Superia Radiogram - UK Vintage Radio Repair and Restoration Discussion Forum

Paulinnes · 2nd Mar 2021, 8:30 pm

Hello I’m looking for circuit diagram or help with this radiogram.
Model, Superia made by Europhone.
It’s made in Italy.
It has not been used for years, I’ve powered up from a variac, but the dropper resistor is overheating badly. It’s has a modification made, looks many years ago. The rectifier valve is missing and a diode modification has been done.

A circuit diagram is needed.
I am a Tv engineer since 1982, I’m ok with valves, more tv than radio, my old boss always got them jobs.
But nowadays one has to diversify, going back in time.

Thanks all
Paul

paulsherwin · 2nd Mar 2021, 9:04 pm

Are you sure it's designed for 240V mains?

Overheating droppers normally mean a short circuit, as they just supply the valve heater chain.

Nuvistor · 2nd Mar 2021, 9:25 pm

RadioMuseum have a circuit for a Superia radio, if it’s the same chassis inside your radiogram it may help.
https://www.radiomuseum.org/r/europh...erla_rc62.html

List of other Europhon sets.
https://www.radiomuseum.org/m/europhon_i_en_1.html

MALC SCOTT · 2nd Mar 2021, 9:48 pm

It could be dust on the dropper.

2nd Mar 2021, 8:30 pm	#1
Paulinnes Diode Join Date: Mar 2020 Location: Northumberland, UK. Posts: 3	Superia Radiogram Hello I’m looking for circuit diagram or help with this radiogram. Model, Superia made by Europhone. It’s made in Italy. It has not been used for years, I’ve powered up from a variac, but the dropper resistor is overheating badly. It’s has a modification made, looks many years ago. The rectifier valve is missing and a diode modification has been done. A circuit diagram is needed. I am a Tv engineer since 1982, I’m ok with valves, more tv than radio, my old boss always got them jobs. But nowadays one has to diversify, going back in time. Thanks all Paul

2nd Mar 2021, 9:04 pm	#2
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,934	Re: Superia Radiogram Are you sure it's designed for 240V mains? Overheating droppers normally mean a short circuit, as they just supply the valve heater chain.

2nd Mar 2021, 9:25 pm	#3
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,431	Re: Superia Radiogram RadioMuseum have a circuit for a Superia radio, if it’s the same chassis inside your radiogram it may help. https://www.radiomuseum.org/r/europh...erla_rc62.html List of other Europhon sets. https://www.radiomuseum.org/m/europhon_i_en_1.html __________________ Frank Last edited by Nuvistor; 2nd Mar 2021 at 9:43 pm.

2nd Mar 2021, 9:48 pm	#4
MALC SCOTT Octode Join Date: Aug 2006 Location: Willington, County Durham, UK. Posts: 1,499	Re: Superia Radiogram It could be dust on the dropper. __________________ Malc Scott