[sdiy] Tube question 1: transformers

[Czech Martin]

This trafo might be suitable:

http://www1.conrad.de/scripts/wgate/zcop_b2c6e1b7cd8/~flNlc3Npb249UDkwV0dBVEU6Q19BR0FURTA0OjAwMDAuMDIxZi5hYWVkZTkwYiZ+aHR0cF9jb250ZW50X2NoYXJzZXQ9aXNvLTg4NTktMSZ+U3RhdGU9Mjk1MDUyNzMz====?%7Eevent=display&%7Etemplate=PCAT_AREA_S_BROWSE&p_page_to_display=aufriss&SPEC_AREA_GUID=8CC92F3E4CD4C2CEE10000000A010251&x=17&y=6

at www.conrad.de there is a 100V, 10W transformer.
Maybe it has two primary windings, the text is not too clear.

Rene, thanx for the hint.

m.c.

> -----Original Message-----
> From: René Schmitz [mailto:uzs159 at uni-bonn.de]
> Sent: Donnerstag, 28. August 2003 13:12
> To: Czech Martin
> Cc: Sdiy (E-mail)
> Subject: Re: [sdiy] Tube question 1: transformers
> 
> 
> Hi again,
> 
> > I found that output and PSU transformers for tubes
> > are quite expensive, arround 70 EUR.
>  >
> > Is this shameless abuse, or justified pricing
> > for low volume production?
> 
> The production is not mechanized, and involves many
> manufacturing steps, as the windings are "interspaced"
> (verschachtelt). Thus the labor cost is dominating the price I think.
> But this doesn't mean you could wind your own for that price. Simply 
> because you can't get the materials in the small volumes you need. So 
> you end up buying a whole spool of wire, costing you more than the 
> transformer if you buy it.
> 
> Still I think for what you're after you should try one of those ELA 
> transformers. The inductivity would be ok, just these aren't 
> interspaced. (It will maybe only go to 10kHz, but what the heck, the 
> speaker won't reproduce that anyway.) A smaller core will faster 
> saturate, since that is what you're after it doesn't make 
> sense to use a 
> bigger core one to avoid that. (I think you won't be able to saturate 
> the usual HiFi transformers with that EL95 tubes, because 
> there is not 
> enough current.)
> 
> Cheers,
>   René
> 
> 
> -- 
> uzs159 at uni-bonn.de
> http://www.uni-bonn.de/~uzs159
> 
> 
> 
>