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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
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17th May 2021, 1:59 pm | #41 |
Dekatron
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Re: Grundig tk 24
With Playback selected and no signal input measure the resistance between the input to c13 (junction of D1 and D4) and chassis.
Lawrence. |
17th May 2021, 3:06 pm | #42 | |
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Re: Grundig tk 24
Quote:
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17th May 2021, 3:57 pm | #43 |
Triode
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Re: Grundig tk 24
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17th May 2021, 4:02 pm | #44 | ||
Triode
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Re: Grundig tk 24
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17th May 2021, 4:06 pm | #45 | |
Dekatron
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Re: Grundig tk 24
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Lawrence. |
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17th May 2021, 4:18 pm | #46 | ||
Triode
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Re: Grundig tk 24
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17th May 2021, 4:24 pm | #47 | ||
Triode
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Re: Grundig tk 24
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17th May 2021, 5:32 pm | #48 |
Dekatron
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Re: Grundig tk 24
Next test, measure the resistance between connection 1 and connection 4 of the head as per the schematic with the Track switch set to D, the function selector can be set to Stop for that test but before that test can you confirm if relay W is being energized when the function switch is set to Playback.
Lawrence. Last edited by ms660; 17th May 2021 at 5:44 pm. Reason: extra info |
17th May 2021, 5:57 pm | #49 |
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Re: Grundig tk 24
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17th May 2021, 11:16 pm | #50 | |
Triode
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Re: Grundig tk 24
Quote:
Krishna |
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18th May 2021, 12:44 am | #51 | |
Triode
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Re: Grundig tk 24
Quote:
please run attached video I think it will make easy to understand my issue https://youtu.be/tPec0Seoowg Regards Krishna |
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18th May 2021, 10:27 am | #52 |
Dekatron
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Re: Grundig tk 24
In the video are you saying that you've disconnect C13 from the head circuit and you are feeding a signal to the input side of C13 and that when in record the sound is good but when switched to playback the sound is weak?
Lawrence. |
18th May 2021, 10:47 am | #53 |
Triode
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Re: Grundig tk 24
Yes sir i could not under stand the issue audio amplifier is good no issue but why in playback audio is too low
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18th May 2021, 10:55 am | #54 | |
Dekatron
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Re: Grundig tk 24
Quote:
Lawrence. |
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18th May 2021, 12:27 pm | #55 | ||
Triode
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Re: Grundig tk 24
Quote:
Krishna |
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18th May 2021, 12:53 pm | #56 |
Dekatron
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Re: Grundig tk 24
The problem is that I don't fully understand what it is you're doing but at the moment I'm thinking that you have disconnected the head input circuit to C13 and replaced that input with a signal from your BT unit and that in record it sounds good and in playback it sounds weak?
If that's the case then the only part of the amplifier circuit that should alter when changing from record to playback is the feedback circuit between the two triodes, that's switched by relay contact W1, in playback the different components that are switched in are C10, R6 and R9, it might be worth checking C10 for leakage. That's assuming that contacts B1 or B2 are not in the closed position due to whatever reason when playback is selected. Lawrence. |
18th May 2021, 1:14 pm | #57 | |
Triode
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Re: Grundig tk 24
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18th May 2021, 1:21 pm | #58 |
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Re: Grundig tk 24
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18th May 2021, 4:58 pm | #59 | ||
Triode
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Re: Grundig tk 24
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Regards Krishna |
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18th May 2021, 5:29 pm | #60 |
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Re: Grundig tk 24
When the anode voltages are low what's the voltage measurements between pin 7 and ground and pin 8 and ground?
Lawrence. |