I picked up a Music Masters 'Wagner' 1940-41 console radio in poor condition. The ARTS&P prefix is 'G' so should be 1941 - 1942. There are no other markings that I can see. It is missing a (double diode triode?) valve and I can't find a circuit diagram for the set. The valve line up (from the valves in the set): 5Y3G, 6V6GT, 'missing valve', 6U7G, EK2G. The missing valve has a grid cap on top.

Can anyone help with a diagram or just the missing valve assuming the others are correct.

Thanks, David

I have very little info on Music Masters prior to the 1950s. The only line-up that comes kind of close to what you have is the 1940 'Mozart' mantel:

5Y3G, 6U7G,EK2G, EBF2 (Double Diode-Pentode, top cap, but P8A European base), EL3G (Power Output Pentode, octal base)

Thanks GTC, All mine are octal bases. Really! a Mozart! I found a Beethoven for 1940 too but no diagram.

I did find a diagram for the A4 model from 1948 in the AORSM and it shows the same lineup as mine and the missing valve is a 6SQ7 but the 6SQ7 doesn't have a top cap. It also references the Mozart in the A4 diagram.

The model A4 is 8 years later than mine and there is a gap in production I assume for the war. I believe the 6Q7 is the predecessor to the 6SQ7 and it has a top cap so maybe they used that in mine.

I'll have to try and nut out the circuit in my radio and compare it to the A4 circuit I guess ...after I chip all the rust off

I believe the 6Q7 is the predecessor to the 6SQ7 and it has a top cap so maybe they used that in mine.

Pinouts differ for heater and cathode. What pins are the heater on in your chassis?

Additionally, if you can determine the actual pinout on that socket we should be able to list candidate valves.

Just noticed the circuit in the AORSM pg 274 for the A4 has the 4 valve A4 circuit and another 5 valve circuit on the lower half, I don't know what that circuit is for but that's what I have been going off.

another 5 valve circuit on the lower half, I don't know what that circuit is for

It's labelled model A5.

Tip the chassis over and let us know the pinouts on the mystery socket (as mentioned above).

I had a look at Arthur Cushens list & see no reference to EK2G in a Music Master?

We are looking at war years where all sorts of things happened & circuit changes to Philips valves were common plus reverting from Octal back to the pre octals like 6D6 instead of 6U7. Mullard 84 & Philips 2652 used a similar line up with EK2G, & Philips used that valve quite late.

Now is it the right valve? A clue will be pin 1 grounded & if its not all hell usually breaks loose with a Philips valve: That's the shield. Superseded by EK32.

Now is it BC only or BC/ SW (DW). EK2G is an Octode like 6A8. By this time 6J8 (Triode Heptode) superseded 6A8 in shortwave sets which often also used ECH35 in SW.

Missing valve could be 6B6G but of course check the pinout with the actual wiring.

Checking pinout is important 6B6 and 6B8 can be found "accidentally" subbed, as can be 6G8. The difference being pin 6.

6B6 is a Triode Double Diode. Pin 6 is NC. The others are Pentode double diodes. Pin 6 is the screen and is likely tied to the screen of the Pentagrid. The danger is that if it was the Triode & it gets the Pentode in that hole, someone may have used pin 6 as a tag of convenience & then there is a problem.

My normal procedure where there is no circuit, is to form the layout & add Octal sockets all with the autoCAD Then print & play join the dots, & get a circuit that way.

Then there is the chance that you will often find who built it. AWA was but one that badge engineered.

I had a look at Arthur Cushens list & see no reference to EK2G in a Music Master?

Who is Arthur Cushen?

Music Masters,1940, Model P, AC DW Man, 5 valves, IF=472.5, 5Y3G, 6U7G, EK2G, EBF2, EL3G.

Think I got the name wrong: Its Courtney. After leaving IBM he started Resurrection Radio & made an extensive list of early Australian Radio Brands and another of early Australian radio sets. The latter lists the valve line up and number of them etc.

Very handy reference.

Hi All, thanks for the replies.

Talking to other experts in the field one who has a similar Wagner set have suggested it is a 6B6G and the EK2G is correct. I checked the pinouts and they suit a 6B6G so pretty confident that will be correct. It's also listed on Radio Museum as being similar to a 6SQ7GT but with different connections.

Robbbert... Thanks, I hope you are right

Marc... I checked pin one on the EK2G and it's grounded.

GTC... I see the A5 in the AORSM now, I looked at that circuit for an hour and didn't see the A5 heading below the A4. I realise now the 4 and 5 refer to the number of valves (head slap)

For interest and future reference the pinouts are:
1 = NC
2 = Earth (Heater)
3 = Anode
4 = Diode
5 = Diode
6 = NC
7 = Heater
8 = Cathode
Cap = Grid

Thanks all for your help