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 The 80 rectifier valve cathode connection.
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 Return to top of page · Post #: 1 · Written at 5:41:39 PM on 7 August 2020.
Jimb's Gravatar
 Location: Kanahooka, NSW
 Member since 18 November 2016
 Member #: 2012
 Postcount: 660

I am not sure which pin is the cathode looked in several data books . Pins 1 and 2 filiament. Does it matter if I use pin 1 or pin 2.
I will be using pin 1 as cathode . Thoughts please. It is a differnt ball game building a radio to repairing one.
Regards Jim.


 
 Return to top of page · Post #: 2 · Written at 5:49:10 PM on 7 August 2020.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6013

Shouldn't matter which side of the filament you use.


 
 Return to top of page · Post #: 3 · Written at 5:54:56 PM on 7 August 2020.
Jimb's Gravatar
 Location: Kanahooka, NSW
 Member since 18 November 2016
 Member #: 2012
 Postcount: 660

Thanks GTC.


 
 Return to top of page · Post #: 4 · Written at 8:33:10 PM on 7 August 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4346

Similar rules to 5Y3 apply re not running it sideways unless.....https://frank.pocnet.net/sheets/029/8/80.pdf

#80 has no individual cathode. The filament is the cathode and must "float" above ground in this case.

Marc


 
 Return to top of page · Post #: 5 · Written at 9:29:12 PM on 7 August 2020.
Jimb's Gravatar
 Location: Kanahooka, NSW
 Member since 18 November 2016
 Member #: 2012
 Postcount: 660

Thank you Marc.


 
 Return to top of page · Post #: 6 · Written at 10:13:48 AM on 8 August 2020.
Trobbins's avatar
 Location: Melbourne, VIC
 Member since 11 July 2012
 Member #: 1179
 Postcount: 42

For suppressed ripple level in capacitor input filters, a heater winding with CT is deployed - the CT is linked to the first filter cap.


 
 Return to top of page · Post #: 7 · Written at 11:41:30 AM on 8 August 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4346

That will only work with heater tubes not a filament tube like #80 used in this set. One would have to modify.


 
 Return to top of page · Post #: 8 · Written at 5:10:50 PM on 8 August 2020.
Trobbins's avatar
 Location: Melbourne, VIC
 Member since 11 July 2012
 Member #: 1179
 Postcount: 42

My comment was that, in general, if you had a 5V heater winding with a CT, then best to connect the heater to the 80 rectifier filament, and the CT to the first filter cap. If the heater winding doesn't have a CT then, as indicated, just connect filter cap to one side of 80 filament.


 
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