Re: The Tasmanian Devil VCR139....A for Andrew
Posted: Mon Jun 05, 2017 6:48 pm
Steve Anderson wrote:It's possible that the aluminium coating has been applied, often CRTs had a suffix to indicate a change in the basic design or manufacturing process. In this case it may mean the coating process has been implemented. i.e. the change from a VCR139 to a VCR139A. Other changes, usually to the focus anode to reduce focus current, often resulted in an A or B suffix.
Well thats Logical and very possible ...it just seemed to work better that all i have read ,i see no real problems working just like a little version of the last one .
Looking at the last photo above I would say that's about the limit for the focus and is about the best the tube could deliver. Compared to the earlier photos it's vastly improved.
Steve A.
I to am happy how it is at this size perhaps with a slight aspect ratio change i can see i could at least double the lines and 120 line possible it would just fit this side on this CRT may be its limit that Ok i could try some thing higher on another CRT gives me an excuse to make another one in the future .
I am still working on the board i posted up a post or so back soldered on a input jack so i can test what i have made i will plug it in to the computer play your reversing wav file and power it up tomorrow .