Re: Vidor CN426 HENLEY
It sounds as though there is no supply to the valve heaters. These appear to be series fed from the HT line via ballast resistors. Check these are OK ( R19 /R20 ) If so, suspect a faulty contact in one of the valveholders interupting the heater chain... this can be tested by measuring ohms, with power removed, from the "low" side of R19 to chassis. If missing here, switch to "BATT" and do the same test from the LT + battery connection - there may be problems in the mains/Battery switching.
Andy
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