Hello all.I just got my first late 1920's early 1930's highboy.It is a Canadian Deforest-Crosley .I can't find the model number.It is sort of a mini highboy with a single ended 45 output and 3 24A's.The thing is someone at some time changed the #45 to a #47 socket and all.It says 45 on the transformer can.Why would this have been done.Could you get more power from the 47 (screen grid).Would this be hard on the #47 because the load impedance is different than a 45 or could the screen grid not be connected?I would like to put it back to original design when I overhaul(change capacitors etc.)Any info would be appreciated.Thanks

Chris. Heres one reason that comes to mind why someone would change socket so they ould use 47 instead 45 tube.. Its what they had on hand. Like needing a good 45 but not have it but plenty of 47 type. I have done that lately myself so as not to invest too much in a radio I was going to sell anyway.

Some time in the past someone may have done that to make the radio performance better. Or may have thought so.
A lot of old radios have had many owners, and have been modified in one way or another. Sometimes it's a make do with the parts they had on hand. It would be up to you if the past work done was a good idea or not. Makes this hobby a little more interesting.

:Some time in the past someone may have done that to make the radio performance better. Or may have thought so.
:A lot of old radios have had many owners, and have been modified in one way or another. Sometimes it's a make do with the parts they had on hand. It would be up to you if the past work done was a good idea or not. Makes this hobby a little more interesting. Thankyou both for the information!