American Bosch model 515. - Printable Version

+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Various and Sundry Categories (https://philcoradio.com/phorum/forumdisplay.php?fid=37)
+--- Forum: Other Radios (Non-Philco) (https://philcoradio.com/phorum/forumdisplay.php?fid=12)
+--- Thread: American Bosch model 515. (/showthread.php?tid=3520)

---

American Bosch model 515. - mickey1 - 07-28-2011

Audio output transformer has open primary. output tube is a 42 and schematic about 3 watts+/- of power. any suggestions as to what I need to replace the transformer :

---

Re: American Bosch model 515. - Arran - 07-29-2011

Pretty much any output transformer used with a another 42, a 6F6, 6V6,or even a 6BQ5 will work as a replacement, there are others of course but the plate impedance is pretty close between those tubes.
Regards
Arran

---

Re: American Bosch model 515. - mickey1 - 07-30-2011

thank you for advise--will do.

---

Re: American Bosch model 515. - Radioroslyn - 07-31-2011

Or if you want to live life on the edge you can use a 6.3v filament transformer. the 110v side goes to the plate circuit and the 6v side to the speaker.
Terry

---

Re: American Bosch model 515. - codefox1 - 08-01-2011

Agree with all, you'll get some audio if everything else is OK. Then you can fine tune it and get a proper transformer

---