Was wondering if there is a plate current adjustment for this radio Put in fresh el84 tubes and while keyed down plate current drops I know the plate current is supposed to be set at 60ma im seeing about 20 at best put in brand new tubes any help appreciated
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Dak Mark IX Help
- Thread starter siltronix_man
- Start date
What does your wattmeter indicate for the deadkey?
I would use an ohm meter and check resistors r711 = 10 ohm, r708 = 10 ohm, r706 = 4.7k ohm, and r709 = 180 ohm.
Any of these resistors being off value significantly could cause this problem.
Additionally, the following from the service manual:
Located behind the P.C. board containing the VACCUM tubes is a shielded can containing the final R.F. amplifler tank circuit. There are two variable capacitors are mounted on top of tank coil. Peak these for maximum output. These capacitors interact so it will be necessary to adjust and readjust until maximum reading is obtained on R.F. output meter.
I would use an ohm meter and check resistors r711 = 10 ohm, r708 = 10 ohm, r706 = 4.7k ohm, and r709 = 180 ohm.
Any of these resistors being off value significantly could cause this problem.
Additionally, the following from the service manual:
Located behind the P.C. board containing the VACCUM tubes is a shielded can containing the final R.F. amplifler tank circuit. There are two variable capacitors are mounted on top of tank coil. Peak these for maximum output. These capacitors interact so it will be necessary to adjust and readjust until maximum reading is obtained on R.F. output meter.
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