Ondolina 28 2nd gen.

• This is the first SBR radio where the tubes are not visible on the outside.
• The retail price is without the tubes.
• There are 3 models Ondolina 28 known to exist:
  • Generation 1: has a feedback¹ regulator, no volume switch, and the switch for the scale lamps is just under the lid;
  • Generation 2: has a feedback¹ regulator, has a volume switch, and initially the swith for the scale lamps is still just under the lid, then later it is on the frontpanel;
  • Nouveau modèle: has a feedback¹ regulator and volume regulator. The switch for the scale lamps is on the frontpanel, jack for a pick-up at the back.
• All generations are fed via connectors on the backpanel with a 4V and a 120V (storage) battery.
• A separate internal battery for negative grid voltage is always present, even when fed with a power supply.
• There is an alternative tubeset: HL410, 2x L410, P425.
• The radio could be used with a M30 power supply, but also with a M35 power supply when it was converted to be used with a Réseau² tubeset E430, E409 or E415, E415, B403 or B405.

• ¹ Feedback = reaction (regenerative principle).
  ² Réseau tubes: from the French word "Réseau" = powergrid. Tubes that can be heated with AC current in contrast with battery tubes that are heated with DC current.

Donde encontrará 711 modelos, 659 con imágenes y 384 con esquemas.
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