Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: MWaldorf on September 21, 2020, 01:43:56 pm

Title: "Doug Circuits" VOX AC4 Ver.3 - transformer recs?
Post by: MWaldorf on September 21, 2020, 01:43:56 pm

I'm thinking of building this AC4 variant.  Does anyone have a recommendation for a power transformer or the 4H choke? 

Also, while the OT is listed as TF103-48UL (for a Champ I think) I've already got a P-TF22913 OT from a Princeton Reverb clone.  The primary and secondary impedances are listed as the same, just more power handling in the PR OT.

Link to thread about circuit: https://el34world.com/Forum/index.php?topic=21346.msg226421#msg226421 (https://el34world.com/Forum/index.php?topic=21346.msg226421#msg226421)

Thanks!

(https://el34world.com/Forum/index.php?action=dlattach;topic=21346.0;attach=62843;image)

Title: Re: "Doug Circuits" VOX AC4 Ver.3 - transformer recs?
Post by: shooter on September 21, 2020, 02:12:25 pm

here's a quick search, little hotter than the one in schematic, but should work;


https://www.edcorusa.com/xpwr013 (https://www.edcorusa.com/xpwr013)


once there, you should be able to follow the site to inductors also

Title: Re: "Doug Circuits" VOX AC4 Ver.3 - transformer recs?
Post by: PRR on September 21, 2020, 02:25:45 pm

> OT is listed as TF103-48UL (for a Champ I think) I've already got a P-TF22913 OT

One is for single-ended, the other for push-pull.

Title: Re: "Doug Circuits" VOX AC4 Ver.3 - transformer recs?
Post by: MWaldorf on September 22, 2020, 03:14:46 pm

thanks guys!