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Post by nickkenmare on Oct 6, 2021 21:22:26 GMT 12
Well I had a go at replacing the caps and a few resisters in the Drummond.
Well it goes, hmmm debatable.
Get noise from speaker.
Tubes running red hot.
I think I will get a pro to have a look at it.
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Post by Richard on Oct 7, 2021 9:52:47 GMT 12
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Post by nickkenmare on Oct 7, 2021 10:30:39 GMT 12
I'm not to sure what that means. I will check it out. I'm getting static from the speaker. One of the resistors starts to smoke. I will do a bit more research before I put in a new resister |
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Steve
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Post by Steve on Oct 7, 2021 13:00:38 GMT 12
I'd stop right there - if you've got a resistor smoking then there is a problem somewhere causing that and replacing it is unlikely to do anything other than let the smoke out of the new one as well, not to mention potentially letting the smoke out of other parts as well.
There are a few of us here in the Christchurch area that can do repairs on this kind of gear - I could take a look but I can't do it on any kind of timeline because I'm flat out busy with other stuff at the moment, so that could work if you're not in a hurry - someone else with a bit more free time might chime in though.
Cheers, Steve
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Post by Richard on Oct 7, 2021 15:03:56 GMT 12
yes, if resistors are burning up ,then there is something drastically wrong.
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Post by nickkenmare on Oct 7, 2021 16:39:39 GMT 12
I'd stop right there - if you've got a resistor smoking then there is a problem somewhere causing that and replacing it is unlikely to do anything other than let the smoke out of the new one as well, not to mention potentially letting the smoke out of other parts as well. There are a few of us here in the Christchurch area that can do repairs on this kind of gear - I could take a look but I can't do it on any kind of timeline because I'm flat out busy with other stuff at the moment, so that could work if you're not in a hurry - someone else with a bit more free time might chime in though. Cheers, Steve yeap im just gona leave it alone, iv gone back through the plans. double checked all the replacements. will have to wait until some one pro can have a look. there no rush, its not urgent. |
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Post by Peter Walsham on Oct 7, 2021 20:35:02 GMT 12
Have you replaced the filter capacitors, by any chance?
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Post by nickkenmare on Oct 7, 2021 20:55:55 GMT 12
Have you replaced the filter capacitors, by any chance? Nup didn't change those. I need to be careful changing those. If I get those around the wrong way I will be in trouble. |
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Post by Richard on Oct 8, 2021 7:48:38 GMT 12
The filter caps could be leaky and so drawing extra current, which could be your problem?
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Post by nickkenmare on Oct 8, 2021 8:36:22 GMT 12
The filter caps could be leaky and so drawing extra current, which could be your problem? Yea maybe. I will leave it alone. Last thing I want to do is damage the whole unit. Here a picture of what I replaced and the red is the problem  |
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Steve
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Post by Steve on Oct 8, 2021 8:45:31 GMT 12
Flick me an email - nzvintageradios at gmail.com if you like - you can drop it out and I can have a look - It might be an interesting problem to do a youtube video on... And if we can make a time where I have a spare hour or so I could walk through the circuit and radio with you and look at what the problem might be if these old radios are something you feel like you want to work on more.
Actually, the Canterbury Vintage Radio group meets tonight (1st Thursday of each month, covid willing) at Branch 05 - the HAM clubrooms at 5 Idris Rd at 7 or 7.30 - I should know, but I can never remember... if you're interested then you're welcome to come along - and if you bring it with you I can take it with me from there.
If you'd just like it fixed, then either bring it out (I'm in Sefton), or I can meet you at the clubrooms and grab it from there...
Cheers, Steve
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Steve
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Post by Steve on Oct 8, 2021 8:49:39 GMT 12
Its hard to tell, but does that (10k?) resistor run (effectively) from the HT supply to ground? That would make smoke...
Also: you should avoid using 1/4 resistors in old radios as they don't have a high enough voltage rating for many parts of the circuitry - stick to 1W resistors minimum
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Steve
Society Members
vintageradio.co.nz
Posts: 732
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Post by Steve on Oct 8, 2021 15:20:48 GMT 12
Turns out I have spent the week 1 day out of sync with the rest of the world - my darling wife has just had an argument with me about what day it is... she was right... as usual. So there is no meeting tonight, it was last night and I missed it  Don't turn up at the clubrooms (like I was planning to do)... |
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Post by nickkenmare on Oct 8, 2021 18:53:47 GMT 12
Flick me an email - nzvintageradios at gmail.com if you like - you can drop it out and I can have a look - It might be an interesting problem to do a youtube video on... And if we can make a time where I have a spare hour or so I could walk through the circuit and radio with you and look at what the problem might be if these old radios are something you feel like you want to work on more. Actually, the Canterbury Vintage Radio group meets tonight (1st Thursday of each month, covid willing) at Branch 05 - the HAM clubrooms at 5 Idris Rd at 7 or 7.30 - I should know, but I can never remember... if you're interested then you're welcome to come along - and if you bring it with you I can take it with me from there. If you'd just like it fixed, then either bring it out (I'm in Sefton), or I can meet you at the clubrooms and grab it from there... Cheers, Steve Gidday. thats good i am in Rangiora. i didnt have the petrol to head into town. yeap i would like to go through the circuit to see whats happening. I also have a clipper that i would like to have a look at. that 10k resister is going from HT to ground. |
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