2:02 am |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 31285 Location: Maryland 20709, USA
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The best source of modern transformers for tube work that I know of is Hammond Manufacturing in Canada. http://www.hammondmfg.com Their products are carried by all major US distributors. - Leigh
_________________ 73 de W3NLB http://www.AtwaterKent.info Click "Grebe Stuff" for Synchrophase info
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Flinx
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Wed 22, 2016 4:25 am |
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Joined: Sep Mon 10, 2012 10:41 pm Posts: 4107 Location: Phoenix, AZ
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tonymontana
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Thu 23, 2016 7:43 pm |
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Joined: Jun Mon 15, 2015 9:05 pm Posts: 363 Location: Kalispell, Montana
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+1 Leigh
I was going to suggest Hammond myself, but you got there first.
Mark, those transformers you got...not a good idea to use them for the reasons Leigh pointed out. AES does have audio output transformers for tube equipment, but I generally go to Mouser as they carry a larger variety of Hammond products and generally their prices are a little better than AES.
Good luck with your project
Tony KC7ZWH
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markmoke
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Fri 24, 2016 1:08 am |
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Joined: Nov Wed 12, 2014 9:35 pm Posts: 1054 Location: Ann Arbor, Michigan 48108
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No I get it Tony. I'm not going to use them as audio output transformers.
I paid less than 4 bucks a piece, and it would probably cost me 10 bucks to return them. I'll hang onto them or toss them. Not sure.
Thanks!
Mark K8KZ
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Flipperhome
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Post subject: Re: Replacement Audio Output Transformers Posted: Jun Fri 24, 2016 5:41 am |
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Joined: Nov Sat 26, 2011 4:09 am Posts: 9666 Location: Texas. USA
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Technically 'line transformers' aren't gapped and so should be unsuitable for single ended operation but there are reports of them being used successfully, or should I say 'acceptable enough', as an AA5 OPT. Some folks say they can be used if you're 'in a pinch'.
Since you have them anyway you might as well tack one in and see how they do, or don't do.
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