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oldest Ondolina source: advertisement of September 1923
The devices contain no nameplate.
(In some cases there is a serial number available.)
Only the name of the device: Ondolina or Tubantia or
is visible in a logo.
To distinguish between the different Ondolina models,
these were listed by age and assigned a number for the various
Ondolina (model of l1924 = first generation)
8 Ondolina 49
Ondolina-modified (changed to the standard of 1926) 111 Ondolina
in the SBR museum
261 Ondolina 304 Ondolina
number of produced Ondolina’s: model of 1924 = first generation
304 - MAXIMUM 563
(SBR catalog of 1928/01/01)
number of produced Ondolina’s: model of 1927 = second generation
(* from advertisement below)
you have seen the benefit of a registration
Tubantia receivers with external tubes.
> So the more serial numbers
you make available to me,
the more accurate my review of Ondolinas will be.
May I ask you
for my research
production numbers of SBR
Where can you find the SERIAL NUMBER?
into the two round holes
from the removed lamps; just between
the two lamps you might see a number.
and right out of the case;
the receiver out at front
at the metal
baseplate a number might be visible,
behind the horizontal metal cylinder.
detail of the
the bottom of the case of the receiver (mid back)
may see a number on an aluminum plate sometimes.
Note: Check the
second as well as the third method, as they may provide different
In that case the cabinet does not originally belong to the receiver
Only the number at the chassis is than meaningful.