Hey Y'all how are you doing? Im only new on here and i have minimal knowledge on electronics but i have some knowledge. So ive just got a kriesler model 11-102 and it is a beautiful machine. I knew when i got it it had minimal sound out of the right speaker. Anyway first thing i did was test it and the sound from the right side is minimal on both the T/T and the radio. I went and replaced the cartridge and stylus on the Garrard 60mark2. still the sound is minimal. The left side has full sound. The volume seems to work okay as the left goes loud as and the right does go louder but no where near what it should be doing. so any thoughts? it may just be something simple. ive checked speaker wiring loom, all valves are nice and orange. speaker transformers arent hot. what do you guys reckon?
The first thing I would do would be to swap tubes between the channels to see if the problem follows the tubes, or stays with the right channel. If the trouble moves to the left channel, then simply replacing tubes might fix the problem. If not, you will need to do some basic troubleshooting and for that you will need a schematic.
KevinChant.com is a good source for this kind of vintage gear and the site does have a schematic for this model. You can find it here:
https://www.kevinchant.com/uploads/7/1/0/8/7108231/11-102_11-103.pdf
Maybe this will get you started.
KevinChant.com is a good source for this kind of vintage gear and the site does have a schematic for this model. You can find it here:
https://www.kevinchant.com/uploads/7/1/0/8/7108231/11-102_11-103.pdf
Maybe this will get you started.
hey Ray thanks for your thoughts on this. I decided to remove the chassis and found a couple of issues. in the right side near the speaker transformer i found a small capacitor blown. its a 32uf 64v.it was quite visible. This is a tough one to find but i believe a 33uf 100v will suffice. I also noticed some expansion on 2 other capacitors. both 16uf 300v. Once again its a tough one to find so i think a 16uf 475v will do the trick. The expansion on these two is enough to see the wrapper has torn due to expansion. They are both quite obese.
The faulty right channel can't be caused by the 2 x 16uF, since they are part of the power supply which is common for both channels. But changing them for fresh ones is still a good idea.
Where is the capacitor of 32uF situated in the schematic? There is no 32uF capacitor in the parts list. Is it C24b at the cathodes of the two 6GW8's of the right channel?
Where is the capacitor of 32uF situated in the schematic? There is no 32uF capacitor in the parts list. Is it C24b at the cathodes of the two 6GW8's of the right channel?
Although im not super on schematics it may be. There is a small capacitor, yes near the cathodes. Its 32uf 64v. one on the right and one on the left. The two 16uf are swollen and therefore i will replace and i understand they are not to do with sound. Since i have now had a good look there is also a resistor with a crack also near the capacitor that i will also replace.Not sure in regards to the parts list and i guess im just replacing what is in there. even though this unit says its a 11-102 the chassis came out like a 11-103. maybe that has something to do with it. thanks PCLl200.
I did not say that the 2 x 16 uF have nothing to do with sound. What I meant is that the 2 x 16 uF can't be the cause of the silent right channel because if they would be the cause, than the left channel would also have to be silent.
The schematic Ray linked to is for both the 11-102 and 11-103. But it is not uncommon that manufacturers make minor changes in running models.
The schematic Ray linked to is for both the 11-102 and 11-103. But it is not uncommon that manufacturers make minor changes in running models.
Thanks for that PCL200. You have a great deal of knowledge and i think i may have miss read what you said, and i believe i understand that now. So i had a good look at the schematics and then before i did any repairs swapped over the valves like you said and the issue did not follow so i went ahead and swapped out the bad resistor 32uf 64v and the two 16uf 300v as well. After this it made no difference at all. Realising that the 32uf 64v was blown. The end was completely blown out. So im thinking the issue may lay deeper. There is a small hum on the left speaker when i put the balance to left and turn up volume.I should just remind that there is sound its just very minimal and i guess muffled. I can certainly hear the difference between both sides when i use the balance. Just a question here mate is it the right speaker? Should i class it as the right from the front of unit or is the schematic looking from the rear of the unit? You have my respect mate!
Did you allready try what Ray advised? So swapping the two 6GW8's from the left channel to the right channel (and visa verca)?
If your problem than 'moves' from the right to the left channel, you can be pretty sure that one ore both of the 6GW8's that now sit in the right channel are at their end (maybe caused by the failed cathode capacitor).
If the problem doesn not 'move' with the swapping of the 6GW8's, I advise you to switch off right away and swap them back again, so you don't risk stressing the good/better 6GW8's if the problem is caused by something else than the 6GW8's.
If your problem than 'moves' from the right to the left channel, you can be pretty sure that one ore both of the 6GW8's that now sit in the right channel are at their end (maybe caused by the failed cathode capacitor).
If the problem doesn not 'move' with the swapping of the 6GW8's, I advise you to switch off right away and swap them back again, so you don't risk stressing the good/better 6GW8's if the problem is caused by something else than the 6GW8's.
Yes i swapped them out. The issue still stayed on the same channel. Im starting to think that maybe it could be the speaker transformer. What about the 12ax7 valve. Could this be an issue? Im not trying to jump ahead here. All the components in the unit seem to be in good order. Except for something. Because im not realy good at using a multimeter ive shied away from it. I think thats what i need to do. will let you know the outcome. cheers.
Keeping 1 hand in a pocket, while making multi-meter observations in tube equipment, is mandatory. Use an "alligator" clip or hooked probe to make the "ground" connection. Tube equipment contains potentially lethal voltages. Placing both hands into energized tube equipment can get you very dead. 🙁 It has happened all too often.
"What about the 12ax7 valve. Could this be an issue?"
Yes, it could be.
You could try this: Temporarily make a connection between the two outer contacts of the balance pot. In this way you will be sure that both the left and right channel from the balance pot going, will see the same input voltage. If the problem in the right channel than remains, the fault must be somewhere downstream the balance pot. When doing this, I expect the good left channel to have a little bit less volume than without this temporarily connection. But again: What you want to hear with this temporarily connection is that both channels play roughly at the same volume.
And like Eli said: Please be carefull!
Yes, it could be.
You could try this: Temporarily make a connection between the two outer contacts of the balance pot. In this way you will be sure that both the left and right channel from the balance pot going, will see the same input voltage. If the problem in the right channel than remains, the fault must be somewhere downstream the balance pot. When doing this, I expect the good left channel to have a little bit less volume than without this temporarily connection. But again: What you want to hear with this temporarily connection is that both channels play roughly at the same volume.
And like Eli said: Please be carefull!
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