A question about other power transformers in the 4S preamp.
The one specified in the design is Hammond 269EX. In another subforum "Super Simple single stage tube preamp"
here
viewtopic.php?f=9&t=3266&start=320#p36812 , in response to another poster Matt said this ......
Quote:
RossD wrote:
The tube depot has a power transformer that looks, to me at least, to be a perfect match:
http://tubedepot.com/tr-pw-13.html Personally, I would spend the extra $2.51 and get this one (
Edcor XPWR136-120) instead. The voltage is higher and center tapped, it supplies up to 60mA so current is no problem, and it has lots of 6.3v filament current. This is my "go-to" transformer for small tube circuits of all kinds. I would also bet that the quality is a lot higher than the one from Tube Depot. There is also this one (
Edcor XPWR164-120) for just $7.08 more if you wanted to use a 6CA4 rectifier (with the separate 1A dedicated filament winding).
Just my opinion but I really like Edcor transformers (both output and power).
_________________
Matt
http://www.edcorusa.com/xpwr136 http://www.edcorusa.com/xpwr161 So, would either of those power transformers be a suitable choice for the 4S preamp ?
In both cases the secondary voltage is higher the Hammond 269EX so maybe resistors and/or zener diodes will have to
be used to reduce the voltage.
I'm asking because later on I'll be getting some Edcor transformers for another project and I could get one of these in the
same order.
I also have a preference for Edcor transformers relative to the Hammonds.
.