Help getting AD65 (Actually an AD75) up and running - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Station X · 30th May 2023, 3:17 pm

Groan! Thread title updated.

mister valve · 30th May 2023, 7:46 pm

Quote:

Originally Posted by Dick Glennon

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

Dick Glennon · 1st Jul 2023, 7:14 pm

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.

Kentode · 2nd Jul 2023, 11:29 am

What voltages are you seeing on the anode and screen of V3?

Dick Glennon · 3rd Jul 2023, 7:28 pm

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.

Kentode · 3rd Jul 2023, 8:53 pm

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.

Dick Glennon · 9th Jul 2023, 3:24 pm

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.

Kentode · 9th Jul 2023, 4:48 pm

Well done Dick!

30th May 2023, 3:17 pm	#21
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 20,464	Re: Help getting AD65 (Actually an AD75) up and running Groan! Thread title updated. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

1st Jul 2023, 7:14 pm	#23
Dick Glennon Hexode Join Date: Oct 2006 Location: Edenderry, Republic of Ireland. Posts: 423	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.

2nd Jul 2023, 11:29 am	#24
Kentode Octode Join Date: Mar 2015 Location: Yorkshire, England. Posts: 1,212	Re: AD 75 now working but volume low. What voltages are you seeing on the anode and screen of V3? __________________ Regards, Ken. BVWS member

3rd Jul 2023, 7:28 pm	#25
Dick Glennon Hexode Join Date: Oct 2006 Location: Edenderry, Republic of Ireland. Posts: 423	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.

3rd Jul 2023, 8:53 pm	#26
Kentode Octode Join Date: Mar 2015 Location: Yorkshire, England. Posts: 1,212	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. __________________ Regards, Ken. BVWS member Last edited by Kentode; 3rd Jul 2023 at 9:16 pm. Reason: Additional.

9th Jul 2023, 3:24 pm	#27
Dick Glennon Hexode Join Date: Oct 2006 Location: Edenderry, Republic of Ireland. Posts: 423	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.

9th Jul 2023, 4:48 pm	#28
Kentode Octode Join Date: Mar 2015 Location: Yorkshire, England. Posts: 1,212	Re: Help getting AD65 (Actually an AD75) up and running Well done Dick! __________________ Regards, Ken. BVWS member