thebadtall
Full Member level 6
Hello !!
I found some old transformers (with the good old transformers) 500ma 9v and 7.5v ac
![9v7.5vacb2b.jpg 9v7.5vacb2b.jpg](https://www.edaboard.com/data/attachments/23/23230-a0660dfb9f21f08fad69f59457fd4da5.jpg)
wich back to back gave me 240vAC
and thought to use them and build a 4 tube preamplifier with around 300vDC B+ voltage.
but i dont know why, after the rectifier bridge, wheres the high voltage ? ? ? ? ?
look:
![9v75v-35vdc.jpg 9v75v-35vdc.jpg](https://www.edaboard.com/data/attachments/23/23231-216d97c0b706987d513489ce162bdea8.jpg)
i did not use capacitor. can you tell me why there is so huge drop ?
because of the low power of transformers?
any suggestions to get >200v DC with those two ?
I found some old transformers (with the good old transformers) 500ma 9v and 7.5v ac
![9v7.5vacb2b.jpg 9v7.5vacb2b.jpg](https://www.edaboard.com/data/attachments/23/23230-a0660dfb9f21f08fad69f59457fd4da5.jpg)
wich back to back gave me 240vAC
and thought to use them and build a 4 tube preamplifier with around 300vDC B+ voltage.
but i dont know why, after the rectifier bridge, wheres the high voltage ? ? ? ? ?
look:
![9v75v-35vdc.jpg 9v75v-35vdc.jpg](https://www.edaboard.com/data/attachments/23/23231-216d97c0b706987d513489ce162bdea8.jpg)
i did not use capacitor. can you tell me why there is so huge drop ?
because of the low power of transformers?
any suggestions to get >200v DC with those two ?