10-01-2016, 10:44 AM
Might it be listed under its Ekco equivalent? For example the Ferranti U1103 is on Trader 1657, nominally for the Ekco U428. Might this be similar enough to make a start? These late 1950/early 1960s AM/FM sets were often very similar in design.
The U1003 is almost certainly on an ERT sheet but I don't have an index. The U1003 is on Rmorg if you're a member: http://www.radiomuseum.org/r/ferranti_u1003u_100.html The valve line up as seen there is the same as the U1103 so the circuits will be very similar. The schematic on the Rmorg site, as seen on the thumbnail (I'm not a member ) is from R&TVS so it must be in my collection somewhere.
The multiple overlapping series of books makes it very confusing but I've found it. It's in Molloy & Poole, 1957-1958 p100-102. There's a probable error in it, as the rectifier is stated to be a UY86 which I don't think ever existed. It's a UY85.
Now I've got the 2 circuits side by side I can see they are very similar. Not looked in detail but the U1103 sheet will be fine for basic servicing. Unless there's somethig awkward gone wrong then it's just repalcing the waxies and maybe a valve or 2.
I would also strongly recommend disconnecting the PU input. Very difficult to make this safe on an AC/DC set. C55 (on R&TVS circuit) must be repalced with a Class Y type, or better still, removed altogether along with the external LS socket.
The U1003 is almost certainly on an ERT sheet but I don't have an index. The U1003 is on Rmorg if you're a member: http://www.radiomuseum.org/r/ferranti_u1003u_100.html The valve line up as seen there is the same as the U1103 so the circuits will be very similar. The schematic on the Rmorg site, as seen on the thumbnail (I'm not a member ) is from R&TVS so it must be in my collection somewhere.
The multiple overlapping series of books makes it very confusing but I've found it. It's in Molloy & Poole, 1957-1958 p100-102. There's a probable error in it, as the rectifier is stated to be a UY86 which I don't think ever existed. It's a UY85.
Now I've got the 2 circuits side by side I can see they are very similar. Not looked in detail but the U1103 sheet will be fine for basic servicing. Unless there's somethig awkward gone wrong then it's just repalcing the waxies and maybe a valve or 2.
I would also strongly recommend disconnecting the PU input. Very difficult to make this safe on an AC/DC set. C55 (on R&TVS circuit) must be repalced with a Class Y type, or better still, removed altogether along with the external LS socket.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
