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westcliff · 21st Sep 2011, 11:38 pm

Thank you Neil and Sideband for your comments, they are very helpful.

The 3-amp fuse is okay and the resistance on the mains lead between L and N is 162 ohms. I checked my other FB10 and got 171 ohms, so 162 would seem to be acceptable for this model.

While I was checking the mains transformer (142.5 ohms), I saw that a resistor had become detached from its wire. The resistor is R13 I think (the Trader sheet is not clear), and it should have a value of 113 ohms. This one, when removed, measured 9.5 ohms. It is the rectifier's surge limiter and is situated on top of the chassis, between the 6V6 output valve and the aerial.

Can this be the source of my problem, or another sympton? It will have to be replaced in any case. I don't know the power rating of the resistor, but I could use a 5-watt 120 ohm one, or 2 x 5-watt 250 ohm in parallel, for 125 ohms. Would either or both of these be suitable?

Thanks again.

Gus.

21st Sep 2011, 11:38 pm	#18
westcliff Hexode Join Date: Jan 2011 Location: Essex, UK Posts: 397	Re: KB FB10 "Toaster" Thank you Neil and Sideband for your comments, they are very helpful. The 3-amp fuse is okay and the resistance on the mains lead between L and N is 162 ohms. I checked my other FB10 and got 171 ohms, so 162 would seem to be acceptable for this model. While I was checking the mains transformer (142.5 ohms), I saw that a resistor had become detached from its wire. The resistor is R13 I think (the Trader sheet is not clear), and it should have a value of 113 ohms. This one, when removed, measured 9.5 ohms. It is the rectifier's surge limiter and is situated on top of the chassis, between the 6V6 output valve and the aerial. Can this be the source of my problem, or another sympton? It will have to be replaced in any case. I don't know the power rating of the resistor, but I could use a 5-watt 120 ohm one, or 2 x 5-watt 250 ohm in parallel, for 125 ohms. Would either or both of these be suitable? Thanks again. Gus.