Hi everyone i'm trying to locate a circuit and valve line up for a Batyphone Daventry dual wave console 240 volts made around 1935-36 if anyone can help I will appreciate it.

Thanks George

Would be an idea to list the valves, at that vintage it could well be a set with something like 2A7 and not a screen grid (Autodyne) radio?

I have had to resort to reverse engineering some sets of around that era, then play spot the faults.

Marc

Looks like a full compliment of P-base valves and what looks like a baretter - an odd inclusion for an AC receiver?

So, its C.S.Baty & Co Perth 1923 -1936 Listed in 1937 "Radio Trade Annual" as receiver manufacturers.
Horse traded in radio's, sold Eveready batteries & used AWA chasses post war.

Now we do need Valve numbers the barretter is possibly going to be C1 or C2 (Current Regulator) Perhaps an AK1 or AK2 in it etc

Now its to who's pattern & not many used Philips valves only. Speculation looks at the need for a Barretter.

I would say RF Amp, Then an Octode, followed by IF amp, 2nd detector then OP tube. Now where the hell is the rectifier if its AC. A baretter won't do it. An "AZxx" tube is likely for a rectifier.

The only reason for two paired gangs, of three gangs and no RF stage is if they used a Colpitts Oscillator. (Midwest did have some with Colpitts)

Powering this one is not to be considered. Wet caps will be U/S for starters.

Marc

The 3 valves I can read the writing are CP1,CB1,CK1 the other one I can't make out the number all of them are P base
Thanks George

the other one I can't make out the number

You could try the freezer trick: put the valve in the freezer for a while and when it comes out the warm humid air should form "dew" on the valve's surface. Sometimes the valve number will be made visible by that dew.

Or, breathe on it, the momentary moisture can make the number visible.

Or, hold the valve so light reflects from the surface, this can also show the number.

Breathing trick only works on clear glass, the correct angle of sunlight can also work.

CP1 May actually be CF1 Sharp cutoff Pentode 13V heater.

CB1 No listing as yet May also be CF1?

CK1 Is the Octode I was after. Also 13V heater

Now this is suddenly heading for 110V and a series string

So do we have a CL4 OP tube 33V ? and we are missing a rectifier like CY2 ? Or a 32V synchronous vibrator inside the pan?

If it is a series string all of the valves would have the same current draw ... gets weirder by the minute. That baretter may have more than one filament and is a really the crucial clue if we can identify it

My suspicion is missing bits & its AC/DC modeled on the 8Tube Philips 6723 or an Eclipse 576

This lot did customise sets.

On page 31 of Richard Rennie’s book, The Encyclopedia of Western Australian Wirelesses and Gramophones there is a picture of a Batyphone radio console set with the same dial.
The radio in the photo is in the Newdegate Pioneer Museum.

CS Baty made mostly battery sets for the farmers of Western Australia.
Perhaps your one was modified. I don’t think the mains transformer looks like it is from the late thirties.

CS Baty made mostly battery sets for the farmers of Western Australia.
Perhaps your one was modified. I don’t think the mains transformer looks like it is from the late thirties.

Now this is interesting. Western Australia had large chunks of 40Hz mains power in the few places it was available. The lower frequency meant larger transformers with big E's and I's to stop the windings overheating. Yes, that transformer is quite small and I am still perplexed as to the presence of the baretter. Perhaps this was a battery set and later modified for mains use.

Then again, the set may have been modified when it arrived in Victoria where 50Hz mains was available.

Some questions:-

Is the baretter still connected?
What are the output voltages on the transformer's secondaries?

I am still perplexed as to the presence of the baretter

Possibly a case of being stuffed in there by someone to fill an empty socket?

As we know, socket stuffing with anything that fits does happen with valve sets.

The chassis has been sent to me from WA so I can try and get it operational but it's proving a headache without a valve lineup and diagram.

Appendix 13 of Richard Rennie’s book, The Encyclopedia of Western Australian Wirelesses and Gramophones lists some Batyphone models. There is a listing for;

“1936-49, AC-DC Models, Dual & Triple wave receivers; early models used Philips type coated valves with their Barretter, Later models used 6.3V, 25v and 50v valves, some with No.7 Barretter. Cabinets & dials etc. same as battery models of the period.”

^ Good find Gary.