Fw: [AMPS] transformer

[km1h@juno.com]

SNIPPED
>>>
>  Alrighty Carl,  Hammond Manufacturing in Guelph, Ontario, Canada 
>will still do custom orders for plate transformers etc.  They also 
>still maunufacture a filament transformer for the 4-1000 (model 167V7 
>...7.5 volts @21 amps...I have 2 at home that i purchased this year) 
>and for  many other tubes as well.  HV plate transformers are no 
>longer part of their bread and butter as they once were though,  so 
>they are a definitely a custom order.
>
>Avatar Magnetics (see ARRL handook for phone #) is another source.
>
>I'd suggest anyone living near a big city check the yellow pages.  
>There are usually a few small father-and-son type transformer shops 
>listed that will do one-of-a-kind jobs.  But since a HV plate 
>transformer for linear amplifier use (usually with C input filtering) 
>is a fairly uncommon beast for these guys,  you may have to do some of 
>the specifying for them.  They'd likely wind a 1 amp secondary with 
>#32 wire based on present standard practice for current densitys in 
>transformers.  It'll be up to you to know that the peak secondary 
>current will probably be more like 4 to 6 amps with a 1 amp load.
>
>Since the canadian dollar is low and american transformers are 
>therefore ridiculously expensive,  I've embarked on winding my own HV 
>transformer(s) ...after studying the subject for approximately 6 
>months, touring a couple of facilities and speaking with designers 
>from a few companys.  Core laminations (E-I and cut 'C' cores) have 
>been sourced and I should be ready to do my first prototype soon.  If 
>it doesn't go well,  you likely won't see me mention it again.  If 
>(when) I produce a decent unit,  I may consider taking the occasional 
>order.  Right now,  this is just a hobby project - it's a lot of work, 
>but it's still fun.
>
>Phil   VE3OZZ


Now thats some GOOD information Phil, tnx for sharing it. I would also be
interested in discussing some custom work with you.

The last I checked, Hammond filament xfmr prices were much lower than
Dahl.

73  Carl  KM1H

___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]

--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm