09-12-2011, 02:02 AM
Models using AF11x transistors
The models using the later Mullard alloy diffusion transistors of the AF11x series, the Mk.II sets and the VTR103, etc have a common fault of developing internal short-circuits, usually between the emitter and shield connections. It is sometimes possible to cut the shield lead and restore functionality but this can also lead to an increase in noise or cause instability. Replacement of the defective transistor is therefore the preferred option, and the AF12x series transistors are recommended.
Production differences
A difference on the later models is the “B U S H” lettering on the front of the sets. On earlier sets the letters are made of solid metal plated with brass or chrome, later models however have plastic lettering upon which a chrome coloured coating has been applied. Unfortunately this coating commonly wears thin revealing the bare plastic beneath.
Further model variants?
The 15 model types given here may not be exhaustive and there may be other little-known variants out there. It has been speculated that there may be a TR82B set with an headphone socket using the modified A177 chassis and even a TR82B Mk.II set with the A349 chassis, though this set seems far less likely to exist than the former.
I hope this thread proves useful to anyone wishing to positively identify any of the Bush variants in their collection, and ultimately to serve as a source of reference on these models.
Kind regards
The models using the later Mullard alloy diffusion transistors of the AF11x series, the Mk.II sets and the VTR103, etc have a common fault of developing internal short-circuits, usually between the emitter and shield connections. It is sometimes possible to cut the shield lead and restore functionality but this can also lead to an increase in noise or cause instability. Replacement of the defective transistor is therefore the preferred option, and the AF12x series transistors are recommended.
Production differences
A difference on the later models is the “B U S H” lettering on the front of the sets. On earlier sets the letters are made of solid metal plated with brass or chrome, later models however have plastic lettering upon which a chrome coloured coating has been applied. Unfortunately this coating commonly wears thin revealing the bare plastic beneath.
Further model variants?
The 15 model types given here may not be exhaustive and there may be other little-known variants out there. It has been speculated that there may be a TR82B set with an headphone socket using the modified A177 chassis and even a TR82B Mk.II set with the A349 chassis, though this set seems far less likely to exist than the former.
I hope this thread proves useful to anyone wishing to positively identify any of the Bush variants in their collection, and ultimately to serve as a source of reference on these models.
Kind regards
