Rogers Tuner info needed

[FIXITNOW]

found info for SM1 used Tuner VALVES USED ARE 1 X ECC84, AND 3 X ECF80

[pwdrive]

found info for SM1 used Tuner VALVES USED ARE 1 X ECC84, AND 3 X ECF80

Damn, I was just about to suggest an ECC84 for the front end based on your pics.

Lawrence.

[FIXITNOW]

found a post on another radio forum where the guy has one and was looking for a circuit(sadly there was no reply)
but have PMed him asking about the valves and for pics of his unit
hopeful he may be able to help

[pwdrive]

found a post on another radio forum where the guy has one and was looking for a circuit(sadly there was no reply)
but have PMed him asking about the valves and for pics of his unit
hopeful he may be able to help

That valve line up sounds something like eg: pentode anode for ECF80 is pin 6 (EFxx pin 7) you could always fit the missing res/filter cap stick them valves in and see what happens.

Lawrence.

[pwdrive]

If you can't get a schematic you should be able to do some reverse engineering to get one, the chasiss doesn't look too complicated.

Lawrence.

[pwdrive]

Page 46 of this magazine gives a brief description of the valve functions of a Rogers switched FM tuner which could be similar to Vince's, the cathode follower theory seems to be born out:

http://www.americanradiohistory.com/Arch...959-03.pdf

Lawrence.

[FIXITNOW]

Page 46 of this magazine gives a brief description of the valve functions of a Rogers switched FM tuner which could be similar to Vince's, the cathode follower theory seems to be born out:

http://www.americanradiohistory.com/Arch...959-03.pdf

Lawrence.

good link thanks

[Keithstv]

Looks as if the main smoothing capacitor is missing as well. Presumably the wires by the large hole at the rear end should go to the missing cap.

Keith

[FIXITNOW]

Looks as if the main smoothing capacitor is missing as well. Presumably the wires by the large hole at the rear end should go to the missing cap.

Keith

yes it is will need to find a suitable one and find its value/voltage plus I guess there will be a resistor between the 2 plus ends
there are 4 wires so I guess it was isolated

[FIXITNOW]

Page 46 of this magazine gives a brief description of the valve functions of a Rogers switched FM tuner which could be similar to Vince's, the cathode follower theory seems to be born out:

http://www.americanradiohistory.com/Arch...959-03.pdf

Lawrence.

scan from the mag to save all downloading as a large file and so it is always here