Hi
I have a "Fisk Radiola Mantle Set" I am trying to restore, the paper Capacitor .05 M.F. 600V DC is faulty, also noticed that when the set was switched on for about 30 Seconds, a blue flash came from the 6X5GT valve, can I purchase another Valve, or can I sub. it for another type valve? and can I replace the leaking Capacitor, with another type. Example: 1MF 450 Volt Electrolytic.
As I have no Wiring Diagram, can anyone help me with a copy. The Serial No. is C0072102
Maany thanks Johno.

Capacitors (condensers) should only be replaced with the same type and rating. The modern equivalent of a papercap is the small yellow polyester variety - use the same rating and working voltage or as close to it as possible. Steve Savell (savell.combigpond.com) sells these caps in small or large quantities for a fair price.

Installing a cap with a lower voltage rating or a much higher capacity will cause lots of problems. The cap could blow up, showing the innards of the radio in foil and wax paper or cause an overload to a valve - the horrendous outcome just depends on where the incorrect capacitor is installed.

Whilst it is sometimes possible to substitute valve types I don't recommend it. It creates confusion and in some cases complacency. There's plenty of 6X5's around.

To help with getting the right circuit diagram to you we would also need the model number of your set. AWA usually stamped this on the back of the chassis in ink.

a blue flash came from the 6X5GT valve

Internal shorting is a deficiency of the 6X5 design, which has always struck me as odd given that it was purportedly invented for use in car radios.

In your case the problem may be associated with that bad capacitor if it's part of the HT filter circuit.

As Brad says, the 6X5 is common enough so you'll be able to get a replacement, but address any bad components before powering up again.

Hi Brad & GTS.
I'm new to this Forum,so I hope that I am doing the correct thing. Many thanks to you 2 Guys for your help, hope that you can supply me a copy of the Wiring Diagram the Serial No. is as follows:C0072102, and yes will have to check all components before I continue, that is why I would like the Wiring Diagram. Please can you advise me per E Mail the cost for the copy if possiable to johnshackbigpond.com
Many Thanks
Johno.

Hello Johno

Below is a link to a site that describes repairs to old valve gear

http://www.ling.mq.edu.au/~robinson/Information/Repairing_Valve_Technology/

A good thing about this site is that it gives good tips for a lot of those little niggling problems that always come up in jobs like this.

Good luck

hope that you can supply me a copy of the Wiring Diagram

AWA produced a number of "Fisk Radiolas". I may be able to provide you a schematic, but I need the actual model number (serial numbers don't help in that regard). As Brad mentioned, AWA usually ink-stamped the model number on the back of the chassis. Can you see one?

It would also help to know the valve line-up, that is, all of the valves in the set. Also, is it broadcast band only, or short wave as well?

I am going to have a wild guess here. The only Fisk Radiola that comes to mind with GT valves would be the R92 of 1940, also known as the Egg Crate because of the style of grille. The same model was sold, badged as a Radiolette after World War II.

Hi GTC & Brad.
The Fisk is the same that was sold via. E Bay last week it sold for $660.00. This is what I can see on my set, the serial No. is stamped on the back chassic & painted red. the position of the Valves are as follows: 6A8G,- 6G8G,- 6V6G,- 6X5GT, the front Dial - "AWA THE FISK RADIOLA"
Stations are as follows: "Top. to Bottom". NSW, VIc.- Tas., Qld.- NZ., SA.- WA., also Brad, I can see with a Mag / Glass the serial No. of the set sold by E Bay is C0084183 so I beleive that my set is a earlier model?. this Radio also has a switch on the Right Hand side of cabinet Hope this helps.looking fordward to receive a Schematic,& yes it a Broadcast Band only.
Johno.

Hi Brat.
This may help, I have noticed on back of this "Fisk Radiola "is labeled a R9 something, as part of the Model No. have been rubbed off. so I maybe a R92?.
Johno.

If your tuning dial is at the bottom of the set and is angled at around 45° then I think we've hit the jackpot.

The Fisk is the same that was sold via. E Bay last week it sold for $660.00.

That's the "egg crate" model that Brad alluded to.

the Valves are as follows: 6A8G,- 6G8G,- 6V6G,- 6X5GT

I don't recognise R92 as a model designation among my data, however that valve line-up in AWA broadcast mantel sets gives these models for 1946:

500M
500MY
506M

Hi Brad,
Many Many thanks for your help "YES" the tuning Dial is at the bottom of the chassic & at 45 Deg.
at last i'm getting someware, if possiable can you send me a copy of this radio's Schematic to johnshackbigpond.com if you can you will make my Day. Also to all the other People that has helped me
Johno.

Re: "THE FISK RADIOLA"
It appears that I should have asked GTC for the Schematic Diagram of my set that i'm trying to restore, as you know, I have repeatedly given the Serial No. of the above Radio. I am desperate to get hold of a Wiring Diagram of this Model. as I have not heard from Brad or GTC, can anybody else help me.
Many thanks.
PS: here again is the Serial No. C0072102. Johno.

G'day John,

I believe I have the circuit but no way to scan it at the moment. As we now know the model number it will be possible to do this but I would need a few more days. The serial number on its own would not have helped unfortunately.

Once I have scanned the circuit I will add it to this thread.

I believe I have the circuit but no way to scan it at the moment.

Where's it published? I don't have anything filed as "R92".