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Old 30th May 2023, 3:17 pm   #21
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Default Re: Help getting AD65 (Actually an AD75) up and running

Groan! Thread title updated.
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Old 30th May 2023, 7:46 pm   #22
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Default Re: Help getting AD 65 up and running

Quote:
Originally Posted by Dick Glennon View Post
Hi again, I have already replaced the electrolytic caps and all other caps (paper). In the trader sheet 748 the rectifier is stated as CY31 in the Ekco AD75. Hope this information helps.

Dick
My post was about the "AD65" model....

The "AD75" does, of course, use the later 'CY31' rectifier valve
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Old 1st Jul 2023, 7:14 pm   #23
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Default 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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Old 2nd Jul 2023, 11:29 am   #24
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Default Re: AD 75 now working but volume low.

What voltages are you seeing on the anode and screen of V3?
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Old 3rd Jul 2023, 7:28 pm   #25
Dick Glennon
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Default 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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Old 3rd Jul 2023, 8:53 pm   #26
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Default 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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Last edited by Kentode; 3rd Jul 2023 at 9:16 pm. Reason: Additional.
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Old 9th Jul 2023, 3:24 pm   #27
Dick Glennon
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Default 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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Old 9th Jul 2023, 4:48 pm   #28
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Default Re: Help getting AD65 (Actually an AD75) up and running

Well done Dick!
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