Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: teletaylor on April 03, 2022, 01:34:08 pm
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Hello!
I’m having volume issues, as in very low with max volume. After double checking all values and wiring, and tubes, I’ve noticed that the 2.7 K resistor, measure 47ohms when placed in the circuit.
(https://i.postimg.cc/QC0D4wbn/B98-B687-D-707-E-47-D2-9-DF6-53-ADBE1-A6-C58.jpg)
(https://i.postimg.cc/C5FY4Sjq/3121792-E-3899-46-D6-97-BC-EB3-E24-C0-A6-B3.jpg)
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Hello!
I’m having volume issues, as in very low with max volume. After double checking all values and wiring, and tubes, I’ve noticed that the 2.7 K resistor, measure 47ohms when placed in the circuit.
That's exactly what it should read in circuit.
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Awesome, thank you, I’ll have to check other issues for volume
Thanks again!
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Might check on your soldering joints on your turret tops, some look a little rough....
Looks like quite a bit of spatter around the board maybe iron is a little warm?
Make sure you have a good connection to pin 7 of your PI side of the tube..
Not criticizing you at all, had all the above mentioned problems on builds before.
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...measure 47ohms when placed in the circuit.
No, it shows 46 Ohms.
Is there anything like a 46 Ohm resistor in here? Yes, a 47, and it is connected to the 2,700 Ohm you are asking about. And if you trace through the 2,700 and the few Ohms of the OT secondary, the 47 is in parallel with the 2,700 and OT (say 2,701 Ohms).
Parallel resistors: 2701||47 makes 46.2 Ohms. But if the 47 is a 5% part it could be 43.9 to 48.5. So your "46.0" is perfectly reasonable.