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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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1st Aug 2009, 8:08 pm | #1 |
Octode
Join Date: Apr 2005
Location: Peterborough, Cambridgeshire, UK.
Posts: 1,897
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EKCO AD65 Disaster. valve question
Hi all
I am repairing the Ekco AD65 (which is in the cabinet refinishing section of the forum) I have turned my attention to the chassis for the moment and after sorting out the bent tuning drive I am looking forward to powering up the chassis, unfortunately when the damage occured the output valve was smashed. The original valve was a PEN4020, I have had a look through my valves and the nearest I can find is a AC5 PEN DD The main difference between the two valves that I can see is that the 4020 has a 40 volt heater and the Ac5 has a 4 volt heater, my quetion is can I sub the valve if I modify the heater supply or are there other differences that I have overlooked? Many thanks Rich.
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1st Aug 2009, 10:26 pm | #2 |
Octode
Join Date: Mar 2006
Location: Watford, Hertfordshire, UK.
Posts: 1,270
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Re: EKCO AD65 Disaster. valve question
Hi Rich, I believe the heaters are wired in series and all have a heater current of 0.2A. The AC5 PEN will not go here at all. I think a request to the wireless museum may be of benefit though if you can reverse the wiring to pins 2 and 6 you may be able to use a PEN40DD but its voltage ratings appear to be slightly less than the PENDD4020.
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1st Aug 2009, 11:07 pm | #3 |
Octode
Join Date: Jul 2005
Location: Newport, Gwent, UK.
Posts: 1,623
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Re: EKCO AD65 Disaster. valve question
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2nd Aug 2009, 4:33 pm | #4 |
Octode
Join Date: Apr 2005
Location: Peterborough, Cambridgeshire, UK.
Posts: 1,897
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Re: EKCO AD65 Disaster. valve question
Thanks both for the information.
I have managed to buy one from colomor ( via e-bay) for £16.50 inc p and p. I did get the radio for nothing so I can't complain ! Rich. Mods: This thread can now be closed, Thanks.
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