ONDOLINA 26 eigenaardig schema uitleg gevraagd aub (Algemeen)

door Thierry Magis , east Belgium, 09.10.2008, 17:49 (5890 dagen geleden) @ John Hupse †

Hi John,

I've drawn this schematic when I repaired mine.

After that, i've discover one original SBR schematic, it's almost the same. On the SBR drawing there is no variable resistor to adjust heaters voltages...
I can scan this old schematic (dated june 26, 1924 - original SBR paper) but the quality will be poor. It's the schematic of the first Ondolina models (there is a few evolutions betwen 1924 and 1928)

You can trust my schematic about the wiring around the 2 first tubes. I've compared with the original, and don't make any mistake when drawing!

I recently found a second Ondolina (one of the last ones produced), and the schematic still remains the same... Except for the supply, on the last models there was no internal 4.5V battery for the negative grid voltage.

And my Ondolina works very well... like that !

Regards,
Thierry
http://www.radiocollection.be