Hi fella's new to this forum, and while I had a troll through the archives could not find a link to my problem.
I have a Kriesler 11-7 (1949) in excellent condition (picked up for $60) however when tuned to a station when the volume is very low sound is ok but the louder the volume the more the sound becomes distortedand unbearable. I tried a different working speaker and had the same problem. I am greatfull to any suggestions.
Thankyou Chanoo

What has, or has not been done to it, since you got it..

The internals may need a refit?

Marc

I'd say that unless this radio has been fully serviced with capacitors replaced, alignment of the tuned circuit carried out and verification that all the valves are working then all this would need to be carried out.

Just to make you aware, it is recommended that these checks be done before powering up an old radio. A well-made valve will last for umpteen decades but the passive components like capacitors and resistors are routinely failure-prone after more than half a century of service.

Rough guess: bad capacitor(s) and/or bad 6M5 valve.

A set that old ought to be re-capped and its resistors checked, too.

Problem could be caused by other parts, but a re-capping usually works wonders.

Worst case would be a dud output transformer.

Hi marc and Brad
nothing has been done, the bloke I brought it off had it for about 30 years, dont know what he did to it maybe nothing. I gather that unfortuantly for me here is not a simple fix. The method of fixing the problem may at this stage be beyond my current abilities, Is there anyone out there that knows of or can recommend someone in my area. I'm located on the Sunshine Coast Queensland
Thanks Chanoo

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The speaker may have deteriorated with age,silver fish, & various other disasters, however, having refitted a few of those the actual fix is quite srtraight forward.

Normally with Krieslers there are only two states with output transformers, as they love chewing them up. And that is either alive or dead.

Marc

I think he's acquitted the existing speaker when he wrote:

I tried a different working speaker and had the same problem.

Replace all the wax paper capacitors. They only last about 35 years and they stopped making them about 50 years ago, so any today are guarenteed to be bad (used or not, moisture from the air gets in and makes them electrically leaky). Change one at a time, that is, remove just one and replace it with a new modern cap of the same capacitence (being off 20% is okay) and same or higher voltage rating. That way, you are less likely to forget where it connects to in the radio. See my page
Repair tips for more info. Don't change the silve mica or ceramic caps unless you can tell that one is defective, but they are usually good.

Check the value of resistors with an ohmmmeter, high resistance resistors tend to increase in ohmage. Don't worrk too much about resistors that read low, something may be in parallel electronically with it.

Do all of this with the power cord disconnected!

Thanks fellas there is a wealth of information in all the replies, it certaintly gives me direction in what the issue may be. I will let you know the outcome when its got that sweet sound again
Cheers Chanoo

Hi there chanoo I live on the sunshinecoast in eumundi if you like I can take a look at it click on my profile and send me an email with your contact details cheers