21-05-2023, 08:06 PM
AFIAK there are no schematics for any Bush Ireland (only) Models. Irish & UK sets diverged in 1954/1955 due to UK starting VHF-FM, which was 1961-1962 in Ireland.
There is nothing that really needs the schematic in most AM only valve sets unless a component is so badly damaged it can't be identified. Even than many parts likely to need replaced are not critical or similar to similar sets.
Unusually the Magic Eye is UM4 rather than EM34.
Strangely it's AC only and isolated using a mains transformer despite U type series valves, but some EBS35 models are rumoured to have E type parallel valves. It's not impossible that both versions of the BS35 exist.
I believe it's identical to the EBS35, except with LW instead of 11m band SW, but that's an Export model, thus no schematic.
I think I have restored 2 or 3 now and gave mine away. Just the usual job of replacing all the paper dielectric caps. I only bother looking at anything else if performance is poor.
Don't bother with a lamp limiter. Those are really most value for TVs and some direct mains series models. Just don't power it up, but replace the paper dielectric caps (mostly 1nF to 0.47uF in general) with nearest value (39nF for 0.04 uF etc) and 250V or 400V metpoly or similar. Maybe 2KV ceramic if any cap on final anode / output transformer (so called Tone Correction, a snubber).
I reform electrolytics with a 30V bench PSU current limited, in situ, with valves and mains disconnected.
There is nothing that really needs the schematic in most AM only valve sets unless a component is so badly damaged it can't be identified. Even than many parts likely to need replaced are not critical or similar to similar sets.
Unusually the Magic Eye is UM4 rather than EM34.
Strangely it's AC only and isolated using a mains transformer despite U type series valves, but some EBS35 models are rumoured to have E type parallel valves. It's not impossible that both versions of the BS35 exist.
I believe it's identical to the EBS35, except with LW instead of 11m band SW, but that's an Export model, thus no schematic.
I think I have restored 2 or 3 now and gave mine away. Just the usual job of replacing all the paper dielectric caps. I only bother looking at anything else if performance is poor.
Don't bother with a lamp limiter. Those are really most value for TVs and some direct mains series models. Just don't power it up, but replace the paper dielectric caps (mostly 1nF to 0.47uF in general) with nearest value (39nF for 0.04 uF etc) and 250V or 400V metpoly or similar. Maybe 2KV ceramic if any cap on final anode / output transformer (so called Tone Correction, a snubber).
I reform electrolytics with a 30V bench PSU current limited, in situ, with valves and mains disconnected.
