Circuit emailed: 10k would likely go to antenna coil and 200 Ohm to the cathodes. Refer circuit. 110 Ohm is not a common value to me.

Check for a heater cathode short for Rk to burn.

Marc

R 30TS Circuit Diagram

I didn't get the email. I checked trash and spam as well but no. Strangely enough since that photo was taken the orange dot has disappeared and the resistor seems to have burnt some more though I smelt nothing burning.

File uploaded to Post 46.

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A valve a day keeps the transistor away...

Measure the voltage across that resistor. Apart from Rk burning via a heater cathode short; In that bias system it is one great big voltage divider and the potentiometer working as a volume, quite often places more positive on the cathodes from B+ by adding resistance to the dividers earth leg.

Marc

Received with thanks.

Hi Marcc . In my research over the last few weeks with the HRSA schematic service they came up with a schematic from Weldon as the closest to my EMMCO. I was lucky enough to purchase AORSM no 2 ( 1938 ) I looked up Weldon and found that their 3/38 has exactly the same components as my EMMCO down to the 10K pots. I am learning how to read these schematics and just wondering if you might be able to have a look and if there is any advice you may be able to think of for me. . The EMMCO is a Superhet as is the Weldon Your advice has been of great help to me .

Well Guys I was quite happy with the progress of this unit knowing that I had not changed the circuit ( put wires in the wrong place ) . As I had no way of testing the valves I thought the best thing was to take it to my tech and ask him to do that. He did a few quick checks and found that one of the pots that had been given to me was OC. As he changed the pot he uttered famous last words " I doubt if this will work tonight as I think it may have numerous problems " then he powered it up and hey presto it sprung to life after 50 years dormant . It was actually running well under 240 volts as it was sitting on about 160 on the variac. I Had done a recap but no resistors had been changed . That will happen though He has kept it and is doing a final tune for me and I will be putting it all back together yaay.

I would have liked to have tested the resistors first before alignment, I normally do that as I change the caps as they can bring down a set and rework always comes with risk. The least amount of work you do the lesser is the risk of breaking something.

In other words, the ultimate objective is to get it right in the first pass. Changing parts in the RF can throw things off frequency.

If he thinks it is right, (knows valve radio,) & its working, its not broke: Remove fingers & do not re-apply.

Yeah he is a old radio Guy . Yeah he cut his teeth on valves . I am a very lucky guy to know him. He lives just around the corner from me and has always said to me that I am welcome to come around at any time. He honestly was not confident that it was going to work straight up but what a pleasant surprise.

I am just about to finish this old Girl. I thought I might send some pics of the chassis clean up. I achieved this by just using white vinegar, a toothbrush , some wet and dry and a little metal polish. Not real bad.
EMMCO never used cadmium , They were just plain high quality steel. For 82 years its come up pretty good.
I have sent Brad some photos and will send one more when finished.

Well guys here is the finished article. The woodwork is original untouched (except beeswax) 1934 as it came out of the factory.

With the risk of getting a smack on the wrist it turned out that all the original resistors tested ok and I did not really see the need to change them (nor did the tech) this old girl has a beautiful tone to which I am quite astounded.

I think that resistors can simply just be replaced when they fall out of tolerance. I rarely replace any and when I do it is a last resort. Capacitors are a different story though - electros and papers and the infamous AWA blackies are just replaced, no matter what.

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A valve a day keeps the transistor away...

I am guessing that resistors don't go off with age but rather with use or abuse. I get the impression the radio didn't get much use but did get a bit of abuse.

Ive lost count of how many 1meg resistors Ive replaced over the years. Its easier to check them while caps are unsoldered.

Ben

There is a pattern and I keep stocks as I repair. The greatest stock I carry is 47k & 470k, 100k and 5-10 of everything else other than some common WW and 2 & 3 Watt. I mainly stock 1 Watt en mass.

The grid resistors of 6V6 and family have an attrition rate as do plate resistors on some det/audio valves and tuning indicator 1Meg. that 1Meg is rarely good.

Often found in HMV but not exclusively in the mid to late fifties are some where all of them fail. Some "Little Nippers: Had 2x 22k 1W parallel replaced with a single 10k on the screens. That new arrangement sees the 10k having to handle more than 1 Watt so it fails.