Michael (G7SOE) wrote: You are just as big a hardware squirrel as I am! :-)> (If it's boxed and labelled and for a type of set I have, I tend to acquire spare parts "just in case", because they're cer

John (G4DXY) wrote: He did, and I think I bought a couple. (Finding them may be another matter entirely.) I'll take a look. Chris. (G8KGS)

David Dunlop wrote: Hum on the timebase (or X amplifier output)? If the line is straight, rotate the CRT? :-)> It certainly sounds like you're getting there with it. Best regards, Chris. (G8KGS)

James wrote: The spare parts case contained 12 fuses (as well as spare lamps, dynamotor brushes and a lot of spring clips, clamp screws and other parts that might wear out or be dropped into the bowel

Bruce (M4SOE) wrote: The LT fuse (10 amp, blue band) on supply unit no.2 is only for the vibrator, the dynamotor has no input fuse and a considerable starting current (it's compound wound, I think, bu

James wrote: Both HT fuses are 250 mA , 1.1/4 inch, 250 volt fast blow types. Their function is to protect the dynamotor windings against a short circuit in the set which could destroy the supply unit

Re: [wireless-set-no19] Capacitors in PSU No.2 (Canadian) Iain (G0OZS) wrote: Might be due to damp, but they probably can't be 'dried out' by any sensible method. Be careful with that one: it's there

eBay item 312906665115 which is claimed to be a Canadian Mk.III by Northern Electric (C78444), but is definitely a British Mk.3 from the knobs, the lack of Flick Adjuster and sundry other clues. Chris

Keith wrote: I'll have a rummage. I'm sure I've got some used ones somewhere. (That new one with the heater/cathode insulation problem is presumably no good?) Indeed: a Merry Christmas to all our memb

Re: [wireless-set-no19] RF Thermo Ammeters Test At 14:20 +0000 21/12/19, Pete_G4GJL wrote: I'd forgotten about the width of the contact between the thermocouple and the heater wire, so if using DC it

Pete (G4GJL) wrote: The usual method of destroying thermocouple and hot-wire ammeters is applying a 'D' cell across the terminals (before I could say STOP!) the pointer moved OK (well, rather quickly)

Andy Jackson (G8JAC) is another night owl! (I thought I was the only one awake at Oh God o'clock - just back from London at 0055Z.) A rather more detailed answer than I cobbled together. Best, Chris.

Brian Blackwell wrote: I may have a spare cable. I do have several spare matching units, but am looking for the ATU itself. Because it would complicate the aerial tuning from the operator's point of v

Re: [wireless-set-no19] 2nd Lt J R R Tolkien; Signals Offi Clive wrote: http://www.royalsignals.org.uk/ (Due to massive abuse in the past, it's restricted to 6 documents in a rolling 14-day period. Ju

Re: [wireless-set-no19] 2nd Lt J R R Tolkien; Signals Offi Clive, which book do you have? (If it's Instruction in Army Telegraphy and Telephony, then it's in the archive and there's no need to risk sc

Re: [wireless-set-no19] 2nd Lt J R R Tolkien; Signals Offi Sean Kelly wrote: That's just a crystal set (though there was an add-on valve detector (SCR-55) made for it. Receive only. The early aircraft

Woodie (K1UAX) wrote: I'd suggest finding out the frequency of the 'sideband' signal by measuring the carrier frequency for two adjacent nulls and comparing that with the BFO frequency on transmit. (A

Re: [wireless-set-no19] 2nd Lt J R R Tolkien; Signals Offi Clive (F5VHS) wrote: (snip happens) If you mean "Instruction in Army Telegraphy and Telephony", the archive has both editions of Volume 1 (In

Seamus wrote: Doc 5104 in the archive is a bound copy of 'Notes on Field Telephony' from Farnley Park in 1917, so that may be helpful. Probably (this is an educated guess on my part), Telephone Sets C

Ian (GM0UHC) wrote: Ouch! Er, "across the arms" is the most dangerous path, hence the advice to keep one hand in your pocket. (I think AC might be more hazardous than DC or a single spike of short dur