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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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30th May 2023, 3:17 pm | #21 |
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Re: Help getting AD65 (Actually an AD75) up and running
Groan! Thread title updated.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
30th May 2023, 7:46 pm | #22 | |
Hexode
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Re: Help getting AD 65 up and running
Quote:
The "AD75" does, of course, use the later 'CY31' rectifier valve
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1st Jul 2023, 7:14 pm | #23 |
Hexode
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AD 75 now working but volume low.
Hi again, I now have the AD 75 working but the volume is low but not distorted. Any advice would be very much appreciated. Regards, Dick.
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2nd Jul 2023, 11:29 am | #24 |
Octode
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Re: AD 75 now working but volume low.
What voltages are you seeing on the anode and screen of V3?
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3rd Jul 2023, 7:28 pm | #25 |
Hexode
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Re: Help getting AD65 (Actually an AD75) up and running
Hi again, The voltage on the anode of CBL 31 (pin 3) is 254 volts, and the screen(pin6) is 260 volts. Hoping the pins are correct. Mains voltage is 235 volts. Hope this is helpful. Dick.
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3rd Jul 2023, 8:53 pm | #26 |
Octode
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Re: Help getting AD65 (Actually an AD75) up and running
They're not too far off, assuming you're on 240 volts and using a dmm. If the other valves are similar to the service sheet and you've got a good aerial check the speaker, it might be seized by rust.
Have you got a signal generator? Actually, the screen voltage could be a tad higher.
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Regards, Ken. BVWS member Last edited by Kentode; 3rd Jul 2023 at 9:16 pm. Reason: Additional. |
9th Jul 2023, 3:24 pm | #27 |
Hexode
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Re: Help getting AD65 (Actually an AD75) up and running
Hi again, just to let ye know that my AD75 is now working very well. I replaced the EF89 and that brought up the volume to very acceptable levels. Thanks again for all your help. Dick.
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9th Jul 2023, 4:48 pm | #28 |
Octode
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Re: Help getting AD65 (Actually an AD75) up and running
Well done Dick!
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Regards, Ken. BVWS member |