Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: bruno on November 14, 2011, 04:10:14 pm

Title: Looking at edcor products for an OT for 4xel84... I found this?
Post by: bruno on November 14, 2011, 04:10:14 pm

I was looking at edcor products for an output transformer (up to 30w) that would work with 4xel84 output section or a 4xel34 cathode biased output section, with really low plate voltages (close to 230-240v).

I found these:

http://www.edcorusa.com/products/435-cxpp30-ms-6_6k.aspx (http://www.edcorusa.com/products/435-cxpp30-ms-6_6k.aspx)
http://www.edcorusa.com/products/434-cxpp30-ms-5k.aspx (http://www.edcorusa.com/products/434-cxpp30-ms-5k.aspx)

one has a 5k primary and the other a 6.6k, 5k or 4k would be nice for the 4xel84s, I guess I'll need a 2k primary for the 4xel34s. However these OTs appear to be ultralinear from the schematics presented, can anyone confirm this?

Title: Re: Looking at edcor products for an OT for 4xel84... I found this?
Post by: Willabe on November 14, 2011, 04:46:46 pm

Quote from: bruno on November 14, 2011, 04:10:14 pm

However these OTs appear to be ultralinear from the schematics presented, can anyone confirm this?

Yes they are. It list's them as -- screen grid taps @ 40% -- .

You don't have to hook them up. Some guys like to use the UL taps instead of feed back. Dr. Z does this on a few of his amps.


               Brad       :icon_biggrin: 

Title: Re: Looking at edcor products for an OT for 4xel84... I found this?
Post by: PRR on November 15, 2011, 12:10:32 am

CXPP25-MS-4K
 25W, push-pull tube output transformer for 4K Ohms to 4, 8 and 16 Ohms.

Title: Re: Looking at edcor products for an OT for 4xel84... I found this?
Post by: bruno on November 15, 2011, 03:45:43 am

thank you PRR