Hi Brad, have you any Info. Re; the Wiring Diagram yet.
Anxious to get this Vintage Radio going, I have doubts about the Black unmarked Capacitors, I know you Guys are very busy, however I hope that someone can help re the Schematic Diagram, I do beleive that Diagram to suit 609 Model from 1946 will do? has someone this wiring diagram.
Johno.
PS: can send picture of this Radio if needed.

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Johno

Brad published it in your original thread back on Nov 16th:

http://vintage-radio.com.au/circuits/awa-fisk-radiola-r92.pdf

Many thanks GTC, Brad was going to do more reserch re: this Model. He is trying to confirm how many Models AWA ended up making, I received the wiring Diagram from Brad, however it was not the correct one. His Diagram showed a 5Y3G rectifer Valve , mine had the 6X5GT so I cannot restore this set until I have the correct Schematic. Have not heard from Brad since the 26/11/11. I can understand that you Fellows are very busy, so please try for me to be able if possiable get the correct wiring Diagram.
Johno.

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Johno

This is definitely a complicated case, as AWA used this chassis in several different models over a fairly long period of time.

The chassis is stamped to allow for five valves and despite the notion that the R92 Radiola was a four-valver, the chassis layout diagram inside the cabinet on my receiver clearly shows a five valve circuit, including a 5Y3G rectifier.

Despite this, my chassis is exactly like John's - a four valve set with a 6X5GT rectifier. I've checked the circuit and it is indeed wired to suit the 6X5GT's indirectly heated cathodes.

My receiver was last repaired by Telefix, ironically a company that is now owned by AWA. My guess is that the last repair was the decommissioning of the large chassis-mounted condenser and replacement with a small equivalent under the chassis.

Unfortunately the AORSM manuals I have (Volumes 1 - 11) appear to only include the circuit diagram with the 5Y3G fitted. Though what is common knowledge is that this receiver was made both before and after WWII, being one of only two receivers that I know of to be badged as a Radiola and a Radiolette.

There is also some confusion over naming conventions in the AORSMs - most of AWA's receivers are labelled Radiolas even though AWA used the Radiolette badge between 1924 and 1950.

It may not have mattered much to servicemen though it makes tracing the correct circuit in the 21st Century much harder than it needs to be, especially to those who were born toward or after the end of the valve era.

If anyone does have the correct circuit diagram for the R92 fitted with a 6X5GT rectifier, I would be grateful if they could e-mail a copy to me for publication.

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A valve a day keeps the transistor away...

I do beleive that Diagram to suit 609 Model from 1946 will do?

The only reference to 609 I have is model 609T which is a 7 valve dual band model.

As I said in the original thread on this question, the 500M of 1946 has a similar valve line-up to the one you gave (6A8G, 6G8G, 6V6G, 6X5GT).

I see in the notes accompanying the 500M schematic that it is stated: "5Y3GT rectifier was used in some receivers", so perhaps the 500M is close to, if not exactly, your set.

If you "unhide" your email address in your member profile, I'll send you what I have on the 500M.

Not quite, the 500M doesn't have tone control, whereas this receiver does, although it is probable that the rest of the circuit is similar.

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A valve a day keeps the transistor away...

Brad & GTC.
Brad I have sent you a E Mail, attached is the lable inside your Radio, please note that your set states the power consumption is 60 Watts, mine is only 40 Watts? this may help. also I have to study how I can send pictures like yours. this may help also the "tone control" had 5 position contacts, 2 of these are not used. positions 1&5 has the .05MF 600 V. Cap.& 2&5 has the Cap & a resistor in series,these in turn go to the 6V6GT

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Johno

Not quite, the 500M doesn't have tone control, whereas this receiver does, although it is probable that the rest of the circuit is similar.

Yes, when I line them up side by side there are significant differences.

The R92 schematic that you published is a comparatively simple set, so tracing out what's there ought not be too difficult.

Johnshack: Apart from lack of a schematic, what in particular are you having difficulty with in your set?

The 6X5 has been known to short out, so you may want to install a fuse on the power transformer primary to protect it in case yours ever does short out. An inline wire fuse under the chassis should do it.

Set does not look overly complex. I would agree that the "Muds' can be a real pain, as a considerable number had lost, or never had markings on them and you could only guestamate their value by size.

The 6X5 on many AWA sets had 100 Ohm, half watt resistors in the plate circuit. They made good fusistors.

There would only be minor changes to the rest of the circuit (mainly HT) to accomodate the 6X5. Transformer would of course be different.

Do check resistors as you get rid of the Electrolytics & paper caps & renew.

Marc

Wa2ise. Thanks that's a great idea.Now to GTC,my problem is this: in this set it has 5 unmarked black Capacitors, 2 of these are faulty, because these Capacators are not marked, I cannot see how I can replace if I have no Info. apart from that I have no problems sorting out the rest. The Schematic would help me very much
Johno.

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Johno

^ Given the amount of searching that we have done, my guess is that a specific schematic for your particular (variant?) set won't be forthcoming anytime soon.

Comparing your under-chassis view with the R92 schematic that Brad published, how different are they, especially as concerns capacitors?

GTS
OK, it's looks like that I have to put a end to my asking questions about my Fisk Radiola, as i'm unable to get a Wiring Diagram of this set, anyway many thanks to you all who has tried to help me. By the way, i'm new to this Forum, so lets hope that when we meet again, I could be lucky. Wishing you all a "MERRY CHRISTMAS"
Johno.

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Johno

I wouldn't give up yet John. Two of the paper condensers in my receiver are on the stepped tone switch from memory and replacing them with the wrong value won't make anything go bang - they'll either muffle the sound too much or simply not have any effect.

Sometimes things just take a bit longer but I am sure something will come up soon. The R92 isn't a rare receiver in the overall scheme of things so a circuit diagram should be available from somewhere.

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A valve a day keeps the transistor away...

^ Ditto on not giving up. My guess is that the R92 schematic that Brad published won't be too far off the mark compared with your set.

Again, when you compare your under-chassis view with that R92 schematic, how different are they, especially as concerns capacitors?